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Sexual Reproduction in Flowering Plants Test - 88

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Sexual Reproduction in Flowering Plants Test - 88
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  • Question 1
    1 / -0
    The emasculation is required for
    Solution

    Correct Option: D

    Explanation: 

    •  Emasculation is a process of removal of anther or stamen or the pollen of bisexual flowers without affecting female reproductive parts which are known as pistils. It is done to prevent self-pollination in bisexual flowers. The desired plant are selectively hybridized with help of emasculation.

    Hence, emasculation is required for Selective Hybridization.

  • Question 2
    1 / -0
    Endospermic seeds are found in
    Solution
    Those seeds in which the endosperm persists even after germination are called endospermous seeds. Barley and castor are examples of monocot and dicot endospermous seeds respectively.
    So, the correct answer is 'Both (a) and (b)'
  • Question 3
    1 / -0
    Careals, castor and coconut possess ______ seeds.
    Solution
    If the endosperm exists after the seed has germinated then the seeds are referred to as endospermous seeds, this could be due to greater synthesis or lesser utilization by the developing embryo.
    Examples, cereals, castor and coconut
    So, the correct answer is 'Endospermic'
  • Question 4
    1 / -0
    The mature seeds of plants such as gram and peas, possess no endosperm, because
    Solution
    Gram and pea both are dicot seeds. Cotyledons take up most of the space in the seed and these cotyledons become filled with the material that will nourish the growing embryo. therefore the endosperm is used up by the developing embryo.

    So, the correct option is endosperm gets used up by the developing embryo during seed development.
  • Question 5
    1 / -0
    Several pollen grains form a unit designated as pollinium in Family.
    Solution
    In Calotropis and related plants of Family Asclepiadaceae, all the pollen grains of an anther lobe remain united in a single sac called pollinium. Two pollinia of adjacent anthers are attached to produce a translator.
  • Question 6
    1 / -0
    ________ is not an endospermic seed.
    Solution
    Endosperm represents the food storing tissue of a seed. It is produced as a result of double fertilisation in angiosperms. In most monocots and some dicot seeds, the food reserve remains in the endosperm. They are called endospermic or albuminous seeds, e.g., maize, wheat, castor bean, coconut, barley, rubber. However, in the majority of dicot seeds(e.g., orchids, Sagittaria), the endosperm is consumed during seed development and the food is stored in cotyledons and other regions. They are called non endospermic or exalbuminous seeds.
    So, the correct answer is 'Pea'.
  • Question 7
    1 / -0
    Spiny or sticky pollen grains and large, attractively colored flowers are associated with?
    Solution
    • Entomophily takes place through the agency of insects. 
    • The pollen grains are sticky or spiny to easily get attached to the body of pollinators. 
    • When the insects visit the flowers, their body gets dusted with pollen grains, and when they fly and visit other flowers, they brush against the stigma which being sticky, receives the pollen grains from their body. 
    So, the correct answer is option B. 
  • Question 8
    1 / -0
    Identify the wrong statement regarding post-fertilisation development.
    Solution
    After fertilisation, the integuments of the ovule form the protective coats(seed coats); Outer integument develops into testa and the inner one develops into tegmen.
  • Question 9
    1 / -0
    Polyembryony commonly occurs in.
    Solution
    Polyembryony refers to the phenomenon of having more than one embryo in the same seed. In Citrus, a seed has 2−402-40 embryos, one normal embryo and the rest adventitive embryos(mostly nucellar). In adventitive embryony, an embryo develops directly from a diploid cell other than egg like that of nucellus and integument, e.g., Citrus, Opuntia.
  • Question 10
    1 / -0
    Plants with ovaries having only one or a few ovules are generally pollinated by _____________.
    Solution
    • Anemophilous flowers are small, inconspicuous, colourless, odourless and nectarless. Flower's non-essential parts are either absent or reduced.
    • In the case of unisexual flowers, the male flowers are more abundant. In bisexual flowers, the stamens are generally numerous. Pistils are generally uniovuled.
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