CBSE Class 10 Science Worksheet
Unit V: Natural Resources - Our Environment
1.
Which of the following constitute a food-chain?
A)
Grass, wheat and mango
B)
Grass, goat and human
C)
Grass, fish and goat
D)
None of these
2.
Choose the correct answer: Methods of safe disposal of non – biodegradable waste is/are_____________.
A)
Landfills
B)
Recycling
C)
Both 1 and 2
D)
None of these
3.
Choose the correct answer: How much percentage of a forest is good for ecological balance?
A)
45%
B)
33%
C)
25%
D)
50%
4.
Choose the correct answer: Among the following items (i) wood (ii) paper (iii) Bakelite (iv) PVC non – biodegradable wastes is/are
A)
Only (iii)
B)
(i) and (iii)
C)
(ii) and (iv)
D)
(iii) and (iv)
5.
Why is the flow of energy in a food chain unidirectional?
6.
Which of the following pose threat to the environment?
A)
Bacteria
B)
Consumers
C)
Aerosol
D)
aAll of these
7.
Fill in the blanks: Pesticides enter food chain at _______________ level.
8.
Write a food chain which is most likely to be part of a forest ecosystem.
9.
Choose the correct answer: Which belongs to the first trophic level?
A)
Grasshopper
B)
Hawk
C)
Mango tree
D)
Snake
10.
State True or False: Atmosphere is a biotic component of the ecosystem.
A)
TRUE
B)
FALSE
11.
Choose the correct answer: In lake ecosystem pyramid of biomass is________________.
A)
Upright
B)
Inverted
C)
Random shape
D)
None of these
12.
Choose the correct answer: In a food chain comprising lion, grass and deer, which will receive the minimum amount of energy?
A)
Grass
B)
Lion
C)
Deer
D)
All will receive same energy
13.
Choose the correct answer: The abiotic component is______________________.
A)
Animals
B)
Algae
C)
Fungus
D)
Soil
14.
Choose the correct answer: Food levels of an ecosystem is called______________________.
A)
Consumer levels
B)
Producer levels
C)
Trophic levels
D)
None of these
15.
Choose the correct answer: Which will contain the maximum amount of pesticides if a lake is polluted with the pesticides?
A)
Birds
B)
Microbes
C)
Small fishes
D)
Big fishes
17.
Write the common food chain in a pond.
18.
Choose the correct answer: Algal bloom results in____________________.
A)
Global warming
B)
Eutrophication
C)
Biomagnifaction
D)
None of these
19.
Choose the correct answer: The most stable ecosystem is____________________.
A)
Desert
B)
Forest
C)
Mountain
D)
Ocean
CBSE Class 10 Science Worksheet
Unit V: Natural Resources - Our Environment
Answers
1.
Option B
2.
Option C
3.
Option B
4.
Option D
5.
Because the energy captured by the autotrophs doesn't revert back to the solar input and it moves to the next trophic level progressively.
6.
Option C
7.
Producer
8.
Grass – Dear – Lion
9.
Option C
10.
Option B
11.
Option A
12.
Option B
13.
Option D
14.
Option C
15.
Option A
16.
As per this law, only 10 % of the energy entering a particular trophic level of organisms is available for transfer to the next higher trophic level.
17.
Algae – Protozoan – Small fish – large fish/bird
18.
Option B
19.
Option D
20.
Food web is a series of branching networks of various food chains being interconnected at various trophic levels.
