Which of the following factors negatively affects the seepage of rainwater into the ground? 1. Presence of vegetation. 2. Concrete roads and buildings. 3. Compacted soil with low permeability. Select the correct answer using the code given below:

Correct Option The correct option is (c) 2 and 3 only. Explanation Seepage (or infiltration) is the process by which water on the ground surface enters the soil. It is critical for groundwater recharge. The rate of seepage is determined by the permeability of the surface material and the duration water remains on the surface. Statement-wise Analysis - Statement 1 is Incorrect: The presence of vegetation positively affects seepage. Plant roots loosen the soil, increasing porosity and creating channels for water to move downwards. Furthermore, vegetation slows the velocity of surface runoff, allowing more time for water to infiltrate the ground. - Statement 2 is Correct: Concrete roads and buildings constitute impervious surfaces. These artificial structures seal the ground, preventing water from penetrating the soil. This blockage drastically reduces seepage and increases surface runoff. - Statement 3 is Correct: Compacted soil is characterized by pressed soil particles with minimal pore space. This results in low permeability, which physically restricts the downward movement of water, thereby negatively affecting seepage. Key Takeaway Factors that increase surface impermeability (such as urbanization and concrete) or reduce soil porosity (such as compaction) hinder rainwater seepage, whereas vegetation promotes it.

Which of the following factors negatively… - NCERT Class 6 Environment & Ecology MCQ

NCERT Class 6 Environment & Ecology — Chapter 1: Water

mcqmedium

Which of the following factors negatively affects the seepage of rainwater into the ground?

Presence of vegetation.
Concrete roads and buildings.
Compacted soil with low permeability.

Select the correct answer using the code given below:

NCERT textbook question

From NCERT Science - class 6 · Page 141

Options

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

Did you get this right?

Solution

Correct Option

The correct option is (c) 2 and 3 only.

Explanation

Seepage (or infiltration) is the process by which water on the ground surface enters the soil. It is critical for groundwater recharge. The rate of seepage is determined by the permeability of the surface material and the duration water remains on the surface.

Statement-wise Analysis

Statement 1 is Incorrect: The presence of vegetation positively affects seepage. Plant roots loosen the soil, increasing porosity and creating channels for water to move downwards. Furthermore, vegetation slows the velocity of surface runoff, allowing more time for water to infiltrate the ground.
Statement 2 is Correct: Concrete roads and buildings constitute impervious surfaces. These artificial structures seal the ground, preventing water from penetrating the soil. This blockage drastically reduces seepage and increases surface runoff.
Statement 3 is Correct: Compacted soil is characterized by pressed soil particles with minimal pore space. This results in low permeability, which physically restricts the downward movement of water, thereby negatively affecting seepage.

Key Takeaway

Factors that increase surface impermeability (such as urbanization and concrete) or reduce soil porosity (such as compaction) hinder rainwater seepage, whereas vegetation promotes it.

Your note

More from Chapter 1: Water

What happens to the water that falls on land as rain and snow? 1. Most of it ultimately flows back to the oceans. 2. None of the rainwater seeps into the ground. 3. It remains permanently on the land surface to form lakes. Select the correct answer using the code given below:

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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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What causes the formation of water droplets on the outer surface of a container filled with ice-cold water?

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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:

easy

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