Fission: Question 23. Various types of fungi like yeasts and moulds which do not have chlorophyll are also included in this group. Sketch and label the figures of the following plants and explain them into brief. (2016 D) This occurs in a few species of all-female animals, and in females of some animal species when there are no males present to fertilize eggs. (b) What is regeneration in organisms? In these plants, after the process of reproduction, seeds are formed which contain the embryo and stored food. Two functions of testes are: Question 4. This article will tell you how. Use of copper-T device by the females in their uterus. Give one example of such organism. Question 6. Cryptogams and Phanerogams. After implantation, a disc like special tissue develops between the uterus wall and the embryo which is called placenta. (c) Gymnosperms, Question 16. This process is called implantation. It secretes seminal fluid which is alkaline and neutralises the acidity of urine and activates sperms. Cell division is a type of reproduction in unicellular organisms because many unicellular organisms split into two identical halves during cell division leading to the creation of new organisms. (v) Prostate gland: It is a single, large sized & lobulated gland present just below the urinary bladder. Strong and hard, Question 5. In the early spring, ferns should be transplanted just when the fiddleheads start to grow. This group of plants is called the amphibians of the plant kingdom. Avoid using commercial fertilizer on your newly planted Ferns. Examples: Moss (Funaria), Marchantia, Anthoceros, etc. (b) State one difference in their mode of reproduction. Diagram for regeneration in planaria. The plants whose seeds can be divided into equal parts are called Spores often use similar strategies to those of seeds. (2013 D, 2015 D) Advantages of vegetative reproduction in case of an orange plant: Question 5. (d) Aerenchyma Riccia: Question 4. Answer: Pterodactyl is not technically a dinosaur. This method, in which a cell simply copies its DNA and then splits in two, giving a copy of its DNA to each daughter cell, is used by bacteria and archaebacteria. This strategy would not work well for an organism that invests highly in the survival of individuals, such as multicellular organisms. (a) Do Organisms create exact copies of themselves? This large snake is so-named because it will puff up its body to appear bigger than it is when directly threatened by a predator or person. 1. (a) Bamboo Replant the Fern in the media you prepared earlier in the pot. 3. Vinegaroons can spray 19 times before the glands are depleted, Vipers are one of the most widespread groups of snakes and inhabit most. During . While linnets are monogamous during mating season, they do not mate for life. Mozambique Spitting Cobra is one of Africa's most dangerous snakes. Complete the sentences by filling in the blanks and explain those statements. There are many types of plant viruses, and some are asymptomatic or latent. and compare them. Plants grown by vegetative propagation grow much faster than those grown from seeds. The lesser jacana is nomadic, often moving in search of temporary wetland habitats. Answer: Gymnosperms bear male and female flowers on different sporophylls of the same plant. In nucellar embryony, an embryo is formed from a parents own tissue without meiosis or the use of reproductive cells. The structure of the plant body of bryophytes is flat, ribbon-like long, without true roots, stem and leaves. Angiosperms Most plant viruses have small, single-stranded RNA genomes. (b) Thallophyta 3. The potting mix you prepare for planting the Fern in a pot should contain equal parts of sand, gardening soil, and peat moss. These devices prevent the entry of sperm in the female genital tract, thus acting as a barrier between them. False spiders actually prey on black widow spiders and other hazardous spiders. Other contraceptive devices such as loop or the copper-T are placed in the uterus to prevent pregnancy. Difference between Fission and Fragmentation Answer: Question 2. Answer: (b) Structure of placenta: Placenta is the link between the mothers body and the baby (embryo). Question 2. (11) False. (ii) blobs that develop at the tips of the non-reproductive threads in Rhizopus. How does it occur in plants? Strawberries are an example of plants that reproduce using runners, which grow outward from a parent plant and later become separate, independent plants. How are the modes for reproduction different in unicellular and multicellular organisms? In males, a small portion of the sperm duct (vas deferens) is blocked by surgical operation. During germination of the seed, the stored food is used for the initial growth of the embryo. (a) Monocotyledons Usually, one mature ovarian follicle develops into a mature ovum. Ulothrix, Ulva, Nephrolepis, Sargassum ", In this method of reproduction a protective wall is formed around the cell of a single celled organism like in plasmodium during unfavourable conditions. (2) Moss : Bryophyta : : Selaginella : Explain briefly. What are the characteristics of the above plants in terms of flowers? Depending upon whether seeds are enclosed in a fruit or not phanerogams are classified into gymnosperms and angiosperms. (c) Xenophyta The root systems of these types of plant are tap roots or fibrou roots. No mate is needed to found a new population. Examples. Browse through thousands of open-minded people: naked girls, guys, transsexuals and couples performing live sex shows. The Orange River is home to a number of endemic fish including the Numaquab barb, Maluti redfin, and Orange River mudfish. At the tip of the hyphae tiny blob like structures develop called sporangia which contain spores. The plants whose seeds cannot be divided into equal parts are called "text": "Transplanted Ferns do best if they are planted in the same soil and shade condition as where they come from. Answer: There are a few examples of plant diseases caused by protozoa (e.g., Phytomonas, a kinetoplastid). Fission, budding, spore formation and vegetative propagation are some of the types of asexual propagation. It is ideal to add mulch during every growing season so that the soil remains moist and the plant stays protected from weeds. (2015 OD) Possibly as a remnant of their sexually reproducing past, New Mexico whiptail lizards do have a mating behavior which they must go through to reproduce. They may be unicellular or multicellular, and microscopic or large. Unicellular organisms reproduce asexually whereas multicellular organisms reproduce manly by n 1 reproduction. Be careful with fiddleheads while you transplant your Fern as the new growth is delicate. You should only transplant Ferns that are grown on your property or inside your house." (a) Algae The flowers of Angiosperms plants bear are their reproductive orgAnswer: Flowers develop into fruits and seeds are formed within fruits. Question 1. Question 10. Dinocrucuta had very strong jaws capable of crushing bones. (2016 OD) For a nice price, the mynah bird makes a good pet. (14) True Write two examples each of sexually transmitted diseases caused by (i) virus, (ii) bacteria. Female teacup minis become sexually mature between 2 and 5 years old, but breeders typically wait until their horse is 3 before letting her reproduce to prevent complications. (3) Moss (Funaria) belongs to division bryophyta. What are the characteristics of the above plants in terms of seed? (a) How do Leishmania and Plasmodium reproduce? (d) Angiosperms They reproduce with the help of spores formed along the back or posterior surface of their leaves. With the help of suitable diagrams, explain the various steps of budding in Hydra. Some abiotic disorders can be confused with pathogen-induced disorders. The soft coat of the Coton de Tulear is the result of a singular genetic mutation early in the breed's development. To secrete female hormones estrogen and progesterone. Question 6. Answer: Transfer of female gamete (egg) from the ovary to the uterus takes place through the oviduct (or fallopian tube). Females are about four times the size of males. WebGet 247 customer support help when you place a homework help service order with us. Bacterial infections. Funaria and Marchantia (Bryophyta) They can survive for weeks without drinking water because the get moisture from their prey. [14] They are transmitted as durable zoospores that may be able to survive in a resting state in the soil for many years. These plants usually have a .. and fibre-like body. Question 22. These plants bear male and female flowers on different .. of the same plant .. of these plants do not have natural coverings, i.e. One of the most invasive species in the world. Bryophyta and Pteridophyta: Bacteria can afford to use this survival strategy because their extremely rapid reproduction makes harmful genetic mutations such as copying errors or horizontal gene transfer gone wrong inconsequential to the whole population. This breed doesn't usually make nests or incubate their own chicks. (c) Pteridophyta What are sexually transmitted diseases? (2014 D) Ferns, Question 2. Also give one example of each. (b) Thread like non-reproductive parts develop on the substrate (like bread) called hyphae. Flea beetles can jump like fleas when threatened. (b) How may the spread of such diseases be prevented? (a) Angiosperms, Question 7. It contains villi on the embryos side of the tissue. It contains villi on the embryos side of the tissue. Answer: How does reproduction help in providing stability to populations Of species? (i) Testis: Testis is the main reproduction organ of the male reproductive system. Functions of testes are: Structure and function: After fertilisation, zygote is formed which develops into an embryo. How does the embryo get nourishment inside the mothers body? Answer: Answer: (2) Fungi like yeasts and moulds are included in division bryophyta. (2013 D, 2013 OD) (6) Pteridophytes have well developed roots, stems and leaves. When the pollen grains from the anther of a flower on one plant are transferred to the stigma of a flower on another similar plant, it is called cross pollination. Generally boys attain puberty at the age of 13 to 14 years while girls reach puberty at the age of 10 to 12 years. Further, they can transmit plant viruses. What are the characteristics of the above plants in terms of root system? This process is known as fertilization. Answer: (2011 OD) (d) Monocotyledons, Question 20 While primitive in the sense of being the most labor-intensive solution by far, where practical or necessary it is more than adequate. Question 5. (a) Branches Solved the very best collection of How do Organisms Reproduce Class 10 Science Important Questions and Answers Chapter 8 Pdf from the latest NCERT edition books, It will help you in scoring more marks in CBSE Exams. The American robin is called the robin because its red breast reminded European settlers of the robin back in the old country. Four modes of asexual reproduction: Question 3. These are caused by species of Plasmodiophora and Spongospora, respectively. Now cut the large Fern into smaller sections, preferably halves, quarters, or one-thirds. The cells involved in sexual reproduction are called gametes. Most bacteria that are associated with plants are actually saprotrophic and do no harm to the plant itself. WebGametocytes - are the sexual forms of the parasite and are characterized by a crescent shape (banana-shape). (d) Banyan This group of plants is called the amphibians of the plant kingdom because they grow in moist soil but need water for reproduction. (b) Fungus WebStripchat is an 18+ LIVE sex & entertainment community. Necrotrophic fungal pathogens infect and kill host tissue and extract nutrients from the dead host cells. The offspring of a horse and donkey parents! First domesticated by the Ancient Egyptians! Explain its function in human female. Powderpost beetles prefer living in moist tree limbs, dead wood, and branches. The Carpet Viper probably bites and kills more people than any other species of snake. "acceptedAnswer": { What is multiple fission? Some cat snakes have a prehensile tail that helps them climb into trees. WebA berry is a small, pulpy, and often edible fruit.Typically, berries are juicy, rounded, brightly colored, sweet, sour or tart, and do not have a stone or pit, although many pips or seeds may be present. Freshwater eels are actually catadromous, meaning they migrate to saltwater to spawn, The freshwater jellyfish is native to China but is now found all over the world. Algae show great diversity. There are three main causes of human population explosion: The uncontrolled growth of human population causes many socio-economic problems. Their name means banana-eater, but they rarely ever eat bananas. Nymphs take 9 to 10 days on average to mature, with a complete lifespan of an estimated 30 days. Some organisms split off a small part of themselves to grow into a new organism. (b) Mention the role of gamete and zygote in sexually reproducing organisms. Simultaneous hermaphrodites can be regarded as both sexes present in the same individual. When a mature spirogyra filament attains considerable length, it breaks up into smaller fragments or pieces, and each fragment grows into a new filament or individual. Web(vii) If the ovum does not get fertilised even now, then the menstruation takes place again and this cycle goes on repeating. Define the term puberty. Their stems are without branches and the leaves form a crown. Answer: these plants do not form fruits and are therefore called gymnosperms (gmnos: naked, sperms: seeds). Question 16. Ferns are among the plants that do not flower. The anatomy of fern leaves can either be simple or highly divided. Oleander hawk moth caterpillars feed on the foliage of oleander, an extremely toxic plant to which they are immune. (a) Ulva We offer free revision as long as the client does not change the instructions that had been previously given. They grow in moist soil but need water for reproduction. Darren Watkins Jr. (born: January 21, 2005 (2005-01-21) [age 17]), better known online as IShowSpeed (or simply known as Speed, or Speedy), is an American gaming YouTuber, football athlete, hip-hop musician, and variety live-streamer, currently residing in Cincinnati, Ohio. Question 93. (d) Monocotyledons The leaves produce buds in Bryophyllum which are used for vegetative propagation. This zygote then grows and develops into a new organism in due course of time. New leaves typically expand by the unrolling in a tight spiral manner. Answer: Plant body is without specific parts like true roots, stem and leaves. (a) (i) Thread like non-reproductive structures present in Rhizopus is hyphae. Answer: It helps in replacing the lost section of the population due to death and various other causes. Question 20. are met from the mothers body. (a) The appearance of variations among the progeny formed by sexual reproduction is due to the following reasons: The AIDS disease also spreads through the transfusion of blood contaminated with AIDS virus. Dunkleosteus had a bite force strong enough to cut through pirey. In addition to these three elements, humans and time add the remaining elements to create a disease tetrahedron. Plants from this group have well developed roots, stem and leaves and separate tissues for conduction of food and water. Explain budding in Hydra with the help of diagrams only. Answer: The firefly produces some of the most efficient light in the world, Adult fleas can jump up to 7 inches in the air. In a series of leaps, this creature can cover almost 30 feet of distance in just a few seconds. Believed to be the inspiration for unicorn myths! They have a well-developed conducting system. Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration? The regeneration of an organism from its cut body part occurs by the process of growth and development. are mostly evergreen, perennial and woody. (d) Angiosperms Spitting cobras are types of cobras that can spit venom at predators and prey. You can find birds all over the continent. Write the importance of such reproduction in nature. Fortunately, most dangerous African animals can be safely seen in national parks and game reserves. Savanna goats have only existed since 1957. These act as a barrier to prevent pathogens from entering the plant host. Orange River: Flows 1,300 miles across South Africa and forms the boundary with Namibia. WebThe latest Lifestyle | Daily Life news, tips, opinion and advice from The Sydney Morning Herald covering life and relationships, beauty, fashion, health & wellbeing There are nearly 1,000 different species! The biscuit beetle form a symbiotic relationship with yeast. These shaggy snakes are only 2 feet long and mostly arboreal. What are these group of plants called in the plant kingdom? Question 5. Examples are ferns like Nephrolepis, Marsilea, Pteris, Adiantum, Equisetum, Selaginella, Lycopodium, etc. D. It is used only by single-celled organisms. They do not have specific .. for conduction of food and water. (6) True (2014 D) (2017 D) We earn from qualifying purchases. This plant come under Division III Phanerogams Division I Gymnosperms. Feeds on aquatic insects and water-spiders! Taking care of houseplants and gardening are my greatest passions. It takes place during normal life conditions. With an appropriate tail wind, the mallard can travel hundreds of miles a day, Some of the smallest and most brightly colored frogs in the world. [24] Although PCR can detect multiple molecular targets in a single solution there are limits. The spider ball python is known for having a head wobble. (2014 D) The parent organism splits to form two new organisms. Inhabits woodland and forest areas worldwide! The unfertilised ovum dies within a day and the uterus lining also breaks down. This butterfly determines the smell and taste of a flower with its feet. If a couple has less number of children they can provide good food, clothes and education to each child. Match the proper terms from columns A and C with the description in column B. The sperms formed in the testis are delivered through the vas deferens to urethra. Banana cinnamon ball pythons came from combining the banana and cinnamon genes. Leptocephali have flat bodies filled with jelly-like substances, surrounded by a thin layer of muscle. Females are typically 25% larger than males. Some organisms can perform both sexual and asexual reproduction. Another name for these fuzzy insects is "boogie-woogie aphids" because of their habit of lifting their posteriors and pulsing them in synchronized motions when threatened. Flowers with 4 or 5 parts or in their multiples (tetramerous or pentamerous), Question 3. Answer: (angiosperms, gymnosperms, spore, Bryophyta, thallophyta, zygote) The process of getting back a full organism from its body parts is called regeneration. Question 7. Question 1. Gymnosperms are mostly evergreen, perennial and woody. (4) Pteridophyta : Roots :: Bryophyta : 1. Answer: A promising example is the effectiveness of the nematode Steinernema rarium PAM25 against the Drosophila suzuki, a type of fruit fly.[13]. Question 5. Some of the most notable are the African Great Lakes, a system of 7 lakes in East, South, and Central Africa. Some of these are found in freshwater while some are found in saline water. Answer: The offspring of a Zebra and Horse parents! They reproduce by spore formation. Dicots: beans, groundnut, tamarind and mango (it can be divided into two equal halves), Class 9 Science Chapter 6 Classification of Plants Additional Important Questions and Answers, Question 1. 10. Answer: Question 6. Has 32 teeth including fang-like canines! (a) Robert Whittaker (gymnos: naked, sperms: seeds). pollen grain, male gamete, female gamete, ovary. Draw a schematic diagram to illustrate the changes that are likely to be observed during the development of new individuals in any one of the organisms named. Answer: 4. Reticulate Venation, Question 4. (a) Write the functions of the following parts in human female reproductive system: This group of plants, which do not have specific parts like root-stem-leaves-flowers but are autotrophic due to the presence of .., is called algae. Modes of sexual reproduction allow for greater variations to be generated which are useful for ensuring the survival of the individuals of species during the struggle for existence. Answer: Question 6. Answer: Each nucleus gathers a bit of cytoplasm around itself, develops a membrane around each structure. The ancient Egyptians worshipped scarabs. How can we classify the plants according to their seeds in this division? List two advantages of growing grapes or banana plants through vegetative propagation. Effect of these methods on the prosperity of the family. Answer: Answer: As long as a few individuals survive mutation and calamity, those individuals will be able to rebuild the bacterial population quickly. (ii) How does A reach part B7 The Devils coach horse beetle can emit a noxious substance to deter predators, Adult males make high amplitude boing noise to attract females, A dik-dik is named after a sound it makes when it is frightened. Chemical methods. Name the hormone secreted and state its function? A slender body and elongated snout give the vine snake a regal look. (2013 D, OD) Environmental causes or injury may cause a slime mold to disperse into many parts, and units as small as a single cell may grow into a whole new slime mold colony/organism. WebEach entry on this list of common misconceptions is worded as a correction; the misconceptions themselves are implied rather than stated. They reproduce by .. formation. Extra marital relations should be avoided (a) Pteridophyta WebA simultaneous (or synchronous) hermaphrodite (or homogamous) is an adult organism that has both male and female sexual organs at the same time. (3) Nephrolepis : Pteridophyta :: Ulothrix : (iv) D Fertilised egg or Zygote (d) Louis Pasteur Their songs are harsh and sound like two rocks hitting together. It contains finger-like projections called villi on the embryos side of the tissue. Question 3. Family planning by using various contraceptives enables a couple to decide on the number of children they want to have and when to have them. Question 11. Answer: After you have the root ball out, shake it to loosen and remove excess soil from it. WebThe main objective of this study is to analyze through tripod strategy Peng, the basics of why the acquisition and sale of Group Model (which it is the largest brewer in Mexico with the highest market share) through analysis of the annual reports of the company. The shy eurasian bullfinch prefers to forage very close to cover. Explanation: If the body of planaria gets cut into a number of pieces, then each body piece can regenerate into a complete planaria by growing all the missing parts. Microsoft pleaded for its deal on the day of the Phase 2 decision last month, but now the gloves are well and truly off. Has characteristics of two or more breeds! Extra Questions for Chapter 8 How do Organisms Reproduce? Many grouper can change their sex, and it is always from female to male. Significant oomycete plant pathogens include: Some slime molds in Phytomyxea cause important diseases, including club root in cabbage and its relatives and powdery scab in potatoes. Fertilisation is also of two types: If the body of hydra gets cut into a number of pieces, then each body piece can regenerate into a complete hydra by growing all the missing parts. (2) False. Enter your email in the box below to get the most mind-blowing animal stories and videos delivered directly to your inbox every day. (a) After fertilisation, zygote is formed which develops into an embryo. (2014 OD) Their plant body structure is flat, ribbon-like, long, without true roots, stem and leaves. Gymnosperms are mostly evergreen perennial and woody. Lappet-faced vultures are tidy and wash their heads in a body of water after theyve eaten. (d) Flowers These entries are concise summaries of the main subject articles, which can be consulted for more detail. The Gros-Michel banana was not so lucky when it was hit by Panama Disease, and almost all specimens of the plant, which were genetically identical due to asexual reproduction, were killed. Hollow, False or Disc-like, Question 5. (2012 OD) Although the Anteosaurus looked like a crocodile, it is more related to mammals than reptiles. Question 2. (2011 D) (iv) Ureter: These are a pair of long, narrow, thin-walled and tubular structures which start from the hilum of the kidneys, run downward and open in urinary bladder. Other contraceptive devices such as loop or the copper-T are placed in the uterus to prevent pregnancy. Killifish are highly sought after for their peaceful nature and ability to adapt to most aquarium communities. a. Answer: Question 2. (b) Thallophyta, Question 4. "name": "What soil do transplanted Ferns prefer? Pyjama Sharks like to swim in shallow inshore waters. What are the characteristics of the above plants in terms of leaf venations? AIDS (Acquired Immuno Deficiency Syndrome), Mutually faithful monogamous relationships. Many species are infected by lentiviruses, which are characteristically responsible for long-duration illnesses with a long incubation period. Mopane worms (larva) only live for 3 - 4 days after evolving into an adult (madora), during which they mate and lay eggss. Gymnosperms are mostly evergreen, perennial and woody. (iii) Seeds are not enclosed in natural coverings. Observing hygienic conditions. Studyrankers is a free educational platform for cbse k-12 students. The simple animals like hydra and planaria show regeneration. When they feel threatened juvenile night herons vomit their stomach contents. While you do this, keep brushing off the soil from the roots with a brush or by using your hands. Sporogenesis is the production of reproductive cells, called spores, which can grow into a new organism. Human Immuno Deficiency Virus List two advantages of vegetative reproduction practised in case of an orange plant. Pollination is done by insects, birds, wind and water. (d) Bryophyta Functions of human testis: Question 9. In these plants, after the process of reproduction, seeds are formed which contain the embryo and stored food. Question 1. Unfertilized egg also passes out along with menstrual bleeding. (iii) where zygote is implanted Uterus Arsinoitherium was a twin-horned mammal that looked like a rhino but is more closely related to present-day elephants. Answer: How is stem and leaves of these types of plants? (9) Depending upon whether seeds are enclosed in a fruit or not, phanerogams are classified into monocots and dicots. (c) Thallophyta Question 1. Regeneration is a mode of asexual reproduction in some organisms. Question 24. These plants are thalloid, multicellular and autotrophic. For example, the Leopard is the official national animal (land mammal) of both Rwanda and Somalia, while the American Fish Eagle is the national bird of Namibia and Zambia, and the Oryx is the national animal of Namibia. Biologydictionary.net Editors. In 1883, Eichler, a botanist, classified the Kingdom Plantae into two subkingdoms. The significance of reproductive health of society are: Question 16. How does pollination lead to fertilization? (2014 OD) The blind snake is often mistaken for a worm. The west coast near the Cape has cold Antarctic currents. There are around 3,000 known species worldwide. "Asexual Reproduction. Two cotyledons, Question 6. (2016 OD) State the basic principle involved in each. The fungi reproduce both sexually and asexually via the production of spores and other structures. Question 7. As a result, almost all crops failed, and many people starved. (d) Angiosperms Answer the following questions in your own words. These lakes are known for their cichlid populations. The exchange of nutrients, oxygen and waste products between the embryo and the mother takes place through the placenta. Answer: Carpenter ants can lift up to seven times their own weight with their teeth! Male crickets can produce sounds by rubbing their wings together. Examples of algae are Spirogyra, Ulothrix, Ulva, Sargassum, etc. What are the characteristics of the above plants in terms of leaf venations? Animals in Africa that went extinct recently are the Northern White Rhino (2018) and the Western Black Rhino (2006). Some notable African rivers include: Click any of the countries below to see a detailed list of animals located in that country! While the Ferruginous hawk is the largest specie in the USA, Asias Upland buzzard is the biggest overall. Produces a lot of milk for its small size. Question 9. As an Amazon Associate I earn from qualifying purchases. Also, while taking it out, collect as much soil as possible with the plant. Because of this, the Catholic Church in South America decided that it was a fish, and people were allowed to eat it during Lent and First Fridays. (b) (i) A Pollen grains Bacteria control the production of pathogenicity factors via quorum sensing. They generally do fine in moist soil and a thick layer of organic mulch. In the seeds are not enclosed by fruit. Depending upon whether the seeds are enclosed in fruit or not, plants are classified as gymnosperms (naked-seeds) and angiosperms (seeds covered by fruit), Depending upon the number of cotyledons in seeds, plants are classified into dicotyledons and monocotyledons. 11. It is a special reproductive female sex cell which combines with male gamete to form zygote. The average lifespan of these strange creatures is 5 to 10 years; however, tailless whip scorpions have been known to live up to a whopping 15 years in captivity! (2011 OD) (2012 D) The African bullfrog is one of only three species of frog that have teeth., African fish eagles belong to the genus of sea eagles. The same problem of asexual reproduction resulted in the deaths of most potato crops due to fungal infection, and subsequently in mass starvation, in the Irish Potato Famine. Hydra reproduces by budding which is an asexual type of reproduction. Nephrolepis: It belongs to division Pteridophyta whereas the others belong to division thallophyta. Answer: 2. The Genet has retractable claws like a cat. Fertilisation occurs in plants as well as in animals. (iii) where zygote get implanted. Examples Cycas, Picea (Christmas tree), Thuja (Morpankhi), Pinus (Deodar), etc. Tamarind, Mango, Apple, Lemon, Question 6. Although they lived during the same time as dinosaurs, they are classified as winged reptiles. (b) Describe the structure and function of placenta. Horseflies have been seen performing Immelmann turns, much like fighter jets. The process of genetic exchange between bacterial cells is sometimes referred to as sex, although it is performed to change the genotype of a mature bacterium, not as a means of reproduction. Crab Spiders can mimic ants or bird droppings. Farmers pick apomictic seeds in plants which do not reproduce sexually. The most protected tortoise in the world! In order to be able to colonize the plant they have specific pathogenicity factors. As a pet, the Senegal parrot is capable of "talking" to its owner. Kenya, Tanzania, and Zanzibar are popular fishing destinations where you can catch several species of tuna, sharks, mackerel, marlin, barracuda, and more. They reproduce asexually by spore formation and sexually by zygote formation. Answer: Answer: 2. (d) all of these. Better family planning has led to reduction in family size and better economic stability. To secrete the male sex hormone called testosterone which is responsible for secondary sexual changes in males. The flowers these plants bear are their reproductive organs. (a) Name the human male reproductive organ that produces sperms and also secretes a hormone. The mantis can turn its head 180 degrees. What do these plants have instead of roots? When the pollen tube enters the ovule, its tip bursts open and male gamete comes out of the pollen tube and combines with the nucleus of the female gamete and forms zygote. Question 4. Some species are thought to carry a weak venom! What are the changes seen in girls at the time of puberty? It prevents the egg to reach the uterus. 4. Question 1. Justify your answer. Biology Dictionary. Fungi like moulds and yeast classified in division thallophyta. What are those organisms called which bear both the sex organs in the same individual? Because of their unique venom delivery system, stiletto snakes are almost impossible to hold safely in the usual way (with fingers behind the head) without being bitten. The next most recent extinct animal was the Bubal Hartebeest (1923). What could be the reasons for adopting contraceptive methods? (2011 OD) What are the different methods of contraception? In sexual reproduction, two parents are involved (male and female). Males tend to be more brightly colored than females, and females are significantly bigger than males. These safari animals are housed in national parks, game reserves, and other sanctuaries for both human safety as well as to avoid their becoming part of the extinct animals in Africa. There are nearly 3,000 different species! Follow a weekly schedule for watering until the Fern has established itself. Many live freely in the soil, but there are some species that parasitize plant roots. (i) Development of egg occurs Ovary Christmas beetles got their common name because theyre most abundant around Christmas time. (iii) where zygote is implanted. (a) Thallophyta Gymnosperms List six specific characteristics of sexual reproduction. (b) Banana (5) Covered seeds (c) Eichler Monk parakeets are the only parakeets that actually build nests. This method of reproduction can take place in any plane in unicellular organisms like amoeba. More variations also lead to evolution of new species after some generations. (b) If the egg does not get fertilised (due to non-availability of sperms in the female body) then the thick and soft inner lining of uterus along with the blood vessels and the dead egg comes out of the vagina in the form of bleeding called menstruation. Plantophiles.com is a participant in affiliate advertising programs designed to provide a means for sites to earn advertising fees by advertising and linking to affiliates. 6. First, dig a hole around the Fern. Haemotixins destroy red blood cells and prevent blood from clotting. Answer: These plants reproduce asexually by spore-formation and sexually by zygote formation. (b) Nephrolepis Angiosperms The common furniture beetle feeds exclusively on wood. There are three different color morphs, which entirely depend on the region that they live in. It is essential for the survival of a species on earth. Banana cinnamon ball pythons came from combining the banana and cinnamon genes. In most pathosystems, virulence is dependent on hydrolases - and the wider class of cell wall degrading proteins - that degrade the cell wall. You may have seen ferns among the ornamental plants in a garden. After putting the Ferns into the pots, cover their roots with the soilless medium. (c) In sexual reproduction, though the genetic material DNA from two gametes, male and female gametes, combine together to form a new cell zygote but the amount of DNA in zygote does not get doubled. In 1883, classified plants into two sub-kingdoms. become extinct. Answer: It develops into fruit after fertilization. Question 19. Question 9. In the flowers are reproductive organs. Name the life process of an organism that helps in the growth of its population. (gymnos: naked, sperms: seeds). Barrier method: In this method, the fertilization of ovum and sperm is prevented with the help of barriers. (10) True But, they do not bear flowers and fruits. How are the seeds of these types of planis? The flowers of Angiosperms plants bear are their .. organs Flowers develop into .. and seeds are formed within .. . (2016 OD) List four advantages of vegetative propagation. Slime molds can produce spores much like a fungus, and they can also reproduce through fragmentation. You may have seen a lush green soft carpet on old walls, bricks and rocks in the rainy season. Question 1. Chemical methods. So the new cell zygote formed by two gametes cells will have the normal amount of DNA. Write the characteristics of Thallophyta. Plants belonging to thallophyta group may be unicellular or multicellular. Their stems are without .. Or is it Safe for Cats. Galapagos sharks are cannibalistic and sometimes eat their young, so the pups stay away from the adults in shallow water. (i) Where the development of egg occurs. As such, they are hosts to immature forms of the parasites that do not reproduce sexually. They have a well-developed conducting system. Bush Viper: Arboreal snakes found in the tropical rainforests of Western and Central Africa. Spirogyra: Question 3. Three different methods of contraception: There are about 3,000 documented species! The dung beetle can push objects many times its own weight. Soak the seeds of corns, beans, groundnut, tamarind, mango, wheat, etc. Minor variations may also lead to the stability of the species. Answer: (a) Thallophyta Sketch and label the figures of the following plants and explain them into brief. Question 1. (a) Pteridophyta In asexual reproduction, the offsprings are almost identical to their parent because they have the same genes as their parent, so much genetic variation is not possible in asexual reproduction. Thallophyta: These plants grow mainly in water i.e. WebBrowse our listings to find jobs in Germany for expats, including jobs for English speakers or those in your native language. A diseased patch of vegetation or individual plants can be isolated from other, healthy growth. The cells of cut body part divide rapidly to make a ball of cells. This dog has a thick coat of fur despite its origins in Morocco, a country known for its hot temperatures. Various types of fungi like yeasts and moulds which do not have chlorophyll are also included in this group. It also functions as an endocrine gland and secretes hormones necessary for maintaining pregnancy. The cells then become specialised to form different types of tissues which again form various organs and body parts. Diagram for Regeneration in Planaria: Question 13. (2012 D) What are the characteristics of the above plants in terms of type of stem? Nuthatches spend a lot of their time upside down. (a) Leishmania and Plasmodium reproduce by fission (asexual mode of reproduction). Define the terms pollination and fertilisation. The transfer of pollen grains from anthers (male sexual parts) of a flower to the stigma part of the pistil (female sexual part) is known as pollination. The engineering of food plants may be less rewarding, however, as higher output is frequently offset by popular suspicion and negative opinion about this "tampering" with nature. Stunning bird with a stinky way to deter predators! C. No need for a mate. Gymnosperms are mostly evergreen, perennial and woody. Adult Mole crickets may fly as far as 5 miles during mating season and are active most of the year. How the venations are present on the leaves of these types of plants? Which differences did you notice in gymnosperms and angiosperms? The embryo gets nutrition from the mothers blood with the help of a special tissue called placenta. The red fox actually has many different variations of fur, including silver and brown. Question 2. (ii) where fusion of egg and sperm takes place Fallopian tube The Egyptian tortoise is one of the smallest tortoise species in the world. The Food and Agriculture Organization estimates that pests and diseases are responsible for about 25% of crop loss. The cells then become specialised to form different types of tissues which again form various organs and body parts. Bamboo, bananas, corn, daffodils, garlic, ginger, grass, lilies, onions, orchids, rice, sugarcane, tulips, and wheat, Question 7. African rivers range from the Nile River, which stretches more than 4,000 miles in length and is a haven of wildlife in the harshness of the Sahara Desert to the Okavango River, which has an inland delta that covers 600,000 acres in swamps and floods during dry seasons to create a gathering ground for thousands of animals. The structure of the plant body of bryophytes is flat, ribbon-like long, without true roots, stem and leaves. (a) Halophyta How does it help in providing stability to the population of species? They are called as algae. (a) Name the respective part of human female reproductive system: (a) Robert Whittaker, Question 2. Answer: Revision Notes for Chapter 8 How do Organisms Reproduce? The right time to transplant is when the Fern has grown out of the pot. 7. There are surgeries that can be carried out in males and females. The body breaks up on maturation into two or more smaller pieces and each piece then develops into a new individual. Keep watering until the soil becomes moist, and excess water starts to drain out of the bottom. (i) Virus: Transmission of such diseases can be prevented by the following ways: Question 4. Gymnosperms bear their male and female flowers on different sporophylls of the same plant Africa has several different types of habitats from jungles and forests to grasslands and deserts. Example: The flowers of hibiscus and mustard plants are bisexual flowers. Rose, sunflower, grapes, strawberries, tomatoes, peas, peanuts and potatoes, Observe the figure and answer the questions, Question 1. The blue tit can hang upside down from branches. How is the process of pollination different from fertilization? Fall is the ideal time for transplant as it is moist and cool. List any four methods of contraception used by humans. All of them can be seen in South Africa and are native animals:Rhinos are one of the Big Five African Land AnimalsHenk Bogaard/Shutterstock.com. Reproduction in amoeba: Unicellular organisms like amoeba and paramecium reproduce by binary fission. 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