Water Test 1

As solids are measured in kilograms, in the same way liquids are measured in litres. For example, 1 litre of water or 3 litres of milk.

The phenomenon of remaining on the surface of a liquid without sinking is called floatation.

As boat floats, in the same way a rock sinks.

Ducks, crocodiles and seals are all amphibious and can live on both land and water whereas fishes are odd one out who live only in aquatic environment.

Springs is the odd one out as it is a groundwater source of water whereas rivers, lakes and reservoirs are all surface-water sources of water.

Aquatic plants are also known as hydrophytes. 'Hydro' means water and 'phytes' means plants.

Mosquitoes and other insects breed profusely in stagnant water that is not flowing. Mosquitoes lay their larvae in them which grow to form the infected malaria causing mosquitoes.

A is the correct option.In earlier times, water was not as easily available as it is available today.

The water kept in an earthen pot remain cool even in summer because earthen pot has many small holes. Water seeps out through them and evaporates from the surface of the pot. The energy needed for evaporation is taken from the water kept in the earthen pot. As a result, water kept in earthen pot become cool.

Stagnant water is more prevalent in the rainy season as the water from the rains gets collected in the pits and potholes and does not get drained thus remaining at one place and becoming a breeding ground for insects.