Chapter 2: Journey of a River Case Study Questions | Environmental Science - EVS Class 5 CBSE

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Case Set 1

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Rohan is looking at a map of India for his school project. He sees a blue line that starts at a place called Trimbakeshwar in the Western Ghats of Maharashtra. This line travels a very long distance of 1,465 kilometres across the land before reaching the Bay of Bengal. Rohan learns that this river is very special and is often called the Dakshina Ganga by people in the south.

Question 1: Which river is Rohan looking at on the map?

He is looking at the river Godavari
It is the second longest river in India

Question 2: What happens to this river as it moves across the land?

Rainwater and other streams join it along the way
These small streams called tributaries make it wider and stronger

Question 3: Why is this river given a special name like Dakshina Ganga?

It flows through the southern part of India
People consider it to be as sacred as the river Ganga
It is mentioned in old stories like the Ramayana and Puranas

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Case Set 2

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Meena visits her uncle's farm near a river. She notices that the water is covered by a thick green layer that looks like a blanket. Her uncle explains that he uses fertilizers to help his crops grow, but some of it washes into the river when it rains. Meena sees that the fish in the river are struggling to breathe because of this green layer.

Question 1: What is the 'green blanket' mentioned in the story?

It is a layer of fast growing plants and organisms
This happens when fertilizers from farms enter the water

Question 2: Why is this green blanket dangerous for the fish?

The thick layer starts choking the life inside the river
It makes it very hard for the fish to breathe properly

Question 3: How does the fertilizer reach the river from the farm?

Farmers use fertilizers to help their crops grow better
During rain the fertilizers get washed down from the land
The runoff water carries these chemicals straight into the river

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Case Set 3

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A class goes on a field trip to see a giant wall built across a river. The teacher explains that this wall is a dam. It blocks the river's flow and creates a huge lake of water. The teacher says that while this helps people during dry seasons to grow crops and make electricity, it also changed the lives of many people and animals who lived there before.

Question 1: What is the large water body behind a dam called?

It is called a reservoir
It stores water so people can use it later

Question 2: List two ways this stored water helps people.

It provides water to drink and grow crops during dry seasons
The force of the water is used to make electricity

Question 3: What happens to the people and animals when a dam is built?

The dam floods land that was once their home
Many people have to leave their houses and shift elsewhere
Animals lose their forest habitats under the rising water

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Case Set 4

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Sameer lives in a village where it has been raining heavily for three days. The local news reports that the river is expanding and becoming faster and deeper. Sameer's parents are worried that the river might overflow its banks. They start preparing an emergency bag with food, medicines, and a flashlight. They want to be ready to leave for higher ground if the flooding starts.

Question 1: Why does a river overflow its banks?

It happens when there is too much rain in a short time
The river expands and becomes bigger than it can handle

Question 2: What are two things Sameer's family should put in their emergency bag?

They should pack food and necessary medicines
A flashlight is important to see in the dark

Question 3: What can happen to a village when a river floods?

Water can flood houses and damage roads
Crops in the fields can be destroyed by the water
Diseases can spread because of the dirty flood water

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Case Set 5

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Anu goes on a boat ride in the Coringa Mangrove Forests. She sees that the river is spreading out into many small streams. The guide tells her that this is a delta where the river's freshwater meets the salty sea. Anu spots turtles, flamingos, and crocodiles. She realizes that the river's journey is coming to an end here as it joins the big ocean.

Question 1: What is a delta in a river's journey?

It is where a river spreads into small streams at the sea
This is the place where the river's journey ends

Question 2: Which two types of water meet at the Coringa Mangrove Forests?

The freshwater from the river Godavari
The salty water from the Bay of Bengal

Question 3: Name three animals Anu might see in this mangrove area.

She can see turtles swimming in the water
Large crocodiles live in the muddy areas
Colorful birds like flamingos can be seen nearby

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Chapter sections

Chapter 2: Journey of a River | Case Study Questions

Passage

Question 1: Which river is Rohan looking at on the map?

Question 2: What happens to this river as it moves across the land?

Question 3: Why is this river given a special name like Dakshina Ganga?

Passage

Question 1: What is the 'green blanket' mentioned in the story?

Question 2: Why is this green blanket dangerous for the fish?

Question 3: How does the fertilizer reach the river from the farm?

Passage

Question 1: What is the large water body behind a dam called?

Question 2: List two ways this stored water helps people.

Question 3: What happens to the people and animals when a dam is built?

Passage

Question 1: Why does a river overflow its banks?

Question 2: What are two things Sameer's family should put in their emergency bag?

Question 3: What can happen to a village when a river floods?

Passage

Question 1: What is a delta in a river's journey?

Question 2: Which two types of water meet at the Coringa Mangrove Forests?

Question 3: Name three animals Anu might see in this mangrove area.

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