Endosperm is formed during the double fertilization by

Options

A. Two polar nuclei and one male gamete
B. One polar nuclei and one male gamete
C. Ovum and male gamete
D. Two polar nuclei and two male gametes

Answer

**Step-by-Step Solution:**

1. **Understanding Double Fertilization**: Double fertilization is a unique process that occurs in angiosperms (flowering plants). It involves two fertilization events within the ovule.

2. **Components Involved**: During double fertilization, one male gamete fuses with the ovum to form the zygote, while the other male gamete fuses with two polar nuclei to form the endosperm.

3. **Formation of Endosperm**: The endosperm is formed when one male gamete combines with the two polar nuclei. This results in a triploid nucleus, which is referred to as triploid endosperm.

4. **Analyzing the Options**:
- **Option A**: Two polar nuclei and one male gamete - This is correct because it describes the formation of the endosperm.
- **Option B**: One polar nucleus and one male gamete - This is incorrect as it does not account for both polar nuclei.
- **Option C**: Ovum and male gamete - This describes the formation of the zygote, not the endosperm.
- **Option D**: Two polar nuclei and two male gametes - This is incorrect as only one male gamete is involved in forming the endosperm.

5. **Conclusion**: The correct answer is **Option A**: Two polar nuclei and one male gamete.

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