The outer layer of the pollen wall, called the exine, is mainly composed of which substance?
Answer and explanation
Correct answer: Sporopollenin
The exine is mainly made of sporopollenin, an exceptionally resistant biological polymer. It protects pollen from desiccation, decomposition, enzymes, and other environmental stresses during transfer from anther to stigma. The inner intine contains mainly cellulose and pectin. Cellulose, lignin, and chitin are therefore not the best answer for the principal material of the exine.
Frequently asked questions
What is the correct answer to this question?
Sporopollenin
Why is this the correct answer?
The exine is mainly made of sporopollenin, an exceptionally resistant biological polymer. It protects pollen from desiccation, decomposition, enzymes, and other environmental stresses during transfer from anther to stigma. The inner intine contains mainly cellulose and pectin. Cellulose, lignin, and chitin are therefore not the best answer for the principal material of the exine.
Which subject and chapter does this question cover?
This is a Class 11 Biology question. Chapter: Morphology of Flowering Plants. Topic: flowers.
