In which of the following endosperm is haploid?

Grass

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Pinus

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Tulip

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All of the above

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Solution

The correct option is B Pinus
In Pinus, the microspore mother cell in the microsporangia produces the haploid pollen grains. The series of the developmental process leads to the formation of the seed. The nutritive tissues (endosperm) inside the seed are haploid body cells of the female gametophyte and the embryonic conifer is new diploid sporophyte.
Thus, the correct answer is option B.

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