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Seed Germination

The germ pore...

Question

The germ pores in the pollen grain are the regions

A

that can withstand high temperature and strong acids and alkalies

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B

through which sperms are released into the female gametophyte

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C

which are made up of lignin and suberin

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D

which lack sporopollenin

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Solution

The correct option is D
which lack sporopollenin

Germ pore is the small pore in the outer wall (exine) of the pollen grains. These are the regions which lack sporopollenin (a substance found in outer layer which is resistant to high temperature and strong acids and alkali). These germ pores help in the formation of the pollen tube and the releases male gametes during fertilisation.

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Similar questions

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.

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. Which among the following statements is correct?
(a) The vegetative cell of pollen grain divides to form the male gametes.
(b) Sporopollenin is absent in the germ pores.
(c) Intine of pollen grains is made up of cellulose and pectin.
(d) Pollen grains represent the male gametophyte.

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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