CBSE Class 9 Science Worksheet
Unit 4-Our Environment - Natural Resources
1.
Which radiation in the Sunlight contributes to the hotness?
A)
Infrared
B)
Ultraviolet
C)
X-rays
D)
Gamma rays
2.
Which of the following absorbs carbon dioxide?
A)
Animals
B)
Plants
C)
Decomposers
D)
All of the above
3.
Why do we feel relief from the heat if we go near the lake during summer?
4.
Choose the correct answer: Acid rain occurs due to ________.
A)
CO2
B)
CO
C)
SO2
D)
CH4
5.
Which gas constitutes the maximum percentage in Earth's atmosphere?
A)
Oxygen
B)
Nitrogen
C)
Carbon Dioxide
D)
Hydrogen
6.
What are biotic and abiotic factors required in the formation of soil?
7.
Which of the following processes is not a step involved in the water cycle operating in nature?
A)
Evaporation
B)
Photosynthesis
C)
Transpiration
D)
Precipitation
8.
Choose the correct answer: Fuel formed under Earth's surface by decomposition of organic matter is called ___________.
A)
Organic fuel
B)
Fossil fuel
C)
Bio gas
D)
Underground fuel
9.
State TRUE/FALSE: Acid rain has very less effect in India because our soils are alkaline in nature.
A)
TRUE
B)
FALSE
10.
How is oxygen used up from the atmosphere and returns back to the atmosphere?
11.
Which of the following is the pollution indicator plant?
A)
Lichens
B)
Algae
C)
Fungi
D)
Ferns
12.
Which gas in the atmosphere can absorb Sun's harmful ultraviolet rays?
A)
Methane
B)
Ozone
C)
CFC
D)
Nitrogen Dioxide
13.
What happens to Nitrogen we inhale while breathing inside our body?
A)
It moves along with oxygen into the cells
B)
It comes out with the carbon dioxide during exhalation
C)
It is absorbed only by the nasal cells
D)
None of the these
14.
Fill in the blanks: ____________ bacteria in root nodules fixes nitrogen which increases the soil fertility.
15.
Fill in the blanks: _______ are called pioneer colonizers of bare rock.
16.
State TRUE/FALSE: Nitrosomonas converts ammonia into nitrates.
A)
TRUE
B)
FALSE
17.
Choose the correct answer: Global atmospheric temperature is likely to increase due to _________.
A)
Burning of fossil fuels.
B)
Water pollution
C)
Soil erosion
D)
None of the above
18.
What is the constituent of water in Earth?
A)
25%
B)
45%
C)
75%
D)
30%
19.
Choose the correct answer: In carbon cycle, flow of energy is ____________.
A)
Reversible
B)
Irreversible
C)
Cyclic
D)
Linear
20.
Which of the following is not a greenhouse gas?
A)
Methane
B)
Carbon Dioxide
C)
Nitrogen Dioxide
D)
None of the above
CBSE Class 9 Science Worksheet
Unit 4-Our Environment - Natural Resources
Answers
1.
Option A
2.
Option B
3.
Because air near water bodies is cooled due to evaporation of water.
4.
Option C
5.
Option B
6.
Biotic – Lichens, mosses and trees Abiotic – Sun, water, wind
7.
Option B
8.
Option B
9.
Option A
10.
It is consumed by the humans and plants for respiration, and vehicles, factories etc for combustion. It returns to the atmosphere by the process of photosynthesis.
11.
Option A
12.
Option B
13.
Option B
14.
Rhizobium
15.
Lichens
16.
Option A
17.
Option A
18.
Option C
19.
Option D
20.
Option D
