CBSE Class 5 EVS Water The Essence of Life Worksheet Set 01

Fill in the Blanks

Question. The salt in sea water makes it unfit for _____.
Answer: drinking
Explanation: Ocean and sea water contains too much salt, which can make us sick and dehydrated if we try to drink it.

Question. In some regions, people purify ocean water through a method called _____ to make it fit for drinking.
Answer: desalination
Explanation: Desalination is a special technology that takes the salt out of ocean water so that people can safely drink it.

Question. Water droplets form on the outer surface of a chilled glass due to the cooling of water _____.
Answer: vapour
Explanation: Invisible water vapour in the air touches the icy cold glass, cools down quickly, and turns into visible drops of liquid water.

Question. A grassy lawn helps in groundwater _____ much better than a concrete road.
Answer: recharge
Explanation: Soft soil and grass allow rainwater to soak deep into the earth, while hard concrete blocks the water and makes it run off.

Question. The river Narmada flows toward the _____ Sea.
Answer: Arabian
Explanation: Because the land slopes downward toward the west, the Narmada river flows westward into the Arabian Sea.

Question. Plants like the _____ have roots in the water bed, but their blossoms are seen above the water.
Answer: Lotus (or Water Lily)
Explanation: The lotus plant anchors its roots deep down in the pond mud, while its long hollow stems hold broad leaves and flowers up in the sunshine.

Question. When water boils vigorously, it turns into a gas known as _____.
Answer: steam (or water vapour)
Explanation: Heat gives water energy to expand and float up into the air as hot gas or steam.

Question. A duck uses its _____ feet to paddle smoothly through the pond.
Answer: webbed
Explanation: Skin connects a duck's toes like little swim fins, pushing against the water to help it glide easily.

True or False

Question. Most of the water on Earth can be easily used for farming without any treatment.
Answer: False
Explanation: About 97% of Earth's water is salty ocean water, which damages most crops and cannot be used for farming.

Question. Rainwater soaks into the soil more effectively in a forest than in a cemented city.
Answer: True
Explanation: Forest soil is loose and full of plant roots that act like a sponge, whereas paved roads and buildings stop water from sinking in.

Question. A plain sheet of paper repels water drops just like wax paper does.
Answer: False
Explanation: Plain paper quickly absorbs water and becomes soggy, while waxy paper has a waterproof coating that keeps droplets round and sitting on top.

Question. Water animals breathe using lungs while swimming deep underwater.
Answer: False
Explanation: Most aquatic animals like fish use special organs called gills to take oxygen directly out of the water.

Question. The river Ganga empties its water into the Bay of Bengal.
Answer: True
Explanation: The holy river Ganga flows across northern and eastern India before emptying into the Bay of Bengal.

Question. If a region receives no rainfall for two consecutive years, it can lead to severe drought.
Answer: True
Explanation: Without rain, wells run dry, ponds disappear, crops cannot grow, and a severe water shortage called drought occurs.

Questions / Short Question Answers

Question. Why can we not consume the water present in the oceans?
Answer: Ocean water contains very high levels of dissolved salts, which makes it unfit for drinking and harmful to our kidneys.
Explanation: Human bodies need freshwater. Drinking salty ocean water actually makes you thirstier and makes you sick.

Question. What happens to ice cubes when they are left inside a cup for some time?
Answer: The ice cubes absorb heat from the surrounding air, melt, and transform from solid ice into liquid water.
Explanation: Heat from the room warms the ice above its freezing point (0°C), causing it to turn back into liquid.

Question. Why do numerous living beings make their homes near water bodies?
Answer: Water is essential for all life; water bodies supply drinking water, food like fish and edible greens, and fertile land for plants.
Explanation: Animals and plants need water every day to survive, so living near a river or lake ensures they never go thirsty or hungry.

Question. Why do some Indian rivers flow toward the Arabian Sea while others travel toward the Bay of Bengal?
Answer: Water always flows downhill along the natural slope of the land; regions sloping east send rivers to the Bay of Bengal, while westward slopes send rivers to the Arabian Sea.
Explanation: Just like mustard seeds rolling down a tilted board, river water always follows the downward tilt of the ground.

Question. What will occur if it does not rain in an area for two years?
Answer: Rivers and lakes will dry up, farm crops will fail, groundwater will sink very low, and both people and animals will suffer from drought and food scarcity.
Explanation: Rain is the main source that refills our fresh water. Without it, our taps, fields, and wells run out of water.

Question. How does a wax crayon drawing prevent water from soaking into a piece of paper?
Answer: The wax in the crayon forms an oily, waterproof layer that water cannot pass through, forcing the water to stay on top as round droplets.
Explanation: Wax and water do not mix! The wax acts like an invisible raincoat over the paper fibers.

Question. What smart features can be included in a school building to conserve water wisely?
Answer: Rainwater harvesting pipes, soak pits to refill groundwater, push-taps that turn off automatically, and gardens planted in real soil.
Explanation: Catching rain from the roof and using taps that do not leak keeps clean water from being wasted.

Question. How is a duck's bill shaped differently from a pond heron's beak?
Answer: A duck has a wide, flat bill designed for scooping plants and insects from water, while a heron has a long, sharp, pointed beak for spearing fish.
Explanation: Birds' beaks are shaped like the tools they need to hunt their favorite food in the water.

Question. What are two distinct ways ocean water can be used by people?
Answer: Ocean water can be evaporated in salt pans to produce table salt, and it can be used for sea transport and shipping.
Explanation: When the hot sun dries ocean water in shallow beds, pure white salt crystals are left behind for us to use in cooking.

Question. Why does urban rainwater often cause waterlogging instead of recharging groundwater?
Answer: Most surfaces in cities are paved with tar and concrete, preventing water from sinking into the ground and forcing it to flood roads.
Explanation: Concrete cannot absorb water. With nowhere into the earth to go, rain fills up streets and drains instead.

Match the Following

Question. Match each form of water in Column A with its correct description in Column B:

Explanation: Water changes its state depending on temperature: it freezes into solid ice or snow, boils into gas steam, and falls from clouds as liquid freshwater.

Question. Match each Indian river with the sea into which it empties:

Explanation: Most major rivers in India flow eastward toward the Bay of Bengal, but a few like the Narmada and Tapti flow westward into the Arabian Sea.

Vocabulary Activity - "Guess the Word"

Question. Guess the Word: I am the natural process by which liquid water warms up in the sun and turns into gas. What am I?
Answer: Evaporation
Explanation: Evaporation happens when heat turns puddles, lakes, and oceans into invisible water vapour that rises into the sky.

Question. Guess the Word: I am the cooling process where water vapour turns back into tiny liquid drops, like on the outside of an iced tumbler. What am I?
Answer: Condensation
Explanation: Condensation is the exact opposite of evaporation; cooling down makes gas turn back into liquid drops.

Question. Guess the Word: I am a method used to remove salt from seawater to make it suitable for drinking. What am I?
Answer: Desalination
Explanation: Desalination plants boil or filter salty seawater under high pressure so people in desert coastal areas can have sweet drinking water.

Question. Guess the Word: I am water stored deep beneath the ground in soil and rock layers that can be drawn from wells. What am I?
Answer: Groundwater
Explanation: Rainwater that seeps deep into the soil gets stored like an underground reservoir, which we reach using borewells and handpumps.

Question. Guess the Word: I am a conservation system that collects and stores rainwater from rooftops for later use. What am I?
Answer: Rainwater harvesting
Explanation: Rainwater harvesting captures clean rain falling on house roofs and channels it into storage tanks instead of letting it wash away into drains.