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Microsporogenesis

Which of the ...

Question

Which of the following is NOT correct regarding a pollen grain.

A

Germ pores are regions in exine that lack exine and sporopollenin.

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B

Hard outer layer of pollen is called Exine

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C

There are no pores present on exine.

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D

Sporopollenin is a material highly resistant to strong acids.

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Solution

The correct option is C
There are no pores present on exine.

Pollen grain has two layers- exine and intine. The exine, which is the outer covering , is made up of sporopollenin. The exine has minute pores on its surface called germ pores through which pollen tube generates. Germ pores or germinal furrows are regions in exine that lack sporopollenin. Pollen grain germinates through the germ spores to initiate the pollen tube

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Similar questions

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

Q. 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.

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