CBSE Class 4 EVS A Rivers Tale Worksheet Set 02

I. Given below are four cards. Write a line on each conveying message "Keep the River Water Clean".
Answer: Card 1: Do not throw garbage or plastic waste into rivers.
Card 2: Rivers are our lifeline, keep them pure and clean.
Card 3: Stop industrial waste from polluting our natural water bodies.
Card 4: Save river water to protect aquatic life and our future.
In simple words: Write short slogans on the cards to tell people not to dirty the rivers.
Exam Tip: Use catchy and clear slogans related to water conservation and pollution prevention.

II. Match the columns to make sensible sentences.
Answer: 1. Water can be polluted by -> rubbish thrown into rivers.
2. We get water from -> hand pumps.
3. A sea -> is a very large water body.
4. Potassium permanganate -> is a chemical used for cleaning water.
In simple words: Connect each item in Column A with its correct description in Column B.
Exam Tip: Read both columns completely before matching to avoid incorrect pairs.

Give three examples for each of the following.

Question 1. Animals that live in water
Answer: Fish, Whale, Octopus
In simple words: Name three animals found underwater.
Exam Tip: Aquatic animals include fish, mammals, and invertebrates living in fresh or salt water.

Question 2. Diseases caused by polluted water
Answer: Cholera, Typhoid, Jaundice
In simple words: Name three illnesses people get from drinking dirty water.
Exam Tip: Water-borne diseases spread easily when harmful germs contaminate drinking sources.

Question 3. Sources of water
Answer: Rain, River, Well
In simple words: Name three places from where we obtain water.
Exam Tip: Rain is the primary natural source of water on Earth.

Question 4. Water sports
Answer: Swimming, Boating, Rafting
In simple words: Name three sports played in or on water.
Exam Tip: Water sports require safety equipment like life jackets.

Fill in the blanks.

Question 1. Adding chemicals like __________ to water kills germs present in it.
Answer: chlorine
In simple words: Chlorine is added to water to destroy harmful bacteria.
Exam Tip: Chlorine is commonly used in water purification plants.

Question 2. Water must be boiled for at least __________ minutes to kill germs.
Answer: 10 to 15
In simple words: Boiling water for a few minutes makes it safe from germs.
Exam Tip: Boiling is the easiest and most effective household method to purify drinking water.

Question 3. __________ dump waste in rivers.
Answer: Factories and people
In simple words: Human activities and industries throw garbage into rivers.
Exam Tip: Dumping waste causes severe water pollution and harms aquatic life.

Question 4. Making water safe for drinking is called __________ of water.
Answer: purification
In simple words: Cleaning water so it is fit to drink is called purification.
Exam Tip: Purification removes impurities and harmful micro-organisms.

III. Given below are some ways of cleaning the drinking water. Circle those you use at home.
Answer: Students should circle the methods they use at home (such as boiling water, water filter, or electronic water purifier).
In simple words: Identify and mark the water cleaning methods present in your own house from the given pictures.
Exam Tip: Electronic water purifiers and boiling are common modern and traditional purification methods.

V. Write a letter to your local newspaper complaining about a factory that is polluting the canal near your school. Some points could be: the water smells bad, some buffalos died after they went into the canal, people who are touching the water are getting skin diseases.
Answer:
To
The Editor,
The Local Daily Newspaper,
City.

Subject: Complaint regarding factory pollution in the canal near school.

Respected Sir/Madam,
Through the columns of your esteemed newspaper, I want to draw the attention of the concerned authorities towards the severe pollution of the canal situated near our school. A nearby factory has been continuously releasing toxic waste into the water body.

The situation has become alarming. The water of the canal now emits a foul, unbearable smell. Recently, some buffaloes died after entering the polluted water. Furthermore, people and children living nearby who accidentally touch the water are suffering from skin diseases and rashes.

I earnestly request the municipal authorities to take strict action against the factory and clean the canal immediately to save human lives and animals.

Yours faithfully,
A Concerned Student
In simple words: Write a formal letter to a newspaper editor complaining about factory waste making the canal water dangerous and smelly.
Exam Tip: Follow the correct formal letter format including sender details, subject, body paragraphs, and sign-off.

Question. Write true or false
a. Water in the river was clean when it reached the village.
b. River water becomes more clean when people throw different things in it.
c. If the water looks clean, it is alright to drink.
Answer : a. True
b. False
c. False

Question. Match the following
a. Boil water i. harmful
b. Bathing Animals ii. salty
c. Dirty water iii. fresh water
d. Seawater iv. Dirty river
e. Water plants v. drinking
Answer :  a – v
b – iv
c – i
d – ii
e – iii

Question. Answer in one word
a. Can fish survive in dirty water?
b. Do all things dissolve in water?
Answer : a – No
b – No