Give reasons:
When there are riots, the cities, town or villages show signs of tense atmosphere.

Give reason: Ethers should not be exposed to atmosphere.

Give scientififc reasons When the gas formed on heating limestone is passsed through freshly prepared lime water,the lime water turns milky.

Give scientific reasons: We feel tired when we do exercise.

Give reasons : When a bottle containing mustard seeds shaken vigorously, the seeds move away from each other and stick to the bottle.

Give reasons: Through the atmosphere contains 78% of molecular nitrogen, still the soil is the main source of nitrogen for plants.

Assertion : When there is a thin layer of water between two glass plates , there is a strong attraction between them . Reason : The pressure between the plate becomes less than atmospheric pressure because pressure inside a bubble or drop is greater than outside pressure.

Give reasons : Why does your mother put folded cloth strips soaked in cold water on your forehead when you have high fever ?

Give scientific reasons: When you enter a warm room after being outside on a frosty early morning ,your spectacles ' steam up'.

Give scientific reasons: When a bullet fired from a gun strikes the target, the target becomes hot.