PSEB Punjab Board Class 7 Science Textbook Solution Chapter 17 Forests: Our Lifeline Exercise Questions and Answers
Chapter 17 Forests: Our Lifeline
Q.1 Fill in the blanks:
(i) Animals helps plants in the ……………… of seeds.
Answer: formation.
(ii) ………………… gas is released by plants during photosynthesis.
Answer: Oxygen.
(iii) …………….. and ……………….. are major threats to forest.
Answer: Fire, Pollution.
(iv) Large scale planting of tree sapling is called …………….. .
Answer:- Afforestation.
Q.2 True or false:
(i) Animals provide nutrients to plants.
Answer: False
(ii) The forest cover in India is only 15% of its total land area.
Answer: False
(iii) Crown is the shape of the trees.
Answer: True
(iv) Deforestation is cutting of trees to clear area for building houses and farming.
Answer: True
(v) Deforestation takes place due to overgrazing.
Answer: True
Q.3 Match the following.
Answer:-
1. Plants :- d. Producers.
2. A renewable natural sources :- a. Forest.
3. Afforestation :- b. Practice of planting trees on a largescale.
4. Removal of plants :- c. Deforestation
Q.4 Choose the correct answer.
(i) Which of the following is not a forest product ?
(a) Plywood
(b) Kerosene
(c) Sealing wax
(d) Gum.
Answer: (b) Kerosene.
(ii) A food chain includes:
(a) Producers and herbivores
(b) Producers and carnivores
(c) Producer and decomposers
(d) Producers, herbivores and carnivores.
Answer: (d) Producers, herbivores and carnivores.
(iii) Bacteria and fungi act as:
(a) Decomposers
(b) Herbivores
(c) Omnivores
(d) Carnivores.
Answer: (d) Carnivores.
(iv) Microorganisms act upon the dead organisms to produce:
(a) Humus
(b) Wood
(c) Soil
(d) All of these
Answer: (a) Humus.
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