Which is/are correct statement/s?

Options

A. In flowering plants, tracheids and vessels are the main water transporting elements.
B. In gymnosperms, tracheids are the chief water transporting elements
C. The companion cells play an important role in the maintenance of a pressure gradient in the sieve tubes
D. All of these

Answer

To solve the question regarding which statements are correct, we will analyze each statement one by one.

**Step 1: Analyze the first statement.**
- The first statement claims that in flowering plants, tracheids and vessels are the main transporting elements.
- In angiosperms (flowering plants), vessels are indeed the primary water-conducting elements, while tracheids also play a role in water transport, albeit to a lesser extent.
- Therefore, this statement is **correct**.

**Step 2: Analyze the second statement.**
- The second statement asserts that in gymnosperms, tracheids are the chief water transporting elements.
- In gymnosperms, tracheids are indeed the primary water-conducting elements, as they lack vessels.
- Thus, this statement is also **correct**.

**Step 3: Analyze the third statement.**
- The third statement indicates that companion cells play an important role in the maintenance of pressure gradient.
- Companion cells are essential for the functioning of sieve tubes, as they help maintain the pressure gradient necessary for the transport of sugars (like sucrose) from source to sink.
- Hence, this statement is **correct** as well.

**Conclusion:**
Since all three statements are correct, the answer to the question is that all of the above statements are correct.

**Final Answer: All of the above statements are correct.**

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