Question

What will be the fate of polar nuclei after fertilisation ?

Hint:

Ploidy level is a frequent exam trap!
Egg/Sperm = \(n\).
Zygote = \(2n\).
Endosperm = \(3n\).

Answer 1

Step 1: Understanding the Concept:
Angiosperms undergo a unique process called "Double Fertilization."
Step 2: Detailed Explanation:
There are two polar nuclei located in the large central cell.
During fertilization, one of the two male gametes travels to the center of the embryo sac and fuses with these two polar nuclei.
Since this involves the fusion of three haploid nuclei ($n + n + n$), it is called Triple Fusion.
The resulting cell is triploid (\(3n\)) and is called the Primary Endosperm Cell (PEC), containing the Primary Endosperm Nucleus (PEN).
This tissue grows into the Endosperm, which stores nutrients to feed the developing embryo.
Step 3: Final Answer:
The polar nuclei develop into the triploid endosperm, which serves as a nutritive tissue for the embryo.