Suppose in a flower of mustard, each microsporangium posses 20 pollen mother cell then the total number of male gametes formed by this flower will be

Options

A. 3840
B. 480
C. 240
D. 120

Answer

To find the total number of male gametes formed by a flower of mustard, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Number of Pollen Mother Cells (PMCs)**:
- In the given problem, each microsporangium possesses 20 pollen mother cells.

2. **Calculate the Number of Pollen Grains from PMCs**:
- Each pollen mother cell (PMC) produces 4 pollen grains.
- Therefore, for 20 PMCs:
\[ \text{Total Pollen Grains} = 20 \, \text{PMCs} \times 4 \, \text{pollen grains/PMC} = 80 \, \text{pollen grains} \]

3. **Determine the Number of Male Gametes from Pollen Grains**:
- Each pollen grain produces 2 male gametes.
- Thus, from 80 pollen grains:
\[ \text{Total Male Gametes} = 80 \, \text{pollen grains} \times 2 \, \text{male gametes/pollen grain} = 160 \, \text{male gametes} \]

4. **Account for the Number of Microsporangia**:
- In a mustard flower, there are 4 microsporangia.
- Therefore, the total number of male gametes from all microsporangia is:
\[ \text{Total Male Gametes from Microsporangia} = 160 \, \text{male gametes} \times 4 \, \text{microsporangia} = 640 \, \text{male gametes} \]

5. **Consider the Number of Stamens in the Flower**:
- A mustard flower typically has 6 stamens.
- Hence, the total number of male gametes produced by the flower is:
\[ \text{Total Male Gametes in One Flower} = 640 \, \text{male gametes} \times 6 \, \text{stamens} = 3840 \, \text{male gametes} \]

### Final Answer:
The total number of male gametes formed by one flower of mustard is **3840**.

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