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Double Fertilisation

After meiosis...

Question

After meiosis within pollen sacs, haploid structures formed is called

A

Megaspores

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B

Stamens

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C

Microspores

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D

Sporophytes

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Solution

The correct option is B Microspores
Pollen sac is the structure in seed plants in which pollen is produced. Microspores are plant spores that develop into male gametophytes. The microspores develop into pollen grains each containing a reduced, multicellular male gametophyte. Each of the microsporocytes in the microsporangia undergoes meiosis, producing four haploid microspores
So the correct answer is 'microspores'

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Q. The plant parts which are haploid and present inside diploid part are:
(a) Embryo within the seed
(b) Pollen grains within the pollen sac
(c) Seed inside the fruit
(d) Female gametophyte within the ovule
(e) Male gametes within the pollen grains

Q. Assertion :In angiosperms, each cell of the embryo sac is haploid. Reason: In angiosperms, embryo sac formation is preceded by meiosis.

Q. Assertion: In angiosperms, each of the cells of an embryo-sac is haploid.
Reason: The embryo sac formation is preceded by meiosis.

Q. Assertion: If pollen mother cells has 42 chromosomes. The pollen has only 21 chromosomes.
Reason: Pollens are formed after meiosis in pollen mother cell.

Q. Assertion :Gametes are formed independently either from diploid or haploid parents. Gametes are always haploid Reason: In diploid parents, gametes are formed through mitosis and meiosis while in haploid parents it occurs through meiosis

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