Select the correct statement

Options

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

Answer

To solve the question "Select the correct statement," we need to analyze each of the four statements provided:

1. **Statement 1: Salvinia, Ginkgo, and Pinus all are Gymnosperms.**
- **Analysis:** Salvinia is actually a pteridophyte, not a gymnosperm. Ginkgo and Pinus are indeed gymnosperms. Therefore, this statement is incorrect.

2. **Statement 2: Sequoia is one of the tallest trees.**
- **Analysis:** This statement is true. Sequoia, also known as the redwood tree, is recognized as one of the tallest tree species in the world. Thus, this statement is correct.

3. **Statement 3: The leaves of Gymnosperms are not well adapted to extremes of climate.**
- **Analysis:** This statement is incorrect. Gymnosperms have leaves that are well adapted to extreme climates, which is one of their defining characteristics. Therefore, this statement is false.

4. **Statement 4: Gymnosperms are both homosporous and heterosporous.**
- **Analysis:** This statement is also incorrect. Gymnosperms are primarily heterosporous, meaning they produce two types of spores (microspores and megaspores). They are not homosporous. Thus, this statement is false.

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

### Step-by-Step Solution:
1. Analyze each statement individually.
2. Identify the classification of Salvinia, Ginkgo, and Pinus.
3. Confirm the height of Sequoia.
4. Evaluate the adaptation of gymnosperm leaves to climate.
5. Determine the spore type in gymnosperms.
6. Conclude which statement is correct.