The total number of nuclei involved in double fertilisation in angiosperms are

Options

A. two
B. three
C. four
D. five

Explanation

To determine the total number of nuclei involved in double fertilization in angiosperms, we need to analyze the process step by step.

### Step-by-Step Solution:

1. **Understanding Double Fertilization**: In angiosperms, double fertilization involves the fusion of two male gametes with two different structures in the ovule.

2. **Identifying the Components**:
- **Male Gametes**: Each pollen grain contains two male gametes produced from the generative cell.
- **Central Cell**: This is formed by the fusion of two polar nuclei and is diploid.
- **Egg Cell**: The egg cell is haploid.

3. **Counting the Nuclei**:
- **From Male Gametes**: There are 2 male gametes (each haploid, contributing 1 nucleus each).
- **From Central Cell**: The central cell has 2 polar nuclei (which fuse to form a triploid endosperm).
- **From Egg Cell**: The egg cell contributes 1 nucleus (haploid).

4. **Calculating Total Nuclei**:
- Male Gametes: 2 nuclei (1 from each gamete)
- Central Cell: 2 nuclei (from the fusion of the two polar nuclei)
- Egg Cell: 1 nucleus

Therefore, the total number of nuclei involved in double fertilization is:
\[ 2 \text{ (from male gametes)} + 2 \text{ (from central cell)} + 1 \text{ (from egg cell)} = 5 \text{ nuclei} \]

5. **Conclusion**: The total number of nuclei involved in double fertilization in angiosperms is **5**.

### Final Answer:
The total number of nuclei involved in double fertilization in angiosperms is **5**.

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