In angiosperms since two types of fusions, syngamy and triple fusion take place in __________ the phenomenon is termed double fertilisation.

Options

A. embryosac
B. ovary
C. ovule
D. seed

Answer

**Step-by-Step Solution:**

1. **Understanding Angiosperms**: Angiosperms are flowering plants that produce seeds enclosed within a fruit. This characteristic distinguishes them from gymnosperms, which have naked seeds.

2. **Defining Double Fertilization**: In angiosperms, a unique process called double fertilization occurs. This involves two types of fertilization events: syngamy and triple fusion.

3. **Identifying Syngamy**: Syngamy refers to the fusion of a male gamete (from the pollen grain) with a female gamete (the egg cell) to form a zygote. This is the first fertilization event.

4. **Identifying Triple Fusion**: Triple fusion occurs when another male gamete fuses with the two polar nuclei present in the embryo sac. This fusion results in the formation of the primary endosperm nucleus, which is triploid (3n).

5. **Location of the Processes**: Both syngamy and triple fusion take place in the embryo sac of the ovule. This is the structure where fertilization occurs.

6. **Conclusion**: Since both syngamy and triple fusion occur in the embryo sac, the phenomenon is termed double fertilization.

**Final Answer**: In angiosperms, since two types of fusions, syngamy and triple fusion take place in **the embryo sac**, the phenomenon is termed double fertilization.

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