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Asked by surabhilakhara7299 | 19 Aug, 2021, 04:28: PM
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In Pinus, endosperm cells have 15 chromosomes then how many chromosomes are present in sieve cells?

Sieve cells are specialized cells that are important for the function of phloem. The sieve cells form the part of the phloem which is a highly organized tissue and functions in the transportation of organic compounds made during photosynthesis. The sieve cells in the gymnosperms do not contain companion cells. The sieve cells in gymnosperms are diploid or 2n.

In Pinus, endosperm is formed before the process of fertilization. It is the result of pre-fertilization tissues. As it is formed without fertilization, endosperm is haploid. It is the same as that of the female gametophyte and so it is haploid and contains a number of chromosomes. Hence, if the endosperm in Pinus is haploid(n) with 15 chromosomes, the sieve cells will have 30 chromosomes as it is diploid or 2n.
Answered by Sheetal Kolte | 23 Aug, 2021, 12:29: PM

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