case /data -based (4 Marks)

Question 14 Marks

The graph shows the Air Quality Index $(AQI)$ of four different cities.

$8.$ Which city’s air is the most polluted? Explain your answer.
$9.$ The air of only City $1$ and City $3$ are safe for breathing.
What is the AQI limit for safe breathing$?$
$A.$ Less than $50$
$B.$ In between $50$ and $100$
$C.$ In between $100$ and $150$
$D.$ In between $150$ and $200$
$10.$ Which of these steps can help reduce air pollution?
Circle ‘Yes’ or ‘No’ for the correct response.

Can this reduce air pollution?	Yes or No
Planting a large number of trees	Yes/No
Using biofuel as an energy source	Yes/No
Burning of agricultural wastes	Yes/No

Answer

$8.$ Mentions City $4$ as the response because it has the highest $AQI$ index.
$9. C.$ In between $100$ and $150$
$10.$ Yes
Yes
No

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Question 24 Marks

The table shows the properties of four water samples.

Water Sample	Smell	Colour
Sample $1$	No smell	Slightly muddy
Sample $2$	Strong bad smell	Muddy and greenish
Sample $3$	Very light smell	Colourless
Sample $4$	No smell	Colourless

$6$. Which water sample is likely to be least polluted$?$
$A.$ Sample $1$
$B.$ Sample $2$
$C$. Sample $ 3$
$D$. Sample $4$
$7.$ In which water source will the survival of aquatic animals be the most dificult$?$
$A.$ Source of Sample $1$
$B.$ Source of Sample $2$
$C.$ Source of Sample $3$
$D.$ Source of Sample $4$

Answer

$6. D.$ Sample $4$
$7. B.$ Source of Sample $2$

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Question 34 Marks

Rakesh pours some polluted water on a ilter paper.
He collects the iltered water in a conical flask.

$4.$ Is the iltered water suitable for drinking$?$ Explain your answer.
$5.$ Which of these is true about greenhouse gases$?$
Circle ‘Yes’ or ‘No’ for the correct response.

Is this true about greenhouse gases$?$	Yes or No
Deforestation leads to an increase in greenhouse gases in the air.	Yes/No
Nitrogen dioxide $(NO_2)$ is a greenhouse gas.	Yes/No
Excess of greenhouse gases in the air causes global warming.	Yes/No

Answer

$4.$ Mentions that the iltered water is unsafe for drinking as it may contain harmful microorganisms.
For example:
● No. It may contain harmful microorganisms.
$5.$ Yes
No
Yes

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Question 44 Marks

Seema ills four similar ish tanks with freshwater from different sources.
She puts six freshwater ish in each tank.
The table shows her indings after two days.

Tank	Findings
Tank $1$	All fish are dead.
Tank $2$	$1$ fish is dead, and $5$ fish are alive
Tank $3$	All fish are alive.
Tank $4$	$2$ fish are dead, and $4$ fish are alive

$1.$ Which tank is likely to have been illed with the most polluted water$?$
$A.$ Tank $1$
$B.$ Tank $2$
$C.$ Tank $3$
$D.$ Tank $4$
$2.$ Seema repeats the activity by putting only one ish in each tank.
Can she rely on the results this time$?$ Explain your answer.
$3.$ Which of these activities causes water pollution?
$A.$ Rowing on a river
$B.$ Swimming on a river
$C.$ Fishing in a river with nets
$D.$ Dumping of sewage in river

Answer

$1. A.$ Tank $1$
$2.$ Mentions that the results will be unreliable as a single ish can die due to many unknown reasons.
For example,
● No. A single fish can die due to many unknown reasons.
$3. D.$ Dumping of sewage in river

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Science case /data -based (4 Marks)

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