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Rohit Sharma
Query: 6 / Answer: 2

28th Oct 2019 .

 Draw and label the enlarged view of microsporangium of an angiosperm. State the function of its innermost wall layer.

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Rachna Dhingra
Query: 2 / Answer: 4

28th Oct 2019 .

Labelled diagram of microsporangium of an angiosperm is as follows :

The innermost wall layer or tapetum has the following functions:
(i) It helps in nourishment of the developing microspore mother cells and pollen grains.
(ii) It produces lipid rich Ubisch granules containing sporopollenin for exine formation, pollenkitt in case of entomophilous pollen grains, special proteins for the pollen grains to recognise compatibility and hormone IAA.
(iii) It secretes enzymes like callase which is responsible for the degradation of callose wall around pollen tetrad
 
 
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