Chapter 1: Water—The Essence of Life Case Study Questions | Environmental Science - EVS Class 5 CBSE

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Chapter 1: Water—The Essence of Life Case Study Questions | Environmental Science - EVS Class 5 CBSE | ByteNotes.in

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Case Set 1

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Afreen and Jyoti were sitting by the window during a heavy rainstorm. They watched as tiny raindrops slid down the glass. Afreen started wondering where all this water came from and where it would go once the rain stopped. Their teacher had told them that water is always moving in a circle. They decided to make a small model using a plastic bag, some blue water, and sunlight to see the magic of the water cycle for themselves.

Question 1: What is the continuous circular movement of water in nature called?

It is called the water cycle.
It shows how water moves between the air, land, and sky.

Question 2: What happens to the water inside the plastic bag when it is placed in sunlight?

The Sun's heat causes the water to turn into water vapour.
This vapour then cools down to form small water droplets inside the bag.

Question 3: In the real world, how does the water from oceans return to the land as rain?

Heat causes water from oceans and rivers to become water vapour.
This vapour forms clouds in the sky.
Eventually, the water falls back down as rain, snow, or hail.

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Case Set 2

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During a kitchen experiment, Rohan took a steel glass and filled it with ice cubes. After a few minutes, he saw tiny water droplets forming on the outer surface of the glass. He then asked his mother to heat some water in a pan. He saw steam rising from the pan and disappearing into the air. He realized that water can change into many different things just by changing the temperature around it.

Question 1: Name the three forms of water mentioned in the chapter.

Water exists in liquid form like rain.
It exists in solid form like ice or snow.
It exists as vapour like steam.

Question 2: Where did the water droplets on the outside of the cold steel glass come from?

The droplets come from the water vapour present in the air.
The vapour cools down when it touches the cold glass and turns into liquid.

Question 3: What happens to water when it is heated and when it is frozen?

Heating water turns it into water vapour or steam.
Freezing water turns it into solid ice.
Water can change back and forth between these forms.

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Case Set 3

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Meera lives in a big city with many concrete roads and tall buildings. During the rainy season, she noticed that water puddles stayed on the road for a long time or flowed into drains. When she visited her grandmother's village, she saw that the rain disappeared into the grassy ground almost immediately. Her grandmother told her that the ground 'drinks' the water to store it for later use through handpumps.

Question 1: What is the water that gets stored deep underground called?

It is called groundwater.
It sinks through layers of soil and rocks to get stored.

Question 2: Why can't rainwater go into the ground easily in cities?

Cities have many cemented and concrete surfaces.
These hard surfaces stop rainwater from soaking into the ground.

Question 3: List three ways that help rainwater return to the ground underground.

Using soak pits and ponds helps water seep in.
Creating human-made lakes and planting more trees.
Leaving open, uncovered areas like green lawns.

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Case Set 4

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Ravi's family took a trip to Gujarat. They visited vast, flat lands near the coast that looked white like snow. His father explained that these were salt pans. Ravi saw people working in the sun, moving water around in shallow square pits. He learned that this is how the salt we use in our food every day is made from the giant oceans that cover most of our blue planet.

Question 1: What are salt pans and where are they found in India?

Salt pans are vast flatlands where seawater is dried to collect salt.
They are located in Gujarat, which is a major salt-producing area.

Question 2: Why can't we use ocean water directly for drinking or growing crops?

Most of the water on Earth, like ocean water, is salty.
Saltwater is not fit for drinking or for farming activities.

Question 3: Use the glass and teaspoon example to explain the availability of freshwater.

Imagine if all the water on Earth were in one glass.
The freshwater we can use would only be as much as a single teaspoon.
This shows that freshwater is a very limited resource.

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Case Set 5

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Afreen and Jyoti went to the school pond after the rain. They saw tiny fish swimming quickly and a small frog sitting quietly on a big lotus leaf. Afreen noticed that even though the lotus leaf was in the water, it didn't look wet or soggy. She saw water droplets rolling off it like little beads of glass. They realized that every living thing in the pond has special ways to live in water.

Question 1: What special feature do fish have to help them move in water?

Fish have fins that help them swim through the water.
They also have special mouth shapes for feeding in water.

Question 2: Why don't the leaves of plants like the lotus get damaged by staying in water?

They have a waxy coating on their leaves.
This coating makes them waterproof and keeps out too much water.

Question 3: What would happen to the pond animals if all the fish disappeared?

It would break the food chain because many animals eat fish.
Predators like the Pond Heron would have no food to catch.
The whole river ecosystem depends on each member for survival.

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Chapter sections

Chapter 1: Water—The Essence of Life | Case Study Questions

Passage

Question 1: What is the continuous circular movement of water in nature called?

Question 2: What happens to the water inside the plastic bag when it is placed in sunlight?

Question 3: In the real world, how does the water from oceans return to the land as rain?

Passage

Question 1: Name the three forms of water mentioned in the chapter.

Question 2: Where did the water droplets on the outside of the cold steel glass come from?

Question 3: What happens to water when it is heated and when it is frozen?

Passage

Question 1: What is the water that gets stored deep underground called?

Question 2: Why can't rainwater go into the ground easily in cities?

Question 3: List three ways that help rainwater return to the ground underground.

Passage

Question 1: What are salt pans and where are they found in India?

Question 2: Why can't we use ocean water directly for drinking or growing crops?

Question 3: Use the glass and teaspoon example to explain the availability of freshwater.

Passage

Question 1: What special feature do fish have to help them move in water?

Question 2: Why don't the leaves of plants like the lotus get damaged by staying in water?

Question 3: What would happen to the pond animals if all the fish disappeared?

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