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Assertion : In most angiosperms, microsp...

Assertion : In most angiosperms, microspores of a tetrad grow and separae from one anotehr shortly after meisois.
Reason : In the members of families Orchidaceae and Asclepiadaceae, all the pollen grains of a sporansium remain united to form a compact structure called pollinium.

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 both assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
b
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NCERT FINGERTIPS-SEXUAL REPRODUCTION IN FLOWERING PLANTS-Sexual Reproduction In Flowering Plants
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  2. In the embryos of a typical dicot and a grass, true homologous structu...

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  3. The phenomenon observed in some plants wherein parts of the sexual ap...

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  4. In a flower, if the megaspore mother cell forms magaspores without und...

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  5. The phenomenon wherein, the ovary develops into a fruit without fertil...

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  6. Assertion : An angiospermous flower represents the modified condensed ...

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  7. Assertion : A typical microsporangium of angiosperms is generally surr...

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  8. Assertion : In a microsporangium, the tapetal cells possess tittle cyt...

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  9. Assertion : In most angiosperms, microspores of a tetrad grow and sepa...

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  10. Assertion : Exine of a pollen grain is made up of sporopollenin which ...

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  11. Assertion : The method of development of embryo sac from a single func...

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  12. Assertion : Although geitonogamy is functionally crosspollination invo...

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  13. Assertion : Hydrophily constitues a major mode of pollination in most ...

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  14. Assertion : Only the pre-pollination growth of male gametophyte occurs...

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  15. Assertion : Self-incompatibility is a genetic mechanism which prevents...

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  16. Assertion : In angiosperms, endosperm development precedes embryo deve...

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  17. Assertion : In Cocos nucifera coconut water represents the cellular en...

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  18. Assertion : During embryo development in dicots, suspensor serves as t...

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  19. Assertion : Ex-albuminous seeds do not possess any residual endosperm,...

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  20. Assertion : In plants, apomixis is a form of asexual reporduction that...

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