Q5 of 216 Page 478

Management of forest and wildlife resources is a very challenging task. Why? Give any two reasons.

Management of forest and wildlife resources is a very challenging task because of the following:


(i) Now-a-days, people are are continuously cutting down trees for the raw materials of the factory.


(ii) People kill animals for making cloth designs and its harming wildlife. So the management of forest and wildlife is a very challenging task.


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3

Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

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List two biotic components of a biosphere.

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i. Give an example for a combination reaction which is exothermic.

ii. Identify the oxidising agent, reducing agent in the following reaction:


H2S + Cl2⇒ 2HCl + S


iii. Name the phenomenon due to which the taste and smell of oily food changes when kept for a long time in open. Suggest one method to prevent it.

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A reddish brown coloured metal, used in electrical wires, when powdered and heated strongly in an open china dish, its colour turns black. When hydrogen gas in passed over this black substance, it regains its original colour. Based on the above information answer the following questions.

i. Name the metal and the black coloured substance formed.


ii. Write balanced chemical equations for both the reactions.