With reference to the role of plants in the water cycle, consider the following statements: 1. Plants absorb water from the soil and retain all of it for food preparation. 2. Wheat plants can release a significant quantity of water into the air relative to their yield. 3. Forests and grasslands contribute to the formation of water vapour in the atmosphere. Which of the statements given above is/are correct?

The correct option is (c). Explanation The process of transpiration, a vital component of the hydrological cycle where plants release water vapour into the atmosphere through stomata present on their leaves. Statement-wise Analysis: - Statement 1 is Incorrect. While plants absorb a significant amount of water from the soil through their roots, they do not retain all of it. Only a very small fraction (often less than 5%) is utilized for photosynthesis and growth. The vast majority of the absorbed water is released back into the air as water vapour through the process of transpiration. - Statement 2 is Correct. Plants release a large quantity of water relative to the biomass or yield they produce. For instance, scientific data indicates that to produce 1 kilogram of wheat, wheat plants release approximately 500 litres of water into the atmosphere. This demonstrates the significant volume of water cycled by crops. - Statement 3 is Correct. Large-scale vegetation covers, such as forests and grasslands, play a critical role in the water cycle. Through evapotranspiration, they release massive amounts of water vapour into the atmosphere. This moisture contributes to humidity, cloud formation, and subsequent precipitation. Key Takeaway: Transpiration is the process by which plants release excess water as vapour into the atmosphere, significantly contributing to the global water cycle and local climate regulation.

With reference to the role of plants in the… - NCERT Class 6 Environment & Ecology MCQ

NCERT Class 6 Environment & Ecology — Chapter 1: Water

mcqmedium

With reference to the role of plants in the water cycle, consider the following statements:

Plants absorb water from the soil and retain all of it for food preparation.
Wheat plants can release a significant quantity of water into the air relative to their yield.
Forests and grasslands contribute to the formation of water vapour in the atmosphere.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 6 · Page 139

Options

A1 and 2 only
B2 only
C2 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (c).

Explanation

The process of transpiration, a vital component of the hydrological cycle where plants release water vapour into the atmosphere through stomata present on their leaves.

Statement-wise Analysis:

Statement 1 is Incorrect. While plants absorb a significant amount of water from the soil through their roots, they do not retain all of it. Only a very small fraction (often less than 5%) is utilized for photosynthesis and growth. The vast majority of the absorbed water is released back into the air as water vapour through the process of transpiration.
Statement 2 is Correct. Plants release a large quantity of water relative to the biomass or yield they produce. For instance, scientific data indicates that to produce 1 kilogram of wheat, wheat plants release approximately 500 litres of water into the atmosphere. This demonstrates the significant volume of water cycled by crops.
Statement 3 is Correct. Large-scale vegetation covers, such as forests and grasslands, play a critical role in the water cycle. Through evapotranspiration, they release massive amounts of water vapour into the atmosphere. This moisture contributes to humidity, cloud formation, and subsequent precipitation.

Key Takeaway:
Transpiration is the process by which plants release excess water as vapour into the atmosphere, significantly contributing to the global water cycle and local climate regulation.

Your note

More from Chapter 1: Water

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How does rapid industrialization primarily affect freshwater availability?

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With reference to heavy rains and floods, consider the following statements: 1. Heavy rains can lead to a rise in the water level of rivers and lakes. 2. Floods are generally beneficial for the survival of soil-dwelling animals. 3. Animals living in water can get carried away to land areas during floods and die when water recedes. Which of the statements given above is/are correct?

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Which of the following factors contribute to the decreasing availability of usable water? 1. Rising population. 2. Industries consume a negligible amount of water compared to domestic use. 3. Food production requires no water resources. Select the correct answer using the code given below:

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