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Male Gametophyte

Assertion: Po...

Question

Assertion: Pollen grains are well preserved as fossils.
Reason: The outer layer of pollen grains called the exine is made up of sporopollenin.

A

Both assertion and reason are true and reason is the correct explanation of assertion.

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B

Both assertion and reason are true but reason is not the correct explanation of assertion.

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C

The assertion is true but reason is false.

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D

Both assertion and reason are false.

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Solution

The correct option is A Both assertion and reason are true and reason is the correct explanation of assertion.
Pollen grains are well preserved as fossils because their outer wall exine is made up of a highly resistant organic material called sporopollenin.
Sporopollenin is able to withstand high temperatures and strong acids and alkali. It cannot be degraded by any enzyme known so far.
Therefore, both assertion and reason are true and reason is the correct explanation of assertion.

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Similar questions

Q. Assertion: Pollen grains are well preserved as fossils.
Reason: The outer layer of pollen grains called the exine is made up of sporopollenin.

Q. Identify the pair of wrong statements in the following.
I) Intine of pollen grain is made up of sporopollenin.
II) Pollen grains are well preserved as fossils because of the presence of sporopollenin.
III) Enzymes can degrade the organic material of the exine of pollen grain.
IV) Sporopollenin can withstand high temperatures, strong acids and alkali.

Q. Assertion :Pollen grains can be well preserved and used as microfossils. Reason: In certain places on pollen grains exine is absent and they have a thick layer of intine at these places.

Q. Choose the correct statement(s) regarding pollen grains.
I. Pollen grains are the male gametes of the flowering plant.
II. Pollen grain has a prominent two-layered wall.
III. The outer thick wall of pollen grain is called exine and the inner thin wall is called intine.
IV. The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic materials known.

Q. Identify the pair of wrong statements.
I. Intine of pollen grains is made up of sporopollenin.
II. Pollen grains are well preserved as fossils because of the presence of sporopollenin.
III. Enzymes can degrade the organic material of the pollen grain exine.
IV. Sporopollenin can withstand high temperature, strong acids and alkali.

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Male Gametophyte

Standard XII Biology

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