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Gymnosperms

Which of the ...

Question

Which of the following structures are haploid in gymnosperms?

A

Pollen grain, megaspore, embryo

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B

Pollen grain, megaspore, endosperm

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C

Megaspore, leaf, root

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D

Leaf, root, integument

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Solution

The correct option is D Pollen grain, megaspore, endosperm
In gymnosperms, the pollen grains and the megaspores are haploid and develop as a result of meiosis in the respective mother cells. The functional megaspore forms the embryo sac. The endosperm is formed prior to fertilisation and hence is haploid.
So, the correct answer is 'Pollen grain, megaspore, endosperm'

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Q. Assertion :Megaspore mother cell undergoes meiosis to produce four megaspores. Reason: Megaspore mother cells and megaspores both are haploid.

Q. Assertion : The megaspore mother cell divides mitotically to produce four spores.
Reason : Megaspore mother cells are diploid and megaspore is haploid.

Q. Which of the following structures are found in the ovule even before the megaspore is formed?
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II) Egg cell
III) Funicle
IV) Polar nuclei

Q. How many pollen grains and ovules are likely to be formed in the anther and the ovary of an angiosperm bearing 25 microspore mother cells and megaspore mother cells respectively?

Q. How many chromosomes are present in each of the following with respect to Maize plant respectively.
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(b) Antipodal cell
(c) Endosperm cell
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(f) Megaspore
(g) Microspore mother cell.

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