Double fertilization occurs in

Options

A. Pinus
B. Selaginella
C. Funaria
D. Dalbergia/Capsella.

Answer

**Step-by-Step Solution:**

1. **Understanding Double Fertilization**:
- Double fertilization is a unique process that occurs in flowering plants, known as angiosperms. It involves two fertilization events that happen simultaneously.

2. **Identifying the Components**:
- In the pollen grain of angiosperms, there are two male gametes. These gametes play crucial roles during fertilization.

3. **First Fertilization Event**:
- The first male gamete fuses with the female gamete (egg cell) present in the embryo sac. This fusion results in the formation of a diploid zygote.

4. **Second Fertilization Event (Triple Fusion)**:
- The second male gamete fuses with the two polar nuclei in the central cell of the embryo sac. This fusion is referred to as triple fusion because three nuclei are involved (two from the central cell and one from the male gamete), resulting in the formation of a primary endosperm cell.

5. **Development of Structures**:
- After fertilization, the zygote undergoes mitosis to develop into the embryo, while the primary endosperm cell also undergoes mitosis to form the endosperm, which serves as a nutritive tissue for the developing embryo.

6. **Identifying the Correct Answer**:
- The question asks which plants exhibit double fertilization. Since this process is characteristic of angiosperms, we need to identify the options provided.
- The options include Pinus (a gymnosperm), Selaginella (a lycophyte), and Funeria (a moss), none of which are angiosperms. The correct answer is Delbergia capsula, which is an angiosperm.

7. **Conclusion**:
- Therefore, the correct answer to the question "Double fertilization occurs in" is Delbergia capsula (option number 4).

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