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In Pinus, the pollen grain has 6 chromosomes then in its endosperm will have

1. 12
2. 18
3. 6
4. 24

Correct answer: 18

Solution

If the pollen grain has 6 chromosomes, then the haploid number n = 6. In Pinus, the nutritive tissue in the seed is formed after fertilization and is triploid in this question’s context, so it has 3n chromosomes = 18.

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