The outer wall of a pollen grain, called the exine, is mainly composed of which substance?
Answer and explanation
Correct answer: Sporopollenin
Sporopollenin is the main material of the pollen exine and is highly resistant to decomposition, desiccation, enzymes, and environmental stress. This durable layer protects pollen during transport. Germ pores are regions where exine is thin or absent, allowing the pollen tube to emerge. Cellulose and pectin are associated mainly with the intine, not the exine.
Frequently asked questions
What is the correct answer to this question?
Sporopollenin
Why is this the correct answer?
Sporopollenin is the main material of the pollen exine and is highly resistant to decomposition, desiccation, enzymes, and environmental stress. This durable layer protects pollen during transport. Germ pores are regions where exine is thin or absent, allowing the pollen tube to emerge. Cellulose and pectin are associated mainly with the intine, not the exine.
Which subject and chapter does this question cover?
This is a Class 11 Biology question. Chapter: Morphology of Flowering Plants. Topic: flowers.
