Question

Number of male gametes in the growing pollen tube is

• A. One
• B. Two
• C. Three
• D. Seven

Answer 1

The correct option is B

Two

The correct option is B

Explanation of the correct option :

1. The pollen tube consists of two male gametes.
2. One male gamete fertilizes an egg cell positioned between the egg apparatus.
3. It results in the formation of a diploid oospore/zygote, which matures into an embryo.
4. While the other male gamete combines with the central cell's two polar nuclei to produce the triploid PEN (Primary Endosperm Nucleus), the endosperm is formed after maturation.
5. In order for angiosperm plants to undergo double fertilization, the pollen tube must contain two male gametes.

Explanation of the incorrect option:

Option A:

The pollen tube consists of 2 male gametes.

Option C:

The pollen tube consists of 2 male gametes.

Option D:

The pollen tube consists of 2 male gametes.

Final answer: Number of male gametes in the growing pollen tube is two.