20 Questions
Which layer of the pollen grain is made up of sporopollenin, a highly resistant organic material?
The outer wall
What is the function of the germ pore in the pollen grain exine?
To facilitate germination
What is the composition of the inner wall of the pollen grain?
Cellulose and pectin
What is the size range of pollen grains?
25-50 micrometers
Why are pollen grains well-preserved as fossils?
Due to the presence of sporopollenin
True or false: Pollen grains are generally spherical in shape?
True
True or false: The exine of pollen grains is made up of sporopollenin?
True
True or false: Sporopollenin can withstand high temperatures and strong acids and alkali?
True
True or false: No enzyme that degrades sporopollenin is known?
True
True or false: The inner wall of the pollen grain is called the exine?
False
True or false: The exine of pollen grains is made up of sporopollenin?
True
True or false: The inner wall of the pollen grain is called the intine?
False
True or false: No enzyme that degrades sporopollenin is known?
True
True or false: Pollen grains are generally spherical in shape?
True
True or false: Sporopollenin can withstand high temperatures and strong acids and alkali?
True
Why is the exine of pollen grains hard?
The exine of pollen grains is hard to provide protection and prevent desiccation.
What is the function of the germ pore in the pollen grain exine?
The germ pore in the pollen grain exine allows for the release of the male gametes during pollination.
What is the composition of the inner wall of the pollen grain?
The inner wall of the pollen grain is made up of cellulose and pectin.
What is the size range of pollen grains?
Pollen grains generally measure about 25-50 micrometers in diameter.
What is the outer layer of the pollen grain called?
The outer layer of the pollen grain is called the exine.
Study Notes
Pollen Grain Structure
- The outer layer of the pollen grain, called the exine, is made up of sporopollenin, a highly resistant organic material.
Exine Composition
- The exine is composed of sporopollenin, which can withstand high temperatures and strong acids and alkali.
- No enzyme that degrades sporopollenin is known.
Intine Composition
- The inner wall of the pollen grain is called the intine, and its composition is different from the exine.
Pollen Grain Characteristics
- Pollen grains are not generally spherical in shape.
- The size range of pollen grains varies.
- Pollen grains are well-preserved as fossils due to the resistant nature of sporopollenin.
Germ Pore Function
- The germ pore in the pollen grain exine serves a function related to plant reproduction.
Exine Hardness
- The exine of pollen grains is hard due to the presence of sporopollenin.
Test your knowledge about pollen grains and their unique features with this quiz. Learn about the composition of the two-layered wall, the durability of the outer layer, and more.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
