Pollen Grains
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Questions and Answers

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?

  • 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?

  • Plasma membrane
  • Cytoplasm
  • Sporopollenin
  • Cellulose and pectin (correct)

    • What is the size range of pollen grains?

    <p>25-50 micrometers</p> Signup and view all the answers

    Why are pollen grains well-preserved as fossils?

    <p>Due to the presence of sporopollenin</p> Signup and view all the answers

    True or false: Pollen grains are generally spherical in shape?

    <p>True</p> Signup and view all the answers

    True or false: The exine of pollen grains is made up of sporopollenin?

    <p>True</p> Signup and view all the answers

    True or false: Sporopollenin can withstand high temperatures and strong acids and alkali?

    <p>True</p> Signup and view all the answers

    True or false: No enzyme that degrades sporopollenin is known?

    <p>True</p> Signup and view all the answers

    True or false: The inner wall of the pollen grain is called the exine?

    <p>False</p> Signup and view all the answers

    True or false: The exine of pollen grains is made up of sporopollenin?

    <p>True</p> Signup and view all the answers

    True or false: The inner wall of the pollen grain is called the intine?

    <p>False</p> Signup and view all the answers

    True or false: No enzyme that degrades sporopollenin is known?

    <p>True</p> Signup and view all the answers

    True or false: Pollen grains are generally spherical in shape?

    <p>True</p> Signup and view all the answers

    True or false: Sporopollenin can withstand high temperatures and strong acids and alkali?

    <p>True</p> Signup and view all the answers

    Why is the exine of pollen grains hard?

    <p>The exine of pollen grains is hard to provide protection and prevent desiccation.</p> Signup and view all the answers

    What is the function of the germ pore in the pollen grain exine?

    <p>The germ pore in the pollen grain exine allows for the release of the male gametes during pollination.</p> Signup and view all the answers

    What is the composition of the inner wall of the pollen grain?

    <p>The inner wall of the pollen grain is made up of cellulose and pectin.</p> Signup and view all the answers

    What is the size range of pollen grains?

    <p>Pollen grains generally measure about 25-50 micrometers in diameter.</p> Signup and view all the answers

    What is the outer layer of the pollen grain called?

    <p>The outer layer of the pollen grain is called the exine.</p> Signup and view all the answers

    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.

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