Class 7 Science Chapter 7 MCQ Forests Our Lifeline
MCQ on Forests Our Lifeline Class 7
Select and write the most appropriate option out of the four options given
I. Multiple Choice Questions
Question 1.
Which of the following statements are correct regarding forest?
i) It serves as green lungs.
ii) It influences climate, water cycle and air quality.
iii) It is a cause of soil erosion.
iv) It is home for plants and animals.
A) (i) and (iv)
B) (i), (iii) and (iv)
C) (i), (ii) and (iv)
D) (ii) and (iii)
Answer:
C) (i), (ii) and (iv)
Question 2.
………….. is the branchy part of a tree above the stem.
A) Canopy
B) Crown
C) Understorey
D) Forest floor
Answer:
B) Crown
Question 3.
Study the food chain given below.
Here, the population of wolf will increase due to
i) decrease in population of tigers
ii) increase in population of squirrels.
iii) increase in population of plants.
A) Only (i)
B) Only (ii)
C) (i) and (ii)
D) (i), (ii) and (iii)
Answer:
D) (i), (ii) and (iii)
Question 4.
Forests are not responsible for
A) providing home for many animals and plants.
B) providing oxygen for respiration
C) providing medicinal plants.
D) causing floods and droughts.
Answer:
D) causing floods and droughts.
Question 5.
…………. convert dead plants and animals into a dark-coloured substance called humus.
A) Autotrophs
B) Heterotrophs
C) Saprotrophs
D) Producers
Answer:
C) Saprotrophs
Question 6.
Which of the following is a consequence of deforestation?
i) Decreased rainfall
ii) Decrease in carbon dioxide amount in air
iii) Soil erosion
iv) Floods and droughts
A) (i) and (ii)
B) (i), (ii) and (iv)
C) (i), (iii) and (iv)
D) (i), (ii) and (iii)
Answer:
C) (i), (iii) and (iv)
Question 7.
Select the incorrect statements.
i) Plants provide food and shelter only to animals.
ii) Plants replenish the air with carbon dioxide.
iii) Animals disperse seeds of some plants.
iv) Plants provide us timber, honey, wax, gum, medicines, etc.
A) (i), (ii) and (iii)
B) (ii), (iii) and (iv)
C) (i) and (ii)
D) (iii) and (iv)
Answer:
C) (i) and (ii)
Question 8.
Given below are different shapes of crown of some trees. Which of the above trees would be most suitable for growing along a walkway that gets heated in the daytime due to bright sunlight.
A) (I)
B) (II)
C) (III)
D) (IV)
Answer:
D) (IV)
Question 9.
Study the given flow chart.
What is the name of process ‘ X ‘ in the figure?
A) Respiration
B) Digestion
C) Feeding
D) Photosynthesis
Answer:
A) Respiration
Question 10.
Forest can prevent
i) floods
ii) soil erosion
iii) decrease in the level of water table
iv) deforestation.
A) (i) and (ii)
B) (ii) and (iv)
C) (i) and (iv)
D) (i), (ii) and (iii)
Answer:
D) (i), (ii) and (iii)
Question 11.
The lowest layer in the understorey is formed by
A) herbs
B) shrubs
C) grasses
D) trees.
Answer:
A) herbs
Question 12.
In the following food chain, decomposers are represented by
A) I
B) II
C) III
D) IV
Answer:
D) IV
II. Fill in the blanks
1. ………… are microorganisms that convert dead plants and animals into humus.
Answer: Decomposes
2. ………… is the branches of tall trees over the other plants in the forest.
Answer: Canopy
3. ………… form the lowest layer in understoreys.
Answer: Herbs
4. Animals help in the process of seed …………
Answer: dispersal
5. All food chains are ………… in forest.
Answer: linked
6. Forests protect ………… and provide ………… to a large number of animals.
Answer: soil, shelter
7. ………… maintain the balance of oxygen and carbon dioxide in the atmosphere.
Answer: Forests
8. The ………… in the forest is enriched by decaying leaves and animal droppings.
Answer: soil
9. Plants release oxygen during the process of …………
Answer: Photosynthesis
10. Decomposers, such as ………… and ………… help in recycling of nutrients.
Answer: bacteria, fungi
11. A ………… shows the type of food eaten by an organism and the interrelationship between different plants and animals for food in a certain habitat.
Answer: food chain
12. ………… are animals that eat only plants.
Answer: Herbivores
13. ………… is the layer of forest which stops sunlight and rain by its thick foliage.
Answer: Canopy
14. Crow, jackal and hyena are examples of …………
Answer: Scavenger
15. ………… can lead to an increase in the level of ………… in the atmosphere which results in an increase in global temperature.
Answer: A warming climate, Carbon dioxide
16. Forests also act as natural absorber of ………… and allow it to seep into the ground.
Answer: Rain water
17. Carbon dioxide, ………… and ………… are some greenhouse gases.
Answer: methane, hydrofluro carbons
18. Herbivores are ………… consumers and carnivores are ………… consumers.
Answer: primary, secondary
19. The position that an organism occupies in a food chain is called …………
Answer: tropic level
20. Removal of top fertile layer of soil by wind or rain is called ………….
Answer: soil erosion
III. True Or False
1. Many food chains independently exist in forest.
Answer: False
2. Forests protect the soil from erosion.
Answer: True
3. Forests act as a natural absorber of rainwater.
Answer: True
4. Forests cause floods as they help in bringing heavy rainfall.
Answer: False
5. Vegetation that grows under the shade of tall trees is called crown.
Answer: False
6. Every part of the forest is dependent on each other.
Answer: True
7. In the absence of trees, the amount of carbon dioxide in air will decrease
Answer: False
8. Noise pollution is more in the places near the forest.
Answer: False
9. The canopy layer of forests intercepts the flow of rain.
Answer: True
10. Larger number of herbivores means decreased availability of food
Answer: False
IV. Matching
| Column-I | Column-II |
| i) Herbivores | a) Bacteria and fungi |
| ii) Carnivores | b) Green plants |
| iii) Producers | c) Wolf and lion |
| iv) Decomposers | d) Deer and buffalo |
A) (i) – b, (ii) – d, (iii) – c, (iv) – a
B) (i) -d,(ii) – c, (iii) – b, (iv) – a
C) (i) – d, (ii) – a, (iii) – b, (iv) – c
D) (i) -c ,(ii) – d, (iii) – a, (iv) – b
Answer:
| Column-I | Column-II |
| i) Herbivores | d) Deer and buffalo |
| ii) Carnivores | c) Wolf and lion |
| iii) Producers | b) Green plants |
| iv) Decomposers | a) Bacteria and fungi |