Are We Endangering Our Environment ? – Chapter 24 | Class 4 – Science Solutions | EVS – I
(A) What’s the solution?
Q. Your uncle who lives in Buldhana has an old scooter. It gives out a lot of smoke when it is started.
Answer :
- If your uncle’s old scooter in Buldhana gives out a lot of smoke, it means the scooter might need servicing.
- He should take it to a mechanic to check the engine and clean it. Sometimes, old scooters need new parts to work properly.
- Using good quality fuel can also help reduce the smoke.
- Fixing the scooter will make it run better and keep the air cleaner for everyone.
(B) Make a list
Q. Make a list of vehicles that run on petrol or diesel.
Answer : Here is a list of vehicles that run on petrol or diesel:
- Cars
- Motorcycles
- Trucks
- Buses
- Vans
- Tractors
- Scooters

(C) Think and tell.
Q.1.: Waste water from a factory is let into a river. What harmful effects does it have on the people in the neighbourhood?
Answer :
- When waste water from a factory goes into a river, it can make the water dirty and unsafe to use.
- People in the neighbourhood might get sick if they drink or touch this polluted water.
- It can also harm plants and animals living in the river.
- The bad smell and dirty water can affect the air and environment around the river too.
Q.2.: How did the discovery of electricity make human life more comfortable?
Answer :
- The discovery of electricity made life more comfortable in many ways.
- It brought lights into homes, so people could work and play even after dark. Electricity powers appliances like refrigerators to keep food fresh and TVs for entertainment.
- It helps us stay warm with heaters and cool with fans and air conditioners.
- Electricity also runs computers and phones, making communication and learning easier.
- Overall, electricity has made our lives more convenient and connected.
(D) Answer the following questions.
Q.1: Which are the different vehicles that man has invented?
Answer : Humans have invented various types of vehicles, including cars, motorcycles, trucks, buses, bicycles, airplanes, boats, trains, and even spacecraft.
Q.2: What has to be done to set up new colonies?
Answer : To set up new colonies, several things need to be done.
- First, an area of land needs to be chosen and prepared for building houses and roads.
- Basic amenities like water supply, electricity, and sewage systems must be planned and installed.
- Authorities also need to ensure that schools, hospitals, and shops are available for the people moving into the new colony.
- Proper planning and permissions from the government are necessary to make sure everything is safe and organized.
Q.3: Which diseases do mosquitoes spread?
Answer : Mosquitoes spread diseases like malaria, dengue fever, virus, and yellow fever. These diseases are caused by tiny germs that mosquitoes carry when they bite people.
Q.4: How has taking more than one crop in a year affected groundwater?
Answer : Taking more than one crop in a year, known as multiple cropping, can affect groundwater in two main ways.
- First, it increases the demand for water because more crops need to be irrigated, which can lower the water level in the ground.
- Second, using fertilizers and pesticides on multiple crops can pollute groundwater, making it unsafe for drinking and farming.
- Proper water management and conservation techniques are important to protect groundwater for future use.
(E) Fill in the blanks.
1. In summer, there is a …….. of water in many villages and cities.
2. A bullock or a male buffalo is used to turn the ……………….
3. ……………… is more intelligent than all other animals.
4. A mot is a large leather. ………………………………
5. People leave their villages for the cities in search of ………………
Answer :
1. shortage
2. rahat
3. man
4. bag.
5. work
(F) Find out.
Obtain information about the following: Write down the information you obtain and share it with your classmates.
Q.1: Using diesel and petrol sparingly
- Using diesel and petrol sparingly means using less fuel to save money and help the environment.
- When we use less fuel, we can keep the air cleaner and reduce pollution.
- It also helps because diesel and petrol come from oil, which is a limited resource.
- By using less, we make sure there’s enough for the future.
- We can do this by walking, biking, or using public transport more often instead of always driving cars.
Q.2: Saving water
- Saving water is important because it helps make sure we have enough for everyone.
- We can save water by turning off the tap when brushing our teeth and taking shorter showers.
- Using a bucket to water plants instead of a hose also helps save water.
- Fixing any leaks in taps and pipes is another good way to avoid wasting water.
- Saving water helps keep our environment healthy and makes sure we have enough for our needs.
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हिंदी निबंध
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