Question

Based on the given excerpt, answer the given question.

Stamen is regarded as a microsporophyll that possesses microsporangia which have microspore mother cells that give rise to microspores. The cells of sporogenous tissues undergo meiotic division to form microspore tetrad. Microspore is present in the bilobed structure called anther. A male gametophyte is a gamete producing haploid phase in a plant. In angiosperms, it is the pollen grains that are regarded as gametophytes.

The inner wall of pollen grain is called ____A_____ and it is made up of ____B___.
[1 mark]

• A. A - exine, B - cellulose
• B. A - intine, B - cellulose and pectin
• C. A - exine, B - sporopollenin
• D. A - intine, B - pectin

Answer 1

The correct option is B A - intine, B - cellulose and pectin

The pollen grain is the male gametophyte. The wall of pollen grain is made up of two layers.

Intine is the inner wall of the pollen grain. It is made up of cellulose and pectin. It is a thin continuous layer.

Exine is the outer wall of the pollen grain. It is hard and made up of a highly resistant organic substance called sporopollenin.

Figure : Structure of pollen grain