Which of the following statements are “true” ?
- Water vapour is present in air only during the monsoon. ( )
- Water evaporates into air from oceans, rivers and lakes but not from the soil.( )
- The process of water changing into its vapour, is called evaporation.( )
- The evaporation of water takes place only in sunlight.( )
- Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.( )
Answer:
(a)
A small amount of water vapour is always present in the air.
So, the statement is False.
(b)
Soil loses water into the air from the surface of the leaves. The plants absorb water from soil and with the help of roots and this water evaporates from the leaves.
So, the statement is False.
(c)
The process of water changing into its vapour is called evaporation.
So, the statement is True.
(d)
Sunlight is not a necessary condition for evaporation. Evaporation may take place with or without sunlight.
So, the statement is False.
(e)
Water vapour condenses to form tiny droplets of water in the upper layer of air, where it is cooler.
So, the statement is True.
