Question 61 of 782
One of the function of xylem is
- A. strengthening the stem
- B. manufacturing food
- C. reducing loss of water
- D. conducting manufactured food
Correct Answer:
A
Explanation
The correct option is
A. strengthening the stem.
Detailed Explanation:
- Understanding Xylem:
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Xylem is one of the two types of vascular tissue in plants, the other being phloem. The primary function of xylem is to transport water and dissolved minerals from the roots to the rest of the plant. However, xylem also plays a crucial role in providing structural support to the plant.
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Function of Xylem in Strengthening the Stem:
- The xylem tissue is composed of various cell types, including tracheids and vessel elements, which are specialized for water conduction. These cells have thick, lignified walls that provide rigidity and strength. This structural support is essential for the plant to maintain its upright position and withstand various environmental stresses, such as wind and gravity.
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As the plant grows, the xylem cells contribute to the overall strength of the stem, allowing it to support leaves, flowers, and fruits. This is particularly important in tall plants and trees, where the xylem must support significant weight.
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Why Other Options Are Incorrect:
- B. Manufacturing food: This function is primarily associated with chloroplasts in the leaves, where photosynthesis occurs. The xylem does not play a role in food production; instead, it is involved in transporting water and nutrients necessary for photosynthesis.
- C. Reducing loss of water: While xylem does help in transporting water, it does not directly reduce water loss. The function of reducing water loss is primarily associated with structures like stomata and the cuticle on leaves, which help minimize transpiration (the loss of water vapor).
- D. Conducting manufactured food: This function is primarily the role of phloem, which transports the sugars and nutrients produced during photosynthesis from the leaves to other parts of the plant. Xylem is not involved in this process.
Summary of Key Points:
- Xylem is crucial for transporting water and minerals but also provides structural support to the plant.
- The thick, lignified walls of xylem cells contribute to the strength of the stem.
- Other options (B, C, D) refer to functions of different plant structures (chloroplasts for food manufacturing, stomata for water loss reduction, and phloem for food transport).
Revision Summary:
- Xylem's primary role is to transport water and minerals.
- It also strengthens the plant stem through its lignified cell walls.
- Xylem is not involved in food manufacturing or reducing water loss.
- Phloem is responsible for conducting manufactured food in the plant.