CBSE Class 7 Marking Scheme 2022 Science Term 2 Set 2

TERM II SAMPLE PAPER - 2
MARKING SCHEME
SUBJECT – SCIENCE
CLASS - VII
SECTION A OBSERVTION AND REPORTING
1. The water-bearing layer of the earth is
Aquifer.
2.symbols to represent cell and battery

3.CAPILLARIES

4.Distance travelled per unit time.
5.FERTILIZATION
6.MCB
7.CONVEX
8. HERBS

9. REFLECTION
10.Because of the release of oils and fats in drains it hardens the soil in sewage pipes and
blocks them.

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SECTION B IDENTIFICATION
Q11. Identify and label the plant reproductive parts:-(2)

12. Identify the mirror in the picture and write its 2 uses.

Uses Of Concave Mirror
• Shaving mirrors.
• Head mirrors.
• Ophthalmoscope.
• Astronomical telescopes.
• Headlights.
• Solar furnaces.

Q 13 Observe the picture and write why the picture 1 is marked as wrong and picture 2 as
right?

Pictures 1 is marked worng because garbage is thrown into sink directly.

Picture 2 is marked right because garbage is thrown into dustbin properly.

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14. Identify the reason and explain in brief the following: (4)
1.Growing shortage of water
Increase in demand, decrease in supply,Depleting natural resources .
2.Sanitation and diseases are related
Good sanitation and waste management help to keep people separate from potential
sources of pathogens. They reduce the risk of contaminating water supplies with
pathogens and discourage the transmission of disease.

SECTION C DISCOVERY OF FACTS
Q15. Draw the diagram of human excretory system and label its various parts. (3)

16. a.When a current is switched on through a wire, the wire starts behaving as a magnet.
Hence, when a compass needle is placed near the given current carrying wire, it gets
influenced bythe magnetic effect of electric current and gets deflected from its North-South
position.
b. Draw the circuit diagram to represent this electric circuit.

17. soil pollution can be prevented. (Any three points) (3)
Prevention of soil pollution can be done by (i) use of manures instead of synthetic fertilisers.
(ii) use of natural pesticides. (iii) avoid dumping of polythene and plastics in soil. (iv) industrial
waste should be treated before release in soil.

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18. (a)difference between sexual and asexual reproduction? (4)

B .Methods of asexual reproduction?
There are a number of types of asexual reproduction including fission, fragmentation,
budding, vegetative reproduction, spore formation

SECTION D
APPLICATION
Q19. Show the shape of the distance-time graph for the motion in the following cases:
(i) A car moving with a constant speed.
(ii) A car parked on a side road.

Q20. Flood is a natural calamity. List some methods to prevent outbreak of flood.
Some of the common techniques used for flood control are planting trees , preventing soil
erosion and over mining , the installation of rock beams, rock rip-raps, sand bags,
maintenanceof normal slopes with vegetation or application of soil cements on steeper
slopes and construction or expansion of drainage. (2)

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Q21. What is your role as an active citizen in relation to sanitization in our surroundings?
A citizen has many responsibilities regarding sanitation. Among other things, an active citizen
should do the following with regard to maintaining proper sanitation: 1) Ensure that his
surroundings (both inside and outside home) are clean. 2) Ensure that the sewerage system
in his house is properly managed.
Q 22. (a)When does water table get depleted? (2)
Water drawn from under the ground gets replenished by seepage of rainwater. The water table
does not get affected as long as we drawn as much water as is replenished by natural process.
However, water table may go down if the water is not replenished sufficiently this may
happens due to many reasons increase in population industrial and agricultural activities are
some common factors which cause depletion in water table.
(b) List any four reasons for depletion of water table.
Various causes of the depletion of water table are:-
1 Increase in population
2 Industrialization
3 Agricultural activities
4 Scanty rainfalls
5 Deforestation

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