How is air useful to :
(a) water boats (b) agriculture
(c ) windmills (d) scooters and cars.

How does halogens react with (a) water (b) alkali and (c) metals

Which air pollutant is not released by scooters and cars?

How are Cry proteins useful in agriculture?

Fresh water is maximum used in (a) Drinking (b) Cooking (c) Agriculture (d) Pisciculture

Give two uses of the following components present in air : (a) oxygen (b) nitrogen (c ) carbon dioxide (d) water vapour

A solar water heater cannot be used to get hot water on : (a) a sunny day (b) a cloudy day ( c) a hot day (d) a windy day.

How is air dissolved in water different from ordinary air?

Nematodes are not found in (a) soil (b) freshwater (c) sea water (d) none of these

Which is water soluble? (a) Phycobilin (b) Carotene (c) Xanthophyll (d) Chlorophyll

Identify the solutions among the following mixtures. (a) Soil (b) Sea water (c ) Air (d) Coal (e ) Soda water.