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Read the following statements about xyle...

Read the following statements about xylem elements. Which ones are true?
I. The gymnosperms lack xylem vessels, instead they possess tracheids.
II. Xylem parenchyma is involved in upward movement of water.
III. Tyloses occurs in xylem fibers.

A

I and II

B

Only I

C

II and III

D

Only III

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statements about xylem elements are true, let's analyze each statement step by step. ### Step 1: Analyze Statement I **Statement I:** "The gymnosperms lack xylem vessels; instead, they possess tracheids." - **Explanation:** Gymnosperms, such as conifers, primarily contain tracheids for water conduction and do not have xylem vessels. This statement is true. ### Step 2: Analyze Statement II **Statement II:** "Xylem parenchyma is involved in upward movement of water." - **Explanation:** Xylem parenchyma primarily serves as storage and does not play a significant role in the upward movement of water. The upward movement of water is mainly facilitated by xylem vessels. Therefore, this statement is false. ### Step 3: Analyze Statement III **Statement III:** "Tyloses occur in xylem fibers." - **Explanation:** Tyloses are outgrowths that occur in the xylem vessels, specifically in the secondary xylem, and not in xylem fibers. Thus, this statement is also false. ### Conclusion Based on the analysis: - **Statement I** is true. - **Statement II** is false. - **Statement III** is false. The only true statement is **Statement I**. ### Final Answer The correct answer is that only Statement I is true. ---
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