Worksheet Solutions: Water Resources - 1

Q1: Complete the sentences.

(i) Agriculture is not possible without _____________.
Ans: water

Farming needs water because crops must have water to grow. Water helps plants take up the food and minerals from the soil and keeps them healthy.

(ii) Oceans are the largest source of __________________.

Ans: surface water

Oceans are the biggest source of surface water. About 97% of all Earth's water is found in oceans and seas, so they are the largest store of surface water.

(iii) Water is the most __________________ resource.

Ans: important

Water is one of the most important resources for life. Lakes, rivers and other fresh water sources are very valuable for people, animals and plants because they provide the water needed for drinking, farming and other uses.

(iv) Water taken out of wells, hand pumps or tube wells is the ______________ water.
Ans: underground

Groundwater is the water found below the ground. It collects in spaces and cracks in the soil and rocks. People get this water by digging wells or using pumps.

(v) Surface water is the water available from rivers,_______________.

Ans: oceans, ponds

Surface water means the water we see on the land, such as in rivers, lakes, ponds, seas and oceans. These are the main places where surface water is found.

(vi) Rainwater soaks into the ground and fills _________.

Ans: Wells

When rainwater soaks into the soil, it fills the spaces underground. Wells are made to reach this underground water so people can take it out for use.

(vii) Boiling water removes the _________.
Ans: germs
Boiling water kills many germs and makes the water safe to drink. This is a simple way to clean water if you do not have other filters.

(viii) Boiling water changes it into _________.
Ans: steam
When water is boiled, it becomes steam (a gas). This happens because heat makes the water change from liquid to gas.

(ix) We need more water in summer because we _________.
Ans: sweat
In hot weather, we sweat more to cool our bodies. Because of this, we lose water from our body and must drink more to stay healthy.

(x) Plants take in water from the _________.
Ans: ground
Plants absorb water from the soil through their roots. This water helps them grow and make food.

Q2: True or False.

(i) We waste water when we allow water to run while we brush our teeth.
Ans: True
Explanation: Letting water run while brushing wastes a lot of clean water that could be saved. We should turn off the tap while we brush.

(ii) Water is as important to us as the air.
Ans: True
Explanation: Both clean water and clean air are needed for our bodies to grow and stay healthy. We cannot live long without either of them.

(iii) A major part of our body weight is water.
Ans: True
Explanation: A large part of the human body is made up of water. Water helps our body work, such as moving blood, digesting food and keeping our temperature steady.

(iv) Agriculture is possible without water.
Ans: False
Explanation: Farming needs water for crops to grow. Without enough water, crops cannot get the nutrients they need and will not grow well.

(v) Water will never exhaust. (used up).
Ans: False
Explanation: Although water keeps moving in the water cycle, the amount of fresh water we can use is limited. Fresh water may become scarce if it is wasted or polluted.

Q3: Tick the correct word.

(i) Distribution of water is_____________(even, uneven)
Ans: uneven
The distribution of water on Earth is not the same everywhere. Most water is in the oceans. Only a small part of Earth's water is fresh water that people and animals can use.

(ii) Water is polluted by_____________. ( fish, rain, untreated sewer water)
Ans: untreated sewer water

When dirty wastewater is released into rivers, lakes or the sea without treatment, it pollutes the water. This makes the water unsafe for people, animals and plants.

(iii) Rain harvesting is____________(collection of water from the rain)

Ans: a collection of water from the rain

Rainwater harvesting means collecting and storing rainwater from roofs or other surfaces so it can be used later for drinking, washing or watering plants.

(iv) Water in clouds come from_____________(underground, surface and ocean water)
Ans: surface and ocean water
Water from oceans, rivers and lakes evaporates into the air when heated by the Sun. This vapour rises, cools and forms clouds.

(v) Floods can be controlled to some degree by _____________(forestation, cutting trees)
Ans: forestation

Trees and forests help hold the soil and slow down rainwater run-off. This reduces sudden flooding and protects the land.

Q4: Multiple Choice Questions (MCQs).

(i) The three forms in which water is found are -
(a) solid, liquid, water
(b) solid, ice, water
(c) steam, ice, gas
(d) ice, water, steam
Ans: (d)
Explanation: Water exists in three states: solid (ice), liquid (water) and gas (steam or water vapour). Which form appears depends on the temperature.

(ii) What will happen to the ice if it is left out?
(a) The ice melts to form water.
(b) The ice freezes to form water.
(c) The water freezes to form ice.
(d) The water melts to form ice.
Ans: (a)
Explanation: If ice is kept where the temperature is above freezing, it gets warmer and melts into liquid water. Melting is the change from solid to liquid.

(iii) What is a filter used for?
(a) It removes dirt from water.
(b) It makes the water warm.
(c) It cools water.
(d) It makes water salty.
Ans: (a)

Explanation: A filter removes dirt and tiny particles from water so the water becomes cleaner. Filters help make water safer to use.

(iv) The Sun heats up water in the ponds and changes it into -
(a) ice
(b) steam
(c) water
(d) water vapour

Ans: (d)

Explanation: When the Sun heats water in ponds or lakes, some of it changes into water vapour (a gas) and rises into the air. This process is called evaporation.

Q5: Answer the following questions.

(i) How is surface water resource different from the underground water resource?
Ans: Surface water is the water we see on the land, such as in rivers, lakes, ponds and the sea. Underground water, or groundwater, is stored below the ground in soil and rocks and is reached by wells and pumps.

(ii) What is the meaning of water resources?
Ans: Water resources are the natural and man-made places where we get water for use. These include surface water like rivers and lakes, underground water in wells, and methods such as rainwater harvesting or treated water that people prepare for use.