Draw the given diagram and label the following parts:
i) Exine ii) Tube nucleus
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Notes on exine and tube nucleus is provided below :
(i) Exine
In a pollen grain, there is the presence of an outer layer which is very tough or hard. This layer is known as exine.
This layer is composed of a very resistant organic matter which is named as sporopollenin.
Because of the presence of this organic matter, pollen grains cannot be destroyed even at high temperatures.
(ii) Tube nucleus
In a microspore, two nuclei are formed by the process of mitosis division. One nucleus among these two is termed as tube nucleus.
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