CBSE Class 3 EVS Revision Worksheet Set 13

CBSE Class 3 EVS Practice Worksheets (45)-Revision

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MBS International School
EVS Worksheet - Class III

Question Q-1-Tick the correct answer.
a)Kidneys are the organs in the
(i)Nervous System ( ) (ii)Excretory System ( )
(iii)Circulatory System ( ) (iv)Respiratory System( )

b)_____________ are the smallest unit of our body.
(i)Cells ( ) (ii)Tissues ( )
(iii)Organ ( ) (iv)Organ System ( )

c) The device which directs traffic light on the road is called _____________
(i)zebra crossing ( ) (ii)traffic light ( )
(iii)traffic policeman ( ) (iv)pavement ( )

d)______________ gas used in fizzy drinks.
(i)Oxygen ( ) (ii)Nitrogen ( )
(iii)Carbon dioxide ( ) (iv)Hydrogen ( )
Answer:
(a) (ii)Excretory System
(b) (i)Cells
(c) (ii)traffic light
(d) (iii)Carbon dioxide
In simple words: Kidneys filter waste, cells build our body, traffic lights guide road cars, and carbon dioxide makes soda fizzy.

Exam Tip: Tick the correct box neatly and write the matching option in the blank space.

Question Q-2:-Fill in the blanks.
a) Plants takes in ____________ and gives out ____________.
b) _______________ absorb nutrients from the body.
c) ________________ discovered cells.
d) A traffic policeman directs __________ on the roads.
e) ______________ is a life giving gas.
f) Always wear ___________ when going in a car.
g) Air has ___________ which supports burning.
Answer:
(a) Plants takes in carbon dioxide and gives out oxygen.
(b) Blood vessels absorb nutrients from the body.
(c) Robert Hooke discovered cells.
(d) A traffic policeman directs traffic on the roads.
(e) Oxygen is a life giving gas.
(f) Always wear seat belt when going in a car.
(g) Air has oxygen which supports burning.
In simple words: Plants breathe carbon dioxide and give us oxygen. Blood moves food, Robert Hooke found cells, police direct cars, seat belts keep us safe, and oxygen burns things.

Exam Tip: Learn spelling for key science words like 'stomata', 'oxygen', and 'carbon dioxide'.

Question Q-3:-State true or false for the following statements.
a) Nitrogen forms around 78% of the total air. ( )
b) Always walk on the pavement and not on the road. ( )
c) Many cells form an organ system. ( )
d) Air cannot be seen so it does not have weight. ( )
e) Lungs are important organs in the respiratory system. ( )
Answer:
(a) True
(b) True
(c) False (Correction: Many organs form an organ system.)
(d) False (Correction: Air has weight even though we cannot see it.)
(e) True
In simple words: Air has weight and lots of nitrogen. Lungs help us breathe, pavements keep us safe, and organs make systems.

Exam Tip: For false statements, always write down the correct fact in your notebook to study later.

Question Q-4:-Match the columns:-
Answer:
We can match the two columns as follows:

In simple words: The large intestine gets rid of waste, traffic lights guide cars, plants use carbon dioxide for food, nitrogen is 78% of air, and air is a mix of gases.

Exam Tip: Draw straight lines or write the matching letters clearly on the sheet.

Question Q-5:-Answer the following questions in one word.
a)Name the organ which pumps blood to different parts of the body.________________
b)Red signal of traffic light means ________________
c)Which gas is used in fire extinguishers? ___________________
d)Which organ system protects our delicate internal organs? ______________
Answer:
(a) Heart
(b) Stop
(c) Carbon dioxide
(d) Skeletal system
In simple words: The heart pumps blood, red means stop, carbon dioxide puts out fire, and bones protect our inside parts.

Exam Tip: Keep your answers to exactly one word as requested by the question.

Question Q-6:- Complete the web chart with uses of air.
Answer:
Four important uses of air are:
1. Air is needed for breathing.
2. Air is needed for burning fires.
3. Air is used to fill balloons and tires.
4. Air helps birds and kites fly.
In simple words: We need air to breathe, to burn fires, to fill balloons, and to help birds fly.

Exam Tip: Draw a neat circle and write one simple use of air in each box of the web chart.

Question Q-7:-Give the answer of the following questions.
a) Write the properties of air.
b) What is the use of road signs?
c) Write the use of wind vane.
Answer:
(a) Air has these properties:
1. Air occupies space.
2. Air has weight.
3. Air exerts pressure.
(b) Road signs help guide drivers and walkers on the road. They keep us safe from accidents.
(c) A wind vane is used to show the direction of the wind (which way the wind is blowing).
In simple words: Air takes up space and has weight. Road signs keep us safe, and a wind vane shows wind direction.

Exam Tip: Write your answers in short, numbered points to make them easy to read.

Question Q-8:-Draw a chart to show different components in air .Write the names of gases and their amount in percentage.
Answer:
The main components of air are:
* Nitrogen: 78%
* Oxygen: 21%
* Other gases (Carbon dioxide, water vapour, argon): 1%
In simple words: Air is mostly made of nitrogen gas, with some oxygen and a tiny bit of other gases.

Exam Tip: You can draw a simple pie chart (circle) showing a large slice for Nitrogen and a smaller slice for Oxygen.

Question Q-9:-Draw any two road signs and write their meaning also.
Answer:
We can draw these two common road signs:
1. A Red Octagon with "STOP" written on it: This sign tells drivers to stop their vehicles completely.
2. A horn with a red diagonal line across it: This is a "No Horn" sign. It means drivers must not honk near hospitals or schools.
In simple words: The stop sign tells cars to stop. The no horn sign tells drivers to be quiet near schools.

Exam Tip: Draw the shapes of the signs neatly with a pencil and color them correctly.