Water Questions and Answers

Answer: A

The statement that is not true is 'Dams encourage sustainable growth'.

Large dams flood forests and farmland, alter river ecosystems, trap silt and displace communities, so they are widely criticised as not sustainable, even though the electricity itself is renewable.

The other statements are accepted as true: generating hydropower does not burn fuel, so it does not pollute air or water in operation; hydropower facilities can have large environmental impacts; and big dams have displaced many indigenous and river-dependent people, as the Narmada controversy showed.

Answer: D

The most suitable topic is Everyone does not get the facility of water equally.

EVS at the primary level starts from children's own lives and links them to social issues. Unequal access to water is something many children experience or see, so they can share experiences, discuss fairness and relate it to their surroundings, as the NCERT EVS books do.

Density, soluble substances and evaporation are scientific concepts better learnt through activity and observation than through experience sharing, and density in particular is too abstract for this level. Pairing the Dandi march with evaporation mixes a historical event with a concept and does not invite discussion of children's experiences.

Answer: A

A johad is a community based rain water harvesting system.

Johads are traditional crescent-shaped earthen check dams built across slopes in Rajasthan and neighbouring areas to collect rainwater. The stored water is used directly and also seeps into the ground, recharging wells. Villages in Alwar district revived many of them through community effort, and NCERT's EVS books use them as an example of traditional water management.

A johad does not filter water, pump groundwater or store river water; it collects rain runoff.

Answer: D

The statement that is NOT true is 'It is in use till today'.

The Class V NCERT EVS chapter 'Every Drop Counts' describes Ghadsisar, the lake made by King Ghadsi of Jaisalmer about 650 years ago and part of a chain of nine interconnected lakes, so that water overflowing from one filled the next. It then says that the lake is no longer in use, because many buildings and colonies have come up in between the nine lakes and the water no longer flows through them as before.

The other three statements are exactly what the chapter says: the king had it made, it dates from about 650 years ago, and it was connected with nine lakes. Only the last statement contradicts the textbook.