Female gametophyte in conifers and cycas is `:`

Options

A. Haploid embryo sac
B. Diploid nucellus
C. Haploid endosperm
D. Triploid endosperm

Answer

To determine the female gametophyte in conifers and Cycas, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Type of Plants**:
- Conifers and Cycas are both classified as gymnosperms. Gymnosperms are non-flowering plants that produce seeds that are not enclosed in an ovary.

2. **Understand Female Gametophyte Formation**:
- In gymnosperms, the female gametophyte develops from a megaspore. The megaspore undergoes mitotic divisions to form the female gametophyte.

3. **Recognize the Nature of Endosperm**:
- In gymnosperms, the endosperm is haploid. This is because it is formed from the repeated divisions of the haploid megaspore, and it is not a result of fertilization.

4. **Differentiate Between Angiosperms and Gymnosperms**:
- In angiosperms (flowering plants), the endosperm is typically triploid and results from double fertilization. However, in gymnosperms like conifers and Cycas, the endosperm is haploid.

5. **Select the Correct Option**:
- Based on the above understanding, the female gametophyte in conifers and Cycas is best represented by the term "haploid endosperm".

### Final Answer:
The female gametophyte in conifers and Cycas is **haploid endosperm**.

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