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Role of Abscisic Acid

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Question

Go through the following statements regarding a substance which enable pollen grain to tolerate in extremely adverse condition and choose correct option.
I. It form the exine of pollen grain.
II. It is one of the resistant organic material.
III.It contain a aperture called germ pore where it is present.
IV. It can withstand high temperatures and strong acids.
V. Still new no enzyme has been discovered which can degrade it.

A

All statements are correct and belong to sporopollenin.

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B

All statements are correct and belong to lignin.

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C

Statements I, II, Ill and IV are correct and belong to sporopollenin.

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D

Statements I, II, IV and are correct and belong to sporopollenin.

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Solution

The correct option is C Statements I, II, Ill and IV are correct and belong to sporopollenin.
Sporopollenin is one of the most chemically inert organic material. It forms the tough outer exine of pollen grain and spores. It is contained within an aperture called germ pore. Being chemically inert it can withstand strong acids and high temperatures also.
Hence, the correct answer is option C.

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Similar questions

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. 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. Consider the following statements with respect to pollen grains.
(a) Exine is thin, continuous layer made up of cellulose and pectin
(b) Hard outer layer called exine is made of sporopollenin
(c) Sporopollenin is present in germ pores
(d) Exine exhibits a fascinating array of patterns and designs. Of the statements.

Q. Assertion :Exine of a pollen grain is made up of sporopollenin which is resistant to high temperature, strong acid or alkali as well as enzymatic degradation. Reason: Sporopollenin is absent in the region of germ pores.

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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