With reference to "Water Pollution", consider the following statements: 1. It is caused by the discharge of untreated sewage. 2. It prevents the spread of diseases like cholera. 3. It affects only surface water and not groundwater. Which of the statements given above is/are correct?

The correct option is (a). Explanation Water pollution refers to the contamination of water bodies, such as lakes, rivers, oceans, aquifers, and groundwater, usually resulting from human activities. It occurs when pollutants are introduced into these water bodies without adequate treatment to remove harmful compounds. Statement-wise Analysis - Statement 1 is Correct: The discharge of untreated or partially treated sewage into water bodies is a primary cause of water pollution. Sewage contains organic matter, pathogens, and nutrients that degrade water quality and deplete dissolved oxygen. - Statement 2 is Incorrect: Water pollution does not prevent diseases; rather, it is a major cause of the spread of waterborne diseases. Contaminated water acts as a vector for pathogens causing diseases such as cholera, typhoid, dysentery, and hepatitis. - Statement 3 is Incorrect: Water pollution affects both surface water and groundwater. Pollutants from surface sources, such as agricultural runoff (containing nitrates and pesticides) and industrial waste, can leach through the soil and contaminate underground aquifers. Key Takeaway Water pollution encompasses the contamination of both surface water and groundwater sources. It is driven by factors like sewage discharge and agricultural runoff, serving as a primary transmission route for waterborne diseases rather than preventing them.

With reference to "Water… - NCERT Class 7 Environment & Ecology MCQ

NCERT Class 7 Environment & Ecology — Chapter 2: Wastewater story

mcqeasy

With reference to "Water Pollution", consider the following statements:

It is caused by the discharge of untreated sewage.
It prevents the spread of diseases like cholera.
It affects only surface water and not groundwater.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 7 · Page 163

Options

A1 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (a).

Explanation

Water pollution refers to the contamination of water bodies, such as lakes, rivers, oceans, aquifers, and groundwater, usually resulting from human activities. It occurs when pollutants are introduced into these water bodies without adequate treatment to remove harmful compounds.

Statement-wise Analysis

Statement 1 is Correct: The discharge of untreated or partially treated sewage into water bodies is a primary cause of water pollution. Sewage contains organic matter, pathogens, and nutrients that degrade water quality and deplete dissolved oxygen.
Statement 2 is Incorrect: Water pollution does not prevent diseases; rather, it is a major cause of the spread of waterborne diseases. Contaminated water acts as a vector for pathogens causing diseases such as cholera, typhoid, dysentery, and hepatitis.
Statement 3 is Incorrect: Water pollution affects both surface water and groundwater. Pollutants from surface sources, such as agricultural runoff (containing nitrates and pesticides) and industrial waste, can leach through the soil and contaminate underground aquifers.

Key Takeaway

Water pollution encompasses the contamination of both surface water and groundwater sources. It is driven by factors like sewage discharge and agricultural runoff, serving as a primary transmission route for waterborne diseases rather than preventing them.

Your note

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