List two biotic components of a biosphere.

Write the molecular formula of first two members of homologous series having functional group – Cl.

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

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

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.