Lesson 6 - Effects of Human Activities on Environment

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My Science, Health and Physical Education Guide

Part 1 - Science

Lesson 6 - Effects of Human Activities on Environment


1 Put a tick (√) if the statements are correct and a cross (×) if they are wrong.

Answer 👉 

a. Polluted air is injurious to health. (√)

b. Humans have no role in air pollution. (×)

c. Drainage channels should not be mixed in river and ponds. (√)

d. Population growth is the main reason of deforestation. (×)

e. Terrace farming does not cause erosion. (×)




2. Fill in the blanks with correct words.

Answer 👉 

a. We should not use water purifying tablets more than required.
b. Air gets polluted from exhaust fumes and emissions of the moving vehicle.
c. Water gets contaminated from the mixing of water with chemicals from factories into the rivers.
d. We should only carry out terrace farming on the sloppy land.



3. Answer the following questions in short.
a. What activities of humans cause air pollution?
Answer 👉 Activities of humans that cause air pollution include burning of fossil fuels, industrial activities, transportation, and deforestation.

b. Mention the causes of water pollution.
Answer 👉 Causes of water pollution include discharge of untreated sewage and industrial waste into water bodies, use of pesticides and fertilizers in agriculture, oil spills, and littering.

c. What are the main causes of deforestation?
Answer 👉  The main causes of deforestation include clearing of forests for agriculture, logging, and urbanization.

d. Define erosion. What activities of humans cause erosion?
Answer 👉 Erosion is the process of wearing away of soil or rock by the action of wind, water or other external factors. Activities of humans that cause erosion include deforestation, overgrazing, and improper land use practices.

e. List the effects of polluted water and polluted air on humans.
Answer 👉 Effects of polluted water on humans include waterborne diseases, such as cholera, diarrhea, and typhoid, and long-term health problems, such as cancer and neurological disorders. Effects of polluted air on humans include respiratory problems, such as asthma and bronchitis....



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