Question

Which one of the following is a triploid cell ?

• A. Zygote
• B. Central cell
• C. Primary endosperm cell
• D. Synergid

Hint:

Endosperm = \textbf{3}n (Triple fusion). Most other structures in the embryo sac are \textbf{1}n, and the zygote is \textbf{2}n.

Answer 1

The Correct Option is C

Step 1 : Understanding the Question
This question identifies the cell type in an angiosperm that contains three sets of chromosomes (3n).
Step 2 : Key Formulas and approach
The approach is based on "Double Fertilization": 1. $\text{Egg}(n) + \text{Sperm}(n) = 2n$. 2. $\text{Polar nuclei}(n+n) + \text{Sperm}(n) = 3n$.
Step 3 : Detailed Explanation

Synergids (A): These are (A) haploid (n).

Central Cell (B): Before fusion, it is (B) dikaryotic ($n+n$).

Zygote (C): The product of syngamy, which is (C) diploid ($2n$).

PEC (D): Triple fusion produces a triploid nucleus in the (D) Primary Endosperm Cell.

Step 4 : Final Answer
The PEC is triploid. Thus, option (D) is correct.