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Sexual Reproduction in Flowering Plants Test - 21

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Sexual Reproduction in Flowering Plants Test - 21
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  • Question 1
    1 / -0

    Male gametophyte of an angiosperm produces

    Solution

    Pollen grain or male gametophyte in angiosperms contains one generative cell. The generative cell further divides mitotically to form two male gametes (sperms). So, a mature male gametophyte in angiosperms contains two sperms and one vegetative cell.

     

  • Question 2
    1 / -0

    Pollen tablets available in market are for

    Solution

    A complete protein, rich in vitamins, minerals, enzymes, amino acids and anti-oxidants, it is considered an immune system builder that will also enhance vitality. Bee pollen is a great brain booster, lifting brain fatigue, improving alertness and helping concentration levels over an extended period of time.

     

  • Question 3
    1 / -0

    Assertion:  Insects visits flowers to gather honey.

    Reason: Attraction to flowers prevents the insects from damaging other parts of plant.

    (A) If both Assertion and Reason are true and R is correct explanations of A

    (B) If both Assertion and Reason are true and R is not the correct explanations of A

    (C) If Assertion is true but Reason is false

    (D) If both Assertion and Reason are false

    Solution

    Insect visit flowers to get nectar. Nectar is contained in a special gland called nectary and sometimes in a special structure called spur. The attraction of flower in plants is not to diverge the insect from damaging other part, but to bring about pollination (i.e. transfer of pollen to the stigma). The pollen grains in insect pollinated flowers are either sticky or provided with spinous outgrowths. The stigma is also sticky. Insect often visit these flower for nectar and in evidently carry out pollination.

     

  • Question 4
    1 / -0

    Assertion: The ovary forms fruit after fertilization.

    Reason: The ovary forms parthenocarpic fruits without fertilization.

    (A) If both Assertion and Reason are true and R is correct explanations of A

    (B) If both Assertion and Reason are true and R is not the correct explanations of A

    (C) If Assertion is true but Reason is false

    (D) If both Assertion and Reason are false

    Solution

    After fertilization the ovary begins to grow and gradually matures into the fruit. In some cultivated varieties of oranges, banana, grapes, apples, pineapples and some other fruits the ovary may grow into the fruit without fertilization. Such a fruit is seedless or with immature seeds and is known as the parthenocarpic fruits.

     

  • Question 5
    1 / -0

    The statements given below describe certain features that are observed in the pistil of flowers.

    i. Pistil may have many carpels.

    ii. Each carpel may have more than one ovule.

    iii. Each carpel has only one ovule.

    iv. Pistil have only one carpel.

    Choose the statements that are true from the options below:

  • Question 6
    1 / -0

    Study of Pollen gains is ………….

  • Question 7
    1 / -0

    Stalk of funicle is ……..

  • Question 8
    1 / -0

    Match the following

    Column A Column B
    (a) Autogamy (i) Transfer of pollen grains from the anther to the stigma of the same flower.
    (b) Geitonogamy (ii) 

    Transfer of pollen grains from the anther to the stigma of another flower of the same plant.

    (c) Xenogamy (iii) 

    Transfer of pollen grains from anther to the stigma of a different plant.

  • Question 9
    1 / -0

    If the diploid number of an angiospermic plant is 24, the number of chromosomes in the pollen grain, endosperm and integument will be

    Solution

    12, 36, 24; because pollen grains are haploid while endosperm has triploid chromosome number and integument is diploid in nature.

     

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