Question

(a) Draw a diagram of an enlarged view of T.S. of one microsporangium of an angiosperm and label the following parts:
(i) Tapetum
(ii) Middle layer
(iii) Endothecium
(iv) Microspore mother cells
(b) Mention the characteristic features and function of tapetum.
(c) Explain the following giving reasons:
(i) Pollen grains are well preserved as fossils.
(ii) Pollen tablets are in use by people these days.

Answer 1

Answer:

I can't understand your question

Answer 2

Tapetum helps in dehiscence of anther to release the Pollen grains upon maturation. The Pollen grains are having sporopollenin which is a chemically inert substance. So they remain preserved in Fossils. Pollen grains are found to be nutritious, so can be consumed as tablets.

Explanation:

• The microsporangium is the organ of plants where the microspore mother cells grow and divide to form the pollen grains.

• It has four layers of protection namely Epidermis, Endothecium, Middle layer and Tapetum.

• The tapetum is the final layer and the innermost layer just outside the microspore mother cells.

• These tapetum dries up as the pollens mature and they contract leading to the dehiscence of anther.

• The pollens are preserved in Fossils owing to the presence of sporopollenin on the outer layer of pollens.

• Sporopollenin is a very hard compound, chemically inert to most of the chemicals.

• So external environmental harshness can't destroy them.

• Pollen contents and the sporopollenin are now a days found to be nutritious for personal health.

• So they are either consumed as tablets, or sachets of powdered pollen contents.

For more information about pollens and microsporangium,

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