Which of the following statement(s) regarding double fertilisation is/are correct?
I. It takes place inside the embryo sac.
II. It is syngamy+triple fusion.
III. It is demonstrated by Nawaschin in 1898 in Lilium.

Options

A. I and II
B. Only III
C. II and III
D. All of these

Answer

To determine which statements regarding double fertilization are correct, let's analyze each statement step by step.

### Step-by-Step Solution:

1. **Understanding Double Fertilization**:
- Double fertilization is a unique process in flowering plants (angiosperms) where two fertilization events occur.
- One male gamete (sperm) fuses with the egg cell to form the zygote (this process is called syngamy).
- The second male gamete fuses with two polar nuclei to form the triploid endosperm (this process is called triple fusion).

2. **Analyzing Statement I**:
- **Statement I**: "It takes place inside the embryo sac."
- **Evaluation**: This statement is correct. Double fertilization occurs within the embryo sac of the ovule.

3. **Analyzing Statement II**:
- **Statement II**: "It is syngamy + triple fusion."
- **Evaluation**: This statement is also correct. Double fertilization involves both syngamy (fusion of the sperm with the egg) and triple fusion (fusion of the second sperm with the two polar nuclei).

4. **Analyzing Statement III**:
- **Statement III**: "It is demonstrated by Nawaschin in 1898 in Lilium."
- **Evaluation**: This statement is correct as well. The process of double fertilization was indeed demonstrated by the scientist Nawaschin in 1898 using the plant Lilium.

### Conclusion:
All three statements are correct. Therefore, the correct answer is that all statements regarding double fertilization are correct.

### Final Answer:
I, II, and III are correct.

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