What is the likely consequence if it does not rain in a region for a year or more? 1. The rate of evaporation from the soil becomes zero immediately after the rains stop. 2. The groundwater level typically depletes due to lack of replenishment. 3. Ponds and wells may dry up. Select the correct answer using the code given below:

The correct option is (c). Explanation The impact of prolonged absence of rainfall, often leading to drought conditions. This involves the interaction between abiotic factors (rainfall, temperature, soil) and the hydrological cycle within an ecosystem. Statement-wise Analysis: - Statement 1 is Incorrect. Evaporation is a continuous process driven by temperature, wind speed, and humidity. When rains stop, the soil still retains moisture. Evaporation continues from the soil surface until the moisture is significantly depleted. The rate does not become zero immediately; rather, the soil gradually loses water, eventually becoming dry and hard. - Statement 2 is Correct. Groundwater is primarily replenished (recharged) through the infiltration of rainwater into the soil. If it does not rain for a year or more, this recharge process is halted. Meanwhile, natural outflow and human extraction continue, causing the water table to lower or deplete. - Statement 3 is Correct. Surface water bodies like ponds lose water through evaporation and seepage. Without rainfall to replenish them, the water level drops, potentially leading them to dry up completely. Similarly, as the groundwater table recedes, wells that tap into shallow aquifers may also go dry. Key Takeaway: A prolonged lack of rainfall disrupts the water cycle, leading to the drying of soil (drought), depletion of groundwater levels due to lack of recharge, and the drying up of surface water bodies.

What is the likely consequence… - NCERT Class 6 Environment & Ecology MCQ

NCERT Class 6 Environment & Ecology — Chapter 1: Water

mcqmedium

What is the likely consequence if it does not rain in a region for a year or more?

The rate of evaporation from the soil becomes zero immediately after the rains stop.
The groundwater level typically depletes due to lack of replenishment.
Ponds and wells may dry up.

Select the correct answer using the code given below:

NCERT textbook question

From NCERT Science - class 6 · Page 143

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 impact of prolonged absence of rainfall, often leading to drought conditions. This involves the interaction between abiotic factors (rainfall, temperature, soil) and the hydrological cycle within an ecosystem.

Statement-wise Analysis:

Statement 1 is Incorrect. Evaporation is a continuous process driven by temperature, wind speed, and humidity. When rains stop, the soil still retains moisture. Evaporation continues from the soil surface until the moisture is significantly depleted. The rate does not become zero immediately; rather, the soil gradually loses water, eventually becoming dry and hard.
Statement 2 is Correct. Groundwater is primarily replenished (recharged) through the infiltration of rainwater into the soil. If it does not rain for a year or more, this recharge process is halted. Meanwhile, natural outflow and human extraction continue, causing the water table to lower or deplete.
Statement 3 is Correct. Surface water bodies like ponds lose water through evaporation and seepage. Without rainfall to replenish them, the water level drops, potentially leading them to dry up completely. Similarly, as the groundwater table recedes, wells that tap into shallow aquifers may also go dry.

Key Takeaway:

A prolonged lack of rainfall disrupts the water cycle, leading to the drying of soil (drought), depletion of groundwater levels due to lack of recharge, and the drying up of surface water bodies.

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:

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