3 Questions
What is the outer layer of the pollen grain wall called?
Exine
What is the function of germ-pores in the pollen grain?
To allow entry of water and nutrients during germination
What is the composition of the inner wall layer, intine, in a pollen grain?
Cellulose and pectin
Study Notes
Pollen Grain Structure
- The outer layer of the pollen grain wall is called the exine.
- Germ-pores in the pollen grain are responsible for allowing the pollen tube to emerge during germination.
- The inner wall layer, intine, in a pollen grain is composed of cellulose and pectin.
Test your knowledge on the structure of a typical pollen grain, including its non-motile, haploid, unicellular nature and the characteristics of its two-layered wall, exine and sporoderm.
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