NCERT Class 7 Science Chapter 17 Forests: Our Lifeline Extra Questions and Answers
Class 7 Science Chapter 17 Extra Questions and Answers – Forests: Our Lifeline. Here in this Page Class VII Students can Learn Extra Questions & Answer 17th Chapter Science fully Inside.
We Provided Here Forests: Our Lifeline Science Chapter 17 Long Answer Type Question, Very Short Type Questions (VSA) / MCQ Type Questions, Short Type Questions (SA).
Class 7 Science Chapter 17 Extra Question with Answer – Forests: Our Lifeline
Science Chapter 17 Forests: Our Lifeline Class 7 Inside 5 Marks, 3 marks, 2 Marks & And 1 Marks Important Questions and Answers.
1) Fill in the blanks:
a) ___ protect the soil from erosion. (Forests)
b) In a forest, ___ form the uppermost layer. (Trees)
c) A medicinal plant is ___. (Neem)
d) ___ helps forest to grow and regenerate? (Soil)
2) Multiple choice questions:
a) We get oil from ___ plant?
a) Neem b) Sandalwood
Ans. b) Sandalwood
b) ___plant is used as gum?
a) Neem b) Babool c) Sheesham
Ans. b) Babool
c) In a forest, ___ form the lowest layer?
a) Herbs b) Trees
Ans. a) Herbs
d) ___influence climate, water cycle and air quality?
a) Forests b) Soil
Ans. a) Forests
3) Answer the following questions:
a) What are decomposers? What is the function of decomposers?
Ans. The micro-organisms which convert the dead plants and animals to humus are known as decomposers.
The function of decomposers is to help in maintaining the supply of nutrients to the growing plants in the forest.
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b) How does plants and animals maintain the balance of oxygen and carbon dioxide?
Ans. Plants produce oxygen through photosynthesis which animals take for respiration. On the other hand, during respiration, animals release carbon dioxide in the air which plants take for photosynthesis. This is how plants and animals help each other and maintain the balance of oxygen and carbon dioxide.
c) What will happen if forests disappears?
Ans. If forests disappears then,
I.) The amount of carbon dioxide in air will increase, resulting in the increase of earth’s temperature.
II.) In the absence of trees and plants, the animals will not get food and shelter.
III.) In the absence of tree, the soil will not hold water, which will cause floods.
4) Match the information of column I with the items of column II:
|
Column I |
Column II |
| a) The micro-organisms act upon the dead plants to produce | 1) Rainwater |
| b) Forests maintain | 2) Canopy |
| c) The wide variety of animals helps the forests | 3) humus |
| d) The forest acts as a natural absorber of | 4) The water table |
| e) The brunches of tall trees look like a roof over other plants | 5) To regenerate and grow |
Ans. a) – 3), b) – 4), c) – 5), d) – 1), e) – 2).
5) By harboring greater variety of plants, the forest provides greater opportunities for food and habitat for the herbivores means increased availability of food for a variety of carnivores. The wide variety of animals helps the forest to regenerate and grow. Decomposers help in maintaining the supply of nutrients to the growing plants in the forest. Therefore, the forest is a ‘dynamic living entity’ — full of life and vitality.
a) The forest is a ‘dynamic living entity’ – explain.
Ans. The wide variety of animals helps the forest to regenerate and grow. Decomposers help in maintaining the supply of nutrients to the growing plants in the forest. Therefore, the forest is a ‘dynamic living entity’.
b) By harboring greater variety of plants, the forest provides greater opportunities for ___ and ___ for the herbivores. (Food and habitat)
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