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Sexual Reproduction in Flowering Plants Test - 80

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Sexual Reproduction in Flowering Plants Test - 80
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  • Question 1
    1 / -0
    Common between vegetative reproduction and apomixis is
    Solution
    The progeny produced by the vegetative reproduction and apomixis are identical to their parents as the process of fusion of gametes do not take place so there is no recombination of characters. The offsprings are produced by mitosis.
    Apomixis is a mode of asexual reproduction. The development of plants takes place without fusion of gametes. It is a powerful tool which fixes heterosis. The developed seeds are maternal clones. The somatic cell directly forms aposporous initial cells which forms embryo and finally develops into seed. In some cases, the megaspore mother cell directly forms the embryo sac and develops into the seed.
    Vegetative propagation is the method of propagation of plant by vegetative parts of the plant.
    So, the correct answer is option D.
  • Question 2
    1 / -0
    A typical dicotyledonous embryo consists of
    Solution
    A mature dicot embryo contains naturally attached two cotyledons to the embryonal axis. The portion of the embryonal axis which is above the level of cotyledons forms the epicotyl and the portion below the embryonal axis forms the hypocotyl. The terminal portion of epicotyl forms the plumule while the terminal portion of the hypocotyl forms the radicle.
    Thus, a typical dicotyledonous embryo consists of radicle, embryonal axis and cotyledons.
    So, the correct answer is B.
  • Question 3
    1 / -0
    Development of seed from an unfertilized egg is?
  • Question 4
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    Plants of which one of the following groups of genera are pollinated by the same agency.
    Solution
    Bombax, butea, bauhinia all are wind pollinated plants and are known as anemophilous.
    So, the correct option is C.
  • Question 5
    1 / -0
    Versatile anthers are connected with
    Solution
    • Entomophily is the pollination of flowers by means of insects.
    • Malacophily is the pollination of flowers by means of snails and slugs.
    • Ornithophily is the pollination of flowers by means of birds.
    • Anemophily is the pollination of flowers by means of wind.
    Versatile anthers are the anthers that are attached to the filament at their middle portion so that they can move freely. Versatile anthers are meant for pollination by wind i.e. anemophily because they can dangle freely and move due to wind to shed their pollens which are carried away by the wind. 
    So, the correct answer is D.
  • Question 6
    1 / -0
    Choose the mismatched option.
    Solution
    • Pollination by means of wind is called Anemophily. Example, Cannabis.
    • Pollination by means of water is called Hydrophily. Example, Zostera.
    • Pollination by means of insects is called Entomophily. Example, Salvia.
    • Pollination by means of birds is called Ornithophily. Example, Begonia.
    • Pollination by means of bats is called Chiropterophily. Example, Kigelia.
    Hence, the mismatched pair is D, because Adansonia is a plant which is pollinated by bats, not by birds.
    So, the correct answer is D.
  • Question 7
    1 / -0
    Pollen grains have spiny exine to aid in
    Solution
    • The pollen grains which have spiny exine are related to Entomophily i.e. pollination by insects. Spines help in the attachment of the pollen to the body of pollinators. This, pollen grains have spiny exine to aid in Entomophily.
    • Anemophily is the pollination of flowers by means of the wind.
    • Ornithophily is the pollination of flowers by means of birds.
    • Chiropterophily is the pollination of flowers by means of bats.
    So, the correct answer is A.
  • Question 8
    1 / -0
    In a type of apomixis known as adventive embryony, embryos develop directly from
    Solution
    Apomixis is a kind of asexual reproduction in which viable embryo is formed within the confines of seed coat without meiosis and syngamy. Apomixis includes adventive embryony in which, there is formation of extra embryos due to sporophytic budding. One or more sporophytic cells, either nucellus or integuments undergo stages of embryogeny and eventually develop into mature embryos.
    So, the correct answer is A.
  • Question 9
    1 / -0
    Which of the following statements is true with reference to cross pollination?
    Solution
    • Cross pollination produces better offspring but the yield is not higher because not all pollen grains are able to reach the stigma of other flowers and incompatibility barriers are also there in which pollen of one species is not able to germinate on the stigma of other species. Hence statement A is incorrect.
    • Cross pollination occurs in unisexual as well as bisexual flowers. In some plants, bisexual flowers have adaptations that prevent self pollination such as floral barriers, heterostyly, dicliny etc. and only cross pollination can occur in such flowers. Hence, statement B is incorrect.
    • Cross pollination can occur over long distances where the pollination is carried out by means of pollinating agents such as wind, water, insects, birds etc. Hence statement C is incorrect.
    • Cross pollinated plants need to produce a large number of pollen grains as most of them are lost in their journey from one flower to another flower. Hence, statement D is correct.
    So, the correct answer is D.
  • Question 10
    1 / -0
    Endosperm is completely consumed by the developing embryo in
    Solution
    In some plants, the endosperm is completely consumed by the growing embryo. Such seeds in which no endosperm is left are called exalbuminous or non-endospermous seeds.
    Examples are Pea, Bean, Groundnut.
    Whereas the seeds, in which endosperm is not completely consumed by the growing embryo and is persistent, are called albuminous or endospermous seeds. Examples are Maize and Castor.
    So, the correct answer is A.
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