Question

of neutralisation with the help of an
3. a) What is meant by the following terms?
1) Rearing in) Shearing ili) Sericulture
(or)
b) Discuss why wearing more layers of clothing during winter keeps us
warmer than wearing just one thick piece of clothing?
4. a) State difference between acids and bases.
(or)
b) Explain how soil is formed.
5. a) While playing in a park, a child was stung by a wasp. Some elders
suggested applying paste of baking soda and others lemon juice as
remedy. Which remedy do you think is appropriate and why? (HOT-
Question)
(or)
b) Why is soil erosion relatively less in dense forests as compared to
barren, open fields? (HOT-Question)​

Answer 1

Explanation:

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Answer 2

Answer:

3.b) When we wear multiple layers of clothes, the air gets trapped between the clothing layers and prevents heat loss from our body. So, multiple layers keep us warmers as compared to a single layer.

4.b) The soil is created by the process of weathering or disintegration of parent rocks by physical, chemical and biological agents. It is a slow process that takes thousands of years. The physical and chemical decomposition is principally done by water, wind, and climate.

5.b) In dense forests, the tree cover (canopy) prevents rain water from directly falling on the’ ground/soil. Also roots of the vegetation bind the soil particles and hold them together. As a result soil erosion is minimized. But in barren, open fields the soil is exposed to the falling rain. The soil particles become loose due to the impact of raindrops and the flow of water carries them away The flowing water further erodes the soil surface aggravating erosion.

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