Give reason for: We usually do not see bright colors in dim light.

How do we see colours ?

Give reason for: During severe cough and cold we lose taste of food.

Give reasons. We can't identify taste when food is very hot.

Give reasons. We can’t identify taste when food is very hot.

Give reasons: We cannot identify the taste of grape fruit, when it is placed on the tongue.

how do we see movies

Give reasons – Though we have a number of ponds, rivers we do not have drinking water.

Why do fish and frog lay more number of eggs whereas cow and human beings usually give birth to only one at a time?

Give reasons (a) Platinum, gold and silver are used to make jewellery. (b) Sodium, potassium and lithium are stored under oil. (c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking. (d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.

State the reason why light nuclei usually undergo fusion and heavy nuclei usually undergo fission.