If one set of chromosomes for a given plant is represented as N; in ca

If one set of chromosomes for a given plant is represented as N; in case of double fertilization, the zygote and the endosperm nucleus of a diploid plant would have how many sets of chromosomes respectively?

N and 2N

2N and 2N

N and 3N

2N and 3N

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC NDA-2 – 2018

Download PDF Attempt Online

In double fertilization in a diploid plant (where N represents the haploid set of chromosomes), the zygote is formed by the fusion of a haploid male gamete (N) and a haploid egg cell (N), resulting in a diploid zygote (2N). The endosperm nucleus is typically formed by the fusion of a haploid male gamete (N) with the diploid central cell (usually containing two haploid polar nuclei, N+N=2N), resulting in a triploid primary endosperm nucleus (N + 2N = 3N).

– Double fertilization is a unique process in flowering plants involving two sperm cells.
– One sperm cell fertilizes the egg to form the diploid zygote (embryo).
– The other sperm cell fertilizes the central cell of the embryo sac to form the primary endosperm nucleus.
– In most diploid angiosperms, the central cell contains two polar nuclei, both usually haploid (N). Their fusion with a haploid sperm (N) results in a triploid (3N) endosperm.

The zygote develops into the embryo. The primary endosperm nucleus develops into the endosperm, which serves as nutritive tissue for the developing embryo. The ploidy level of the central cell can vary in some species, potentially leading to different ploidy levels for the endosperm.

Join Our Telegram Channel

More similar MCQ questions for Exam preparation:-