Class 5 General Science (G.Sc.) Notes: Unit-4: Environmental Pollution : Solved Exercise ( MCQs, Questions and Answers)

General Science (G.Sc.) Class 5 Notes

Based on the Single National Curriculum, PK

(New Book/New Syllabus for 2023-2024 Exams and onward)

National Book Foundation
as
Federal Textbook Boards, Islamabad

************************************

A YouTube Video Presentation -- Please subscribe also!

********************************************************

"1. Tick ( ✓ ) the Correct Answers"

i. Which disease is caused due to air pollution? :

(a) diarrhea
(b) typhoid
(c) lungs cancer
(d) cholera

... Answer is (c)  lungs cancer
-----

ii. The germs present in it cause typhoid.

(a) sewerage water
(b) fertilizers
(c) factory waste
(d) insecticides

... Answer is (a)  sewerage water
-----

iii. Which one of these is non-biodegradable

(a) feather
(b) paper
(c) leaves of plant
(d) polythene bag

... Answer is (d) polythene bag
-----

v. Which one act causes most the air pollution?

(a) collecting of rubber
(b) burning of rubber
(c) reusing of rubber
(d) recycling of rubber

... Answer is (b) burning rubber
-----

************************************

👉Unit-4 YouTube Video Presentation -- Please subscribe also!👈

************************************

2. "Write Short Answers"

Q(i). Write three causes of air pollution? 

Ans: 

Causes of air pollution are:

1. Smoke from traffic and factories 

2. Burning of fossil fuels (coal, oil, gas) 

3. Use of aerosol Sprays 

Q(ii). What are the four effects of pollution?

Ans: 

The four effects of pollution are:

1. Germs present in polluted water cause different diseases. 

2 Some of the air pollutants such as CFCs damage the ozone layer.

3. Pollutant gases present in smog cause lung diseases and allergies.

4. Human and animal lives are at risk due to drinking polluted water.

Q(iii). What is the greenhouse effect?

Ans:

Green House Effect:

Carbon dioxide. and other gases present in the environment work like the glass of a greenhouse. These gases allow the sunlight to reach the Earth but do not allow the heat to leave the Earth. This process is called the greenhouse effect. Due to this our earth remains hot.

Q(iv). What will be the effects of Global Warming? 

Ans: Effects of Global Warming 

1. The climate of the world is changing due to global warming 

2. It is causing more rain and flooding. 

3. The North and South poles' ice is melting faster. Due to it, the level of seawater is rising. 

Q(v). Write three ways of preventive measures to reduce o pollution? 

Ans: 

1. Cutting of trees and forests should be reduced.

2. We should shift the factories away from the cities.

3. Polluted water should not be poured into rivers, canals, and lakes. 

4. The garbage and solid wastes in the house are to be disposed of properly. 

3. "Constructed Response Question"

Q(i). What is the main cause of pollution? 

Ans: 

Causes of Pollution:

1. The main cause of air pollution is the poisonous substances in the smoke emitted by vehicles on the roads and factories.

2. The polluted sewerage water, waste substances, insecticides, fertilizers, and leaking oil are the main causes of water pollution. 

3. Garbage from homes, fertilizers, wastes, and a spray of chemical substances are the main causes of land pollution.

Q(ii). Why Government of Pakistan has banned the use of polythene bags?

Ans. The government has banned polythene bags due to the following reasons. 

1. Polythene bags pollute not only water but also land.

2. Plastic bags are not degradable. 

3. These bags are not easy to recycle. 

4. They are harmful to human health. 

5. These are harmful to wildlife and marine life.

6. Polythene bags are filled with toxic and harmful chemicals. 

Q(iii). If it is written d2w on the polythene bags then why is there no ban on the use of such bags?

Ans. 

D2W is a chemical that is added to plastic to make it biodegradable and good for the environment.

"INVESTIGATE"

Q(i). What is the relationship between diseases and pollution?

Ans:

Environmental pollutants can affect everyone's health. Germs present in polluted water cause different diseases. Human and animal lives are at risk due to environmental pollutants. It can cause health problems like respiratory diseases, heart disease, and some types of cancer. Pollutant gases present in smog cause lung diseases and allergies.

Q(ii). Identify biodegradable and non-biodegradable materials present in your environment.

Ans:

Biodegradable Materials:

Materials that are broken down into simple Substances by the natural process are called biodegradable materials.

Examples: vegetables, fruits, meat, paper

Non- Biodegradable Materials: 

Materials that are not broken into simple substances by the natural process are called Non-biodegradable Materials. 

Examples: polythene bags, plastic bottles, and computer components. 

************************************

Shortcut Links For:

1.  5th Class: English Notes

2.  5th Class: Social Study (S.St.) Notes

3.  5th Class: General Science (G.Sc.) Notes

4.  5th Class: Urdu (اُردو) Notes

5.  5th Class: Islamiyat (اسلامیات) Notes

6.  5th Class: Mathematics Notes

7.  Easy English Grammar Notes

1. Website for School and College Level Physics   

(https://askrarequiz.blogspot.com)

2. Website for School and College Level Mathematics  

(https://askraremaths.blogspot.com)

3. Website for Single National Curriculum Pakistan - All Subjects Notes 

(https://askrareclassnotes.blogspot.com/)

© 2022 & onwards Academic Skills and Knowledge (ASK)   

Note:  Write to me in the comments box below for any query and also Share this information with your class-fellows and friends.