Given below are two statements:
Statement I: The forces generated transpiration can lift a xylem-sized column of water over 130 meters height.
Statement II: Transpiration cools leaf surfaces sometimes 10 to 15 degree evaporative cooling.
In the light of the above statements, choose the most appropriate answer from the options given below:
Given below are two statements:
Statement I: The forces generated transpiration can lift a xylem-sized column of water over 130 meters height.
Statement II: Transpiration cools leaf surfaces sometimes 10 to 15 degree evaporative cooling.
In the light of the above statements, choose the most appropriate answer from the options given below:
Both Statement I and Statement II are incorrect
Statement I is correct but Statement II is incorrect
Statement I is incorrect but Statement II is correct
Both Statement I and Statement II are correct
The Correct Option is D
Solution and Explanation
Statement I is correct: Transpiration creates a negative pressure or tension in the xylem, which generates forces that can lift a column of water up to considerable heights. This phenomenon is known as the cohesion-tension theory and is an important mechanism for water transport in plants.
Statement II is correct: Transpiration does indeed cool leaf surfaces through evaporative cooling. As water is lost through stomata during transpiration, it takes heat energy with it, thus cooling the leaf surface. This cooling effect can range from 10 to 15 degrees Celsius or even more, depending on environmental conditions.
Therefore, The correct option is (D): Both Statement I and Statement II are correct
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Concepts Used:
Transport in Plants
The two types of conducting tissues that are used to transport the water and minerals in plants such as:
Xylem:
Xylem is a long, non-living tube running from the roots to the leaves via the stem. The water is absorbed by the root hair and goes through cell-to-cell movement by osmosis until it reaches the xylem. This water is then transported throughout the xylem vessels to the leaves and is evaporated by the process of transpiration.
The xylem is also composed of lengthened cells like the phloem. However, the xylem is mainly accountable for transporting water to all plant parts from the roots. Since they serve such a vital function, a single tree would have a lot of xylem tissues.
Phloem:
The phloem is accountable for the translocation of nutrients and sugar like carbohydrates, produced by the leaves to areas of the plant that are metabolically in force. It is powered by living cells. The cell walls of these cells structurize small holes at the ends of the cells known as sieve plates.
Means of Transportation in Plants:
Transportation in plants is by 3 means, they are as follows:
- Diffusion
- Facilitated diffusion
- Active Transport