In angiosperms, double fertillization means

Options

A. Fusion of egg cell with male gamete
B. Fusion of secondary nucleus with male gamete
C. Both the above
D. None the above

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 that happen simultaneously within the ovule.

2. **Pollen Tube Formation**: When a pollen grain lands on the stigma of a flower, it germinates and forms a pollen tube. This tube grows down through the style and enters the ovule through an opening called the micropyle.

3. **Male Gametes**: The pollen tube carries two male gametes (sperm cells) to the ovule.

4. **First Fertilization Event**: One of the male gametes fuses with the egg cell (female gamete). This fusion results in the formation of a diploid zygote (2n), which will eventually develop into the embryo of the seed.

5. **Second Fertilization Event**: The second male gamete fuses with the two polar nuclei present in the central cell of the ovule. This fusion creates a triploid cell (3n), which will develop into the endosperm, providing nourishment to the developing embryo.

6. **Conclusion**: Therefore, double fertilization in angiosperms refers to the two fertilization events: one leading to the formation of the embryo and the other leading to the formation of the endosperm.

7. **Answering the Question**: Based on the explanation, the correct answer to the question "In angiosperms, double fertilization means" is that it involves the fusion of the male gamete with the egg cell and the fusion of another male gamete with the polar nuclei. Thus, the correct option is "both of the above."