(Section-C) Q4. Answer the following in one line. ( 10 X 2 = 20 ) (i) Name the impurities which make the water unfit for use? (ii)What is a sewer system? (iii) What is GAP? What does it aim at? (iv)What is a food chain? (v) Name the different layer of forest. (vi)What is deforestation? (vii) What is the Chipko Movement? (viii) What are Aquifers? (ix) What are dams? (x) What do you mean by water table? Q6. Give answers for the following questions.(60-80 Words) ( Any One) ( 5 X 1 = 5 ) (i) Elaborate on how forests are important to us. OR (ii) What is food web? Explain it with diagram.
Answers
Answer:
which terms is used for celebration of planting of saplings on a large scale?
ii. What do we call to the branched part of a tree above the stem?
iii. Name the sequence of living organisms in which one eats another.
iv. What name is given to the different horizontal layers created by different types and sizes of trees.
v. Which part of the forest helps in recharging of the ground water.
vi. Name the term used for cutting of trees at large scale.
vii. Name the practice of planting trees to save environment from the bad effects of deforestation.
Solution
i. Van Mahotsav
ii. Crown
iii. Food chain
iv. understoreys
v. Forest floor
vi, Deforestation
vii. Afforestation
Unscramble the Jumbled word
Question 4
a. OCANYP
b. ERTOEITSDONFA
c. NSEDUETOYRR
d. ODCEPSREOMS
Solution
a. Canopy
b. Deforestation
c. Understorey
d. Decomposers
Multiple Choice Questions
Question 5
i. Forests are not responsible for
(a) providing medicinal plants.
(b) maintaining the flow of water into the streams.
(c) creating flood conditions.
(d) absorbing rainwater and maintaining water table.
ii. Which of these is the correct food chain
(a) Grass -> insects -> frog -> snake -> eagle
(b) frog → eagle → insects → grass → snake
(c) insects -> frog -> grass -> snake -> eagle
(d) eagle -> snake -> frog -> grass-> insects
Solution
i. (c)
ii. (a)
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Question 6

Across
5. plants release oxygen through the process
Down
1. Forests influence ______, water cycle and air quality
2. This serves as green lung of nature
3. branchy part of a tree above the stem
4. The micro-organisms which convert the dead plants and animals to humus are known as
6. A dark coloured substance
Solution
1. climate
2. forests
3. crown
4. Decomposers
5. photosynthesis
6. Humus
Short Answer type
Question 7
Define a food chain?
Question 8
Name a tree with a tall canopy?
Question 9
What is a food web?
Question 10
Name two decomposers that may be seen on the forest floor?
Question 11
Name two animals that hunt from the emergent layer?
Long Answer type Questions
11. Why are forests called the green lungs of the earth?
12. How do trees grow in a natural forest?
13. Why is it necessary to conserve forest? State any two ways to conserve forests.
14. What is food chain? Give one example of a food chain taking place in a forest.
15. State the reasons for large scale cutting down of forest trees.
16. What kind of plants grow in the Understorey of a forest?
17. Write a note on the different types of consumers?
18. How does a forest prevent soil erosion? Mention two human activities that can damage a forest floor?
19. Write a short note on how forests are like big check dams?
20. Illustrate a simple Food Chain and describe it?
21. What are decomposers? Do they help in keeping the forest clean? How do decomposers enrich forest soil?
22. List any two useful forest products? Explain the uses of forests?
23. How is a food chain formed? Give an example?
24. What are the effects of deforestation? List the reasons for the destruction of forests?
55. Suggest some ways to conserve forest?