Podcast
Questions and Answers
Which layer of the pollen grain is made up of sporopollenin, a highly resistant organic material?
Which layer of the pollen grain is made up of sporopollenin, a highly resistant organic material?
- The intine
- The outer wall (correct)
- The germ pore
- The inner wall
What is the function of the germ pore in the pollen grain exine?
What is the function of the germ pore in the pollen grain exine?
- To allow entry of water
- To facilitate germination (correct)
- To prevent pollen grain from drying out
- To protect the cytoplasm
What is the composition of the inner wall of the pollen grain?
What is the composition of the inner wall of the pollen grain?
- Plasma membrane
- Cytoplasm
- Sporopollenin
- Cellulose and pectin (correct)
What is the size range of pollen grains?
What is the size range of pollen grains?
Why are pollen grains well-preserved as fossils?
Why are pollen grains well-preserved as fossils?
True or false: Pollen grains are generally spherical in shape?
True or false: Pollen grains are generally spherical in shape?
True or false: The exine of pollen grains is made up of sporopollenin?
True or false: The exine of pollen grains is made up of sporopollenin?
True or false: Sporopollenin can withstand high temperatures and strong acids and alkali?
True or false: Sporopollenin can withstand high temperatures and strong acids and alkali?
True or false: No enzyme that degrades sporopollenin is known?
True or false: No enzyme that degrades sporopollenin is known?
True or false: The inner wall of the pollen grain is called the exine?
True or false: The inner wall of the pollen grain is called the exine?
True or false: The exine of pollen grains is made up of sporopollenin?
True or false: The exine of pollen grains is made up of sporopollenin?
True or false: The inner wall of the pollen grain is called the intine?
True or false: The inner wall of the pollen grain is called the intine?
True or false: No enzyme that degrades sporopollenin is known?
True or false: No enzyme that degrades sporopollenin is known?
True or false: Pollen grains are generally spherical in shape?
True or false: Pollen grains are generally spherical in shape?
True or false: Sporopollenin can withstand high temperatures and strong acids and alkali?
True or false: Sporopollenin can withstand high temperatures and strong acids and alkali?
Why is the exine of pollen grains hard?
Why is the exine of pollen grains hard?
What is the function of the germ pore in the pollen grain exine?
What is the function of the germ pore in the pollen grain exine?
What is the composition of the inner wall of the pollen grain?
What is the composition of the inner wall of the pollen grain?
What is the size range of pollen grains?
What is the size range of pollen grains?
What is the outer layer of the pollen grain called?
What is the outer layer of the pollen grain called?
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.
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Description
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.
