Which of the following statements are false?
(I) Pollen grains represents male gametophyte.
(II) Pollen grain exine has prominent apertures called germ pores where sporopollenin is absent
(III) In over 
of angiosperms, pollen grains are shed at 3 - celled stage.
(IV) Formation and differentiation of pollen grains is called microsporogenesis
(V) Pollen grain has a prominent 2-layered wall
(VI) Pollen grains of some plants produce severe allergy and respiratory or bronchial diseases.
(VII) Pollen grains are poor in nutrients.
Text Solution
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In over 60 per cent of angiosperms, pollen grains are shed at this 2 -celled stage. In the remaining species, the generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage).
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