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

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

Long Answer

Medium difficulty • Structured explanation

Medium

Question 1

Long Form

Explain the concept of the Water Cycle and how it functions in nature.

The water cycle is the constant circular movement of water between the Earth and the sky.
It starts when the Sun's heat turns liquid water from oceans and rivers into water vapour.
This vapour rises, cools down, and forms clouds made of tiny water droplets.
When clouds get heavy, water falls back down as rain, snow, or hail to the Earth.
A detailed example is how rain falling on a forest flows into a stream, then a river, and finally back to the ocean to start the journey again.

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Long Answer

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Question 2

Long Form

Describe why freshwater is considered a limited and precious resource on Earth.

Most of the Earth's surface is covered with water, but the majority of it is salty ocean water.
Salty water cannot be used by humans for drinking or by farmers for growing crops.
All living beings like plants, animals, and birds strictly depend on freshwater to survive.
The actual amount of available freshwater is very small compared to all the water on the planet.
The chapter gives the example that if all Earth's water was in a glass, the freshwater would only be one tiny teaspoon.

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Long Answer

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Medium

Question 3

Long Form

How does human activity in cities affect the recharge of groundwater?

Groundwater is created when rainwater is soaked up by the soil and sinks deep into the earth.
In cities, we cover the ground with cemented roads, concrete buildings, and paved areas.
These hard surfaces act like a shield and stop the rainwater from entering the soil.
When water cannot sink into the ground, our underground water stores do not get refilled or recharged.
An example from the text is that open green lawns allow water to seep in, while concrete roads cause water to just flow away.

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Long Answer

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Hard

Question 4

Long Form

Discuss the different ways in which we can help rainwater return underground.

We can create open, uncovered areas in our schools and homes so water can seep into the soil.
Planting more trees is a great way to help because roots and soil hold onto rainwater.
Building soak pits or small ponds helps catch rainwater and gives it time to sink down.
Traditional methods like making earthen dams or Johads can store water for local groundwater recharge.
In the text, the example of Hiware Bazar shows how a community saved its water by managing their local land and harvesting rain.

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Long Answer

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Medium

Question 5

Long Form

Explain how the shape of the land affects the flow and movement of river water.

Water always flows from a higher point to a lower point because of the land's slope.
Rivers usually start in high mountains and follow the natural path carved into the earth.
The path of a river can stop, curve, or change direction based on land formations like hills.
As water flows, it also has the power to slowly change and carve the shape of the land itself.
A detailed example is Activity 6, where mustard seeds poured on crumpled paper moved along the folds just like rivers flow through valleys.

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Long Answer

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Medium

Question 6

Long Form

Describe the variety of plants found in freshwater habitats and their special features.

Freshwater habitats like ponds and rivers support many types of plants with unique features.
Edge plants like Reeds grow tall and grass-like right along the banks of the water.
Rooted floating plants, like the Lotus, have roots in the bed but flowers that stay on top.
Free-floating plants like the Water Hyacinth have no fixed spot and spread across the surface.
A key example is the waxy coating on leaves that acts like a raincoat to keep them from getting damaged by too much water.

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Long Answer

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Hard

Question 7

Long Form

How do animals living in water adapt to their environment compared to land animals?

Water animals have bodies designed to move and breathe easily in their liquid home.
Fish use fins for swimming and have special mouths to feed while moving through water.
Some creatures, like the Water Scorpion, use breathing tubes to get air from the surface.
Land animals, however, cannot breathe underwater and use legs instead of fins to move.
The text uses the example of the Pond Heron, which has very long, thin legs to stand still in water and catch fish.

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Question 8

Long Form

Detail the role of rivers in the lives of people and the surrounding culture.

Rivers are not just physical water bodies; they are deeply connected to our communities.
People rely on rivers for daily needs like drinking water, washing, and growing crops.
Many festivals and stories in India are built around memories and respect for our rivers.
Rivers support entire ecosystems of plants and animals that humans rely on for food.
An example is how students are encouraged to ask grandparents about stories and memories connected to local rivers to see their cultural value.

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Long Answer

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Easy

Question 9

Long Form

Explain how water can change its form through heating and cooling.

Water is unique because it can exist as a solid, a liquid, or a gas depending on temperature.
When water is cooled significantly, it turns into solid ice, which is seen in glaciers.
If ice is left out in the heat, it melts and returns to its liquid form as water.
Heating liquid water makes it turn into vapour or steam, which rises into the air.
A simple example is Activity 2, where ice cubes in a steel glass melt and form water droplets on the outside of the glass.

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Long Answer

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Easy

Question 10

Long Form

What are the various sources of freshwater mentioned in the chapter?

Surface water bodies like rivers, ponds, and lakes are major sources of fresh water.
Rainwater is a natural source that falls from the sky and fills our water bodies.
Groundwater is found deep under the earth and can be accessed through wells.
Frozen water in the form of ice caps and glaciers also holds huge amounts of freshwater.
The text highlights Wular Lake in Jammu and Kashmir as a very large and important freshwater source in Asia.

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Chapter sections

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

Explain the concept of the Water Cycle and how it functions in nature.

Describe why freshwater is considered a limited and precious resource on Earth.

How does human activity in cities affect the recharge of groundwater?

Discuss the different ways in which we can help rainwater return underground.

Explain how the shape of the land affects the flow and movement of river water.

Describe the variety of plants found in freshwater habitats and their special features.

How do animals living in water adapt to their environment compared to land animals?

Detail the role of rivers in the lives of people and the surrounding culture.

Explain how water can change its form through heating and cooling.

What are the various sources of freshwater mentioned in the chapter?

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