How many nuclei are present in the embryo sac | vedclass

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Question

(A) Before fertilization, a mature embryo sac (polygonum type) contains $7$ cells and $8$ nuclei.After fertilization, the following events occur:$1$.

Vedclass · Accepted Answer

$7$

Vedclass · Answer

(A) Before fertilization, a mature embryo sac (polygonum type) contains $7$ cells and $8$ nuclei.After fertilization, the following events occur:$1$. The egg cell fuses with one male gamete to form a diploid zygote $(2n)$, which contains $1$ nucleus.$2$. The central cell, which contains two polar nuclei, fuses with the second male gamete to form a primary endosperm nucleus $(PEN)$, which is triploid $(3n)$ and contains $1$ nucleus.$3$. The three antipodal cells and two synergids usually degenerate.However, the question asks for the total number of nuclei present in the embryo sac structure. The $PEN$ ($1$ nucleus) and the zygote ($1$ nucleus) are present. The degenerating synergids and antipodal cells still contain their nuclei for a period. Specifically, the $PEN$ is $1$ nucleus, the zygote is $1$ nucleus, the $3$ antipodal cells have $3$ nuclei, and the $2$ synergids have $2$ nuclei.Total nuclei = $1 (PEN) + 1 (Zygote) + 3 (Antipodals) + 2 (Synergids) = 7$ nuclei.

How many nuclei are present in the embryo sac after fertilization?

Similar Questions

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