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

Answer

To solve the question "Select the correct statement," we need to analyze each of the four statements provided regarding Gymnosperms and related plants.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- **Statement:** Gymnosperms are both homosporous and heterosporous.
- **Analysis:** Gymnosperms are primarily heterosporous, meaning they produce two types of spores: microspores (male) and megaspores (female). Therefore, this statement is incorrect.

2. **Analyze the Second Statement:**
- **Statement:** Salvinia, Ginkgo, and Pinus all are Gymnosperms.
- **Analysis:** Salvinia is not a Gymnosperm; it is a genus of aquatic ferns (Pteridophytes). Ginkgo and Pinus are indeed Gymnosperms. Therefore, this statement is incorrect.

3. **Analyze the Third Statement:**
- **Statement:** Sequoia is one of the tallest trees.
- **Analysis:** This statement is true. Sequoia trees are known to be among the tallest trees in the world, and they belong to the Gymnosperms. Therefore, this statement is correct.

4. **Analyze the Fourth Statement:**
- **Statement:** The leaves of Gymnosperms are not well adapted to extremes of climate.
- **Analysis:** This statement is incorrect. The leaves of Gymnosperms are typically well adapted to withstand extreme climatic conditions, including temperature fluctuations and humidity. They often have thick cuticles and other adaptations to reduce water loss.

### Conclusion:
The correct statement among the four provided is the third statement: **"Sequoia is one of the tallest trees."**

---