Select the correct statement

Options

A. Gymnosperms are both homosporous and heterosporous
B. Salvinia, Ginkgo and Pinus all are gymnosperms
C. Sequoia is one of the tallest trees
D. The leaves of gymnosperms are not well adapted to extremes of climate

Explanation

To solve the question of selecting the correct statement regarding Gymnosperms, we will analyze the provided statements step by step.

### Step-by-Step Solution:

1. **Understanding Homosporous and Heterosporous:**
- **Homosporous**: This term refers to plants that produce one type of spore, which develops into a gametophyte that can produce both male and female gametes (monoecious).
- **Heterosporous**: This refers to plants that produce two different types of spores: microspores (male) and megaspores (female), leading to the formation of separate male and female gametophytes (dioecious).

**Hint**: Remember the definitions of homosporous and heterosporous to differentiate between the types of spore production.

2. **Evaluating the First Statement:**
- The statement claims that Gymnosperms are both homosporous and heterosporous. This is incorrect because Gymnosperms are primarily heterosporous. Therefore, this statement is false.

**Hint**: Focus on the characteristics of Gymnosperms to determine their spore type.

3. **Analyzing the Second Statement:**
- The second statement mentions Sequoia (redwood) as one of the tallest trees. This is true; Sequoia trees are indeed known for their height and are commonly referred to as redwoods due to the color of their wood.

**Hint**: Recall the significance of Sequoia trees in terms of height and their common name.

4. **Evaluating the Third Statement:**
- The third statement discusses the adaptation of Gymnosperms' leaves to extreme climates. It states that Gymnosperms have needle-like leaves that reduce water loss and have a cuticle to help conserve water. This is correct, as needle-like leaves are indeed an adaptation to reduce surface area and minimize water loss.

**Hint**: Think about how plant adaptations help them survive in harsh environments.

5. **Conclusion:**
- The first statement is incorrect.
- The second statement is correct.
- The third statement is also correct.

Thus, the correct statements are the second and third ones regarding the Sequoia tree and the adaptation of Gymnosperms' leaves.

### Final Answer:
The correct statements are:
- Sequoia is one of the tallest trees known as redwood.
- Leaves of Gymnosperms are well adapted to extreme climates.