Directions : In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as :
(a) If both assertion and reason are true and reason is the correct explanation of assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of assertion.
(c) If assertion is true but reason is false.
(d) If assertion is false but reason is true.
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Assertion : An angiospermous flower represents the modified condensed shoot.
Reason : The fertile leaves of the shoot become modified into microsporophylls which bear ovules.
(c)
Assertion : A typical microsporangium of angiosperms is generally surrounded by four wall layers – epidermis, endothecium, middle layers and tapetum.
Reason : The outer three wall layers perform the function of protection and help in dehiscence of anther.
(b)
Assertion : In a microsporangium, the tapetal cells possess little cytoplasm and generally have a single prominent nucleus.
Reason : During microsporogenesis, the microspore mother cells (MMCs) undergo meiotic divisions to produce haploid microspore tetrads.
(d)
Assertion : In most angiosperms, microspores of a tetrad grow and separate from one another shortly after meiosis.
Reason: In the members of Family Asclepiadaceae, all the pollen grains of a sporangium remain united to form a compact structure called pollinium.
(b)
Assertion : Exine of a pollen grain is made up of sporopollenin which is resistant to high temperature, strong acid or alkali as well as enzymatic degradation.
Reason : Sporopollenin is absent in the region of germpores.
(b)
Assertion : The development of embryo sac from a single functional megaspore is termed as monosporic development.
Reason : In monosporic (Polygonum) type of embryo sac development, usually the megaspore which is situated towards micropylar end remains functional.
(c)
Assertion : Although geitonogamy is functionally cross pollination involving a pollinating agent, genetically it is similar to autogamy.
Reason : In geitonogamy, pollen grains from the anthers of one flower are transferred to the stigma of another flower borne on the same plant.
(a)
Assertion : Hydrophily constitutes a major mode of pollination in most of the aquatic angiospermous plants.
Reason : Vallisneria and Zostera are examples of water pollinated plants.
(d)
Assertion : Only the pre-pollination growth of male gametophyte occurs inside the microsporangium whereas the remaining growth occurs over the female reproductive organs.
Reason : Whole of the growth of female gametophyte occurs inside the megasporangium.
(b)
Assertion : Self-incompatibility is a genetic mechanism which prevents self-pollination by inhibiting either pollen germination or pollen tube growth in the pistil.
Reason : In gametophytic self-incompatibility, the incompatibility reaction is determined by the genotype of the sporophytic tissue.
(c)
Assertion : In angiosperms, endosperm development precedes embryo development.
Reason : Double fertilisation ensures that the nutritive tissue is formed before the zygote starts cleaving.
(a)
Assertion: In Cocos nucifera, coconut water represents the cellular endosperm and the surrounding white kernel represents the free-nuclear endosperm.
Reason : Endosperm persist in some mature seeds.
(d)
Assertion : During development of embryo in dicots, suspensor serves as the main nutritive tissue for the embryo.
Reason : The last cell of the suspensor at the end adjacent to the embryo is known as hypophysis.
(d)
Assertion : Ex-albuminous seeds do not possess any residual endosperm, as it is completely consumed during embryo development.
Reason : Wheat, castor, pea and groundnut all are examples of ex-albuminous seeds.
(c)
Assertion : In plants, apomixis is a form of asexual reproduction that mimics sexual reproduction.
Reason : Apomixis involves the production of seeds without the fusion of gametes.
(a)
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