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In over 60% of angiosperms pollen grains...

In over 60% of angiosperms pollen grains are shed at

A

One celled stage

B

Three nuclei stage

C

Two celled stage

D

Three celled stage

Text Solution

Verified by Experts

The correct Answer is:
C
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In over 40% of angiosperms, pollen grains are shed at 3 celled stage, these 3 cells are :

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Read the following four statements ( A -D ): (i) The outer wall of the pollen grain is pecto - cellulosic in nature. (ii) In pollen grain, the generative cell is bigger and contains abundant food reserve. (iii) In all angiosperm , pollen grains are always shed at the 2-celled stage. (iv) Usually , sporogenous cell directly behaves as the megaspore mother cell. How many of the above statements are wrong ?

MOTION-SEXUAL REPRODUCTION IN FLOWERING PLANTS-Exercise - 2
  1. Each cell of sporogenous tissue is potential pollen or microspore moth...

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  2. In over 60% of angiosperms pollen grains are shed at

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  3. Pollen grains of many species cause severe allergies & bronchial affli...

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  4. In a pollen grain the small cell is spindle shaped, with dense cytopla...

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  5. A typical angiosperm embryosac at maturity is :-

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  6. Arising from placenta is megasporangium which is commonly known as :

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  7. Single shield shaped cotyledon of grass is known as:-

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  8. Epicotyl has a shoot apex and few leaf primordia enclosed in a hollow ...

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  9. Although in most species fruits are result of fertilisation, there are...

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  10. Non albuminous seeds are present in :-

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  11. The coconut water from tender coconut that you are familiar with is :...

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  12. One of the male gamete moves towards the egg cell & fuses with its nuc...

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  13. Endosperm development precedes embryo development, the endosperm of an...

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  14. Transfer of pollen grains from the another to the stigma of another fl...

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  15. The part of pistil which acts as landing platform for pollen grain is

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  16. The inner most wall layer of anther is tapetum, the main function of t...

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  17. Two non motile male gametes in angiosperms are produced by :-

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  18. Alerone layer that is protein rich found in some cereals is a part of ...

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  19. In angiosperms functional megaspore generally develops at

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  20. When embroy develops from a haploid cellof embroysac , other than egg ...

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