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

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

Application Question

Medium difficulty • Concept in a practical situation

Medium

Question 1

Applied Concept

Imagine you are in a boat in the middle of the ocean and you are very thirsty. Can you drink the ocean water? Why or why not?

No, you cannot drink the ocean water because it is extremely salty.
The human body needs freshwater to survive, and drinking very salty water can actually make you sicker.
The textbook explains that most water on Earth is salty, which is why freshwater is so precious for our survival.

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Application Question

Medium difficulty • Concept in a practical situation

Medium

Question 2

Applied Concept

If you leave a cold bottle of water on your desk on a hot day, you will soon see tiny water droplets on the outside of the bottle. Where did this water come from?

These droplets come from the invisible water vapour that is present in the air around the bottle.
When the warm air touches the cold surface of the bottle, the vapour cools down and turns back into liquid water.
This is the same process that happens in nature when vapour cools to form clouds in the sky.

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Application Question

Hard difficulty • Concept in a practical situation

Hard

Question 3

Applied Concept

Your neighborhood is replacing all the grassy parks with concrete parking lots. How will this change affect the water under the ground?

The concrete will act as a waterproof layer that prevents rainwater from soaking into the soil.
Because the water cannot sink down, the groundwater stores will not get recharged or refilled.
The text mentions that uncovered areas are needed for groundwater recharge, so the concrete will cause the water level to drop over time.

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Application Question

Medium difficulty • Concept in a practical situation

Medium

Question 4

Applied Concept

If a farmer in Rajasthan builds a Johad on his land, how does it help him during the dry summer months?

The Johad collects and stores rainwater during the monsoon instead of letting it run away.
This collected water slowly seeps into the earth, refilling the underground stores near the farmer's well.
By recharging the groundwater, the farmer will have enough water to pump out even when it is not raining in the summer.

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Application Question

Medium difficulty • Concept in a practical situation

Medium

Question 5

Applied Concept

You see a lotus leaf in a pond and notice that it is not rotting or getting soggy even though it lives in water. Why is this?

The lotus leaf has a special waxy coating on its surface that makes it waterproof.
This coating prevents too much water from entering the plant and damaging its healthy tissues.
Activity 9 in the book shows that water droplets slide off waxy surfaces just like they do on these healthy aquatic leaves.

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Application Question

Hard difficulty • Concept in a practical situation

Hard

Question 6

Applied Concept

If all the small fish in a river suddenly disappeared, what would happen to the birds like the Pond Heron that live there?

The Pond Heron depends on small fish as its primary source of food.
Without the fish, the heron would have nothing to eat and would either have to leave or might not survive.
This shows how all living beings in a river are connected through a food chain as explained in Activity 10.

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Application Question

Medium difficulty • Concept in a practical situation

Medium

Question 7

Applied Concept

A river is flowing through a hilly area. Suddenly, it encounters a very large, hard rock in its path. What do you think the water will do?

The water will flow around the rock or stop and pool up if it cannot find a way through.
Water always changes its path or curves according to the shape of the land in its way.
This behavior is what Activity 6 demonstrated using mustard seeds to show how land guide's a river's direction.

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Application Question

Medium difficulty • Concept in a practical situation

Medium

Question 8

Applied Concept

Why is it important for cities to have 'soak pits' near roads and buildings?

Soak pits help catch the rainwater that would otherwise just flow away on the cemented roads.
They provide a direct path for that water to enter the soil and recharge our underground water.
The text notes that in cities with many cemented surfaces, soak pits are a key way to help rainwater return underground.

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Application Question

Easy difficulty • Concept in a practical situation

Easy

Question 9

Applied Concept

If you spill a little water on a hot pavement during a summer afternoon, it disappears in a few minutes. Where does the water go?

The heat from the Sun and the hot pavement turns the liquid water into invisible water vapour.
This process is called evaporation, where water changes its form and rises into the air.
This is exactly how the Sun's heat causes water from oceans and rivers to become part of the water cycle.

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Application Question

Hard difficulty • Concept in a practical situation

Hard

Question 10

Applied Concept

Why would a Fishing Cat have a harder time surviving in a dry desert compared to a wetland?

The Fishing Cat has partially webbed paws specifically designed for swimming and diving.
It needs wetlands to find fish, which is its main food, and a desert has almost no water.
The text explains that aquatic features like webbed paws help animals survive in their specific water-based homes.

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Chapter sections

Chapter 1: Water—The Essence of Life | Application Questions

Imagine you are in a boat in the middle of the ocean and you are very thirsty. Can you drink the ocean water? Why or why not?

If you leave a cold bottle of water on your desk on a hot day, you will soon see tiny water droplets on the outside of the bottle. Where did this water come from?

Your neighborhood is replacing all the grassy parks with concrete parking lots. How will this change affect the water under the ground?

If a farmer in Rajasthan builds a Johad on his land, how does it help him during the dry summer months?

You see a lotus leaf in a pond and notice that it is not rotting or getting soggy even though it lives in water. Why is this?

If all the small fish in a river suddenly disappeared, what would happen to the birds like the Pond Heron that live there?

A river is flowing through a hilly area. Suddenly, it encounters a very large, hard rock in its path. What do you think the water will do?

Why is it important for cities to have 'soak pits' near roads and buildings?

If you spill a little water on a hot pavement during a summer afternoon, it disappears in a few minutes. Where does the water go?

Why would a Fishing Cat have a harder time surviving in a dry desert compared to a wetland?

Unlock all Application Questions