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Reproduction in Organisms Test - 51

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Reproduction in Organisms Test - 51
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  • Question 1
    1 / -0
    A piece of potato tuber will form a new plant if it has
    Solution
    Tubers are the underground modification of stem which stores starch. It has axillary buds on its surface which helps in the growth of new plant as this buds are meristematic in nature. The buds are also known as eye or scales. The buds sprout and develop into a new plant. Potatoes need frequent irrigation. The first irrigation should be given immediately after sowing, and thereafter at one week intervals. After tuber formation, the frequency of irrigation is decreased. 
    So, the correct answer is option D.
  • Question 2
    1 / -0
    Potatoes are cultivated by
    Solution
    Tubers are the underground modification of stem which stores starch. It has buds on its surface which help in the growth of the new plant as this buds are meristematic in nature. The buds are also known as an eye. Potatoes need frequent irrigation. The first irrigation should be given immediately after sowing, and thereafter at one week intervals. After tuber formation, the frequency of irrigation is decreased. Care must be taken while irrigating that the water does not reach fee top of the ridge.
    So, the correct answer is option C.
  • Question 3
    1 / -0
    Monoestrus animals have
    Solution
    Estrous cycle is a reproductive cycle of females of non-primate vertebrates. The gap between two estrus periods is known as estrous cycle. The females are highly receptive during estrus period. It is an indication of breeding period because one or more periods of estrus may occur during the breeding season of a species. Some animals like dogs are monoestrous as they have only one estrous phase in their breeding cycle. Males can recognize a female in heat by smell of pheromones.
    So, the correct answer is option C.
  • Question 4
    1 / -0
    Which is not an example of vegetative propagule in angiosperms
    Solution
    Chlamydomonas is biflagellate and reproduces asexually by zoospores. The zoospores are identical to the parent cell in structure but smaller in size. The zoospores simply enlarge to become mature Chlamydomonas. It is not a vegetative part.
    Vegetative propagation is the method of propagation of plant by vegetative parts of the plant. Eyes of potato, rhizome of ginger, bulbil of agave is an example of vegetative propagation. 
    Tubers are the underground modification of stem which stores starch. It has buds on its surface which helps in the growth of new plant as these buds are meristematic in nature. The buds are also known as eye. 
    Ginger is multiplied vegetatively by rhizome. It is a underground modification of stem. It develops root and shoots from the nodes. The nodes are meristematic in nature which produces adventitious root and shoots. The plant uses the rhizome to store starch, proteins, and other nutrients. 
    Bulbils are small bulb like structure which is mainly present in the axil of leaf and stem. Agave bears bulbil which falls on the ground and form a new plant. It is present in the axil of bracts in agave. Bulbils are considered as modified vegetative and floral buds which stores food and also helps in vegetative propagation of the plants.
    So, the correct answer is option A.
  • Question 5
    1 / -0
    Hermaphrodite animal is
    Solution
    Hermaphrodite animal is a animal which has both male and female reproductive gametes in the same individual. Leech is a hermaphrodite because it has both the reproductive gametes in same individual. The sperms and ova mature at different times so the fertilization is reciprocal which means the leeches use a clitellum to hold their eggs and secrete the cocoon it is fertilized by sperms of another leech.
    So, the correct answer is option D.
  • Question 6
    1 / -0
    Syngamy can occur outside the body of organisms in
    Solution
    Syngamy is sexual reproduction by fusion of male gamete( sperm) with female gamete ( egg ) to form a zygote which eventually develops in the new organism.
    In algae, the fusion of gametes happens outside the body of a plant, in water. The gametes are single cells without any protection. In all other plants, the fusion of gametes occurs inside the parent body and zygote is protected by the embryo.
  • Question 7
    1 / -0
    Find out correct order of vegetative propagules of plants like Potato, Ginger, Agave, Bryophyllum and Water Hyacinth
    Solution
    Tubers are the underground modification of stem which stores starch. It has buds on its surface which help in the growth of the new plant as these buds are meristematic in nature. The buds are also known as eye. For example, eye.
    Ginger is propagated by the rhizome. It is an underground stem modification. The terminal bud of rhizome may or may not grow into an aerial shoot. The stem is differentiated into nodes and internodes. Adventitious root occurs on the lower side. 
    Bulbils are a small bulb-like structure which is mainly present in the axil of leaf and stem. Agave bears bulbil which falls on the ground and forms a new plant. It is present in the axil of bracts in agave. Bulbils are considered as modified vegetative and floral buds which stores food and also helps in vegetative propagation of the plants.
    The multiplication of plant which takes place by the vegetative parts of the plant like stem, leaf, flower or fruit is known as vegetative propagation. Bryophyllum is multiplied vegetatively by leaves. The leaves of the Bryophyllum has notch which when falls on the moist soil, germinates into flower. The notch is meristematic in nature which has the potential to germinate into a new plant which has adventitious roots.
    Water Hyacinth propagates by offsets. An offset is a short thick runner like the branch which produces a new plant at its tip. The offsets grow in all directions from the main stem of the parent plant. 
    So, the correct answer is option C.
  • Question 8
    1 / -0
    Process of sexual reproduction which involves meiosis and syngamy is
    Solution
    The process of fusion between haploid male nucleus and egg nucleus is known as amphimixis. It is also known as syngamy. The process is known as fertilization which leads to formation of a diploid zygote. It leads to the recombination of character which causes variation. It is a mode of sexual reproduction. The haploid gametes are formed by meiosis.
    Apomixis is a mode of asexual reproduction. The development of plants takes place without fusion of gametes. The embryo develops without the fertilization of seeds. It is a powerful tool which fixes heterosis. The developed seeds are clones of plant. The ovule undergoes meiosis and forms aposporous initial cells which forms meiosis. It involves only meiosis not syngamy. 
    Agamospermy is asexual reproduction in which seeds are produced from unfertilized ovules. The removal of the anthers of a flower in order to prevent self-pollination is known as emasculation. 
    In diplospory, the megagametophyte arises from a cell of the archesporium.
    So, the correct answer is option B.
  • Question 9
    1 / -0
    In sexual reproduction of algae fusion between one large, non-motile (static) female gamete and a smaller motile male gamete is termed as
    Solution
    The fusion of similar motile gametes is known as isogamous.
    The motile gametes taking part in fusion may either differ in size or physiological behaviour is known as anisogamous.
    Oogamous is a condition of heterogamy where one gamete is large and nonmotile, while the other is small and motile. In sexual reproduction of algae fusion between one large, non-motile (static) female gamete and a smaller motile male gamete is termed as oogamous. The large non-motile female egg fuses with male gamete which is motile and it is known as antherozoid. 
    So, the correct answer is option C.
  • Question 10
    1 / -0
    Vegetative propagation in Mint occurs by
    Solution
    Sucker is a mode of vegetative propagation. It is a non- green slender stem branch which arises from the underground base of erect shoot or crown. It grows horizontally in the soil and ultimately comes out to form a new aerial shoot or crown. Each sucker has nodes with scale leaf and axillary bud. For example, mint has the sucker. It has adventitious root and scale leaf.
    So, the correct answer is option A.

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