Which of the following statements is incorrect about gymnosperms?

Options

A. They are heterosporous
B. Male and female gametophytes are free living
C. Most of them have narrow leaves with thick cuticle
D. Their seeds are not covered

Answer

To determine which statement is incorrect about gymnosperms, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Gymnosperms**:
- Gymnosperms are a group of seed-producing plants that include conifers, cycads, and ginkgo. They are characterized by having seeds that are not enclosed in an ovary (naked seeds).

2. **Evaluating Statement A**:
- **Statement A**: "They are heterosporous."
- **Analysis**: Gymnosperms are indeed heterosporous, meaning they produce two types of spores: microspores (male) and megaspores (female). This statement is **correct**.

3. **Evaluating Statement B**:
- **Statement B**: "Male and female gametophytes are free living."
- **Analysis**: This statement is **incorrect**. In gymnosperms, male and female gametophytes do not live freely; instead, they develop within the sporangia. Therefore, this statement is the one we are looking for.

4. **Evaluating Statement C**:
- **Statement C**: "Most of them have narrow leaves with thick cuticles."
- **Analysis**: This statement is **correct**. Many gymnosperms, especially conifers, have narrow leaves that are adapted to reduce water loss, often covered with a thick cuticle.

5. **Evaluating Statement D**:
- **Statement D**: "Their seeds are not enclosed."
- **Analysis**: This statement is also **correct**. Gymnosperms are known for having seeds that are not enclosed by an ovary wall, which is why they are referred to as "naked seeds."

### Conclusion:
The incorrect statement about gymnosperms is **Statement B**: "Male and female gametophytes are free living."