Double fertilisation in an angiosperms plant means
(a) fusion of two egg cells with two male gametes
(b) fusion of egg cell twice with male gametes
(c) fusion of one male gamete with the egg cell and the other male gamete with the synergid
(d) fusion of one male gamete with the egg cell and the other male gamete with secondary nucleus

Options

A. fusion of two egg cells with two male gametes
B. fusion of egg cell twice with male gametes
C. fusion of one male gamete with the egg cell and the other male gamete with the synergid
D. fusion of one male gamete with the egg cell and the other male gamete with secondary nucleus

Answer

To solve the question regarding double fertilization in angiosperms, we will analyze each option provided and determine which one accurately describes the process.

### Step-by-Step Solution:

1. **Understanding Double Fertilization**:
- Double fertilization is a unique process in angiosperms (flowering plants) where two fertilization events occur within the ovule.

2. **Analyzing Each Option**:
- **Option (a)**: Fusion of two egg cells with two male gametes.
- This is incorrect because there is only one egg cell in the ovule, not two.

- **Option (b)**: Fusion of an egg cell twice with male gametes.
- This is also incorrect as the egg cell fuses with only one male gamete, not twice.

- **Option (c)**: Fusion of one male gamete with the egg cell and the other male gamete with the synergid.
- This is incorrect because the second male gamete does not fuse with the synergid; it fuses with the polar nuclei (secondary nucleus).

- **Option (d)**: Fusion of one male gamete with the egg cell and the other male gamete with the secondary nucleus.
- This is correct. In double fertilization, one male gamete fuses with the egg cell to form the zygote, while the other male gamete fuses with the two polar nuclei (secondary nucleus) to form the endosperm.

3. **Conclusion**:
- The correct answer is **(d)**: fusion of one male gamete with the egg cell and the other male gamete with the secondary nucleus.