Class 4 EVS – Complete Answer Key
Section A – MCQs
- b) It does not get enough sunlight
- b) A small root and shoot appear
- b) Provide useful products such as milk
- b) Thick layer of fat in its hump and ability to survive with little water
- b) In a clean, covered container
- b) Reduce waste
- b) Plumber
- b) To allow rainwater to flow down easily
- c) Aeroplane
- a) The water and animals may be harmed
Section B – Very Short Answers
11.
Living things grow and need food, while non-living things do not grow or need food.
12.
Plants need sunlight:
- To make their food.
- To grow properly and stay healthy.
13.
Germination is the process by which a seed begins to grow into a new plant. Seeds need water, air and suitable warmth for germination.
14.
Animals are useful because:
- They provide milk, eggs and wool.
- Some animals help in farming and transportation.
15.
We should not disturb wild animals because they need their natural habitats for food, shelter and reproduction. Disturbing them can also make them stressed or endangered.
16.
Two protein-rich foods are eggs and pulses. Proteins help our body grow and repair tissues.
17.
Two ways to make drinking water safer are:
- Boiling the water.
- Filtering the water.
18.
People build different houses because of differences in climate, available materials, land and local needs.
19.
Public transport:
- Reduces traffic on roads.
- Helps reduce fuel use and air pollution.
20.
Biodegradable waste is waste that can to reach the leaves. The leaves use water along with sunlight and because chips, sweets and soft drinks contain too much sugar, salt and unhealthy fats. Healthier be broken down naturally by microorganisms. Example: vegetable peels.
Section C – Short Answers
21.
Roots absorb water from the soil. The water moves upward through the stem to reach the leaves. The leaves use water along with sunlight and carbon dioxide to make food.
22.
- The seed kept in moist soil germinated.
- It had enough water and air, along with suitable conditions.
- The experiment shows that water is necessary for seed germination.
23.
Domestic animals are animals that are kept and cared for by people, such as cows and goats. Wild animals live independently in their natural habitats, such as lions and elephants.
24.
No, this is not a healthy diet because chips, sweets and soft drinks contain too much sugar, salt and unhealthy fats. Healthier choices include fruits, vegetables, pulses, milk and eggs.
25.
Water is used for drinking, cooking, bathing, washing and growing plants. We should not waste it because all living things need water and usable fresh water is limited.
26.
Forests:
- Provide food and shelter for animals.
- Give us wood, fruits, medicines and other resources.
- Help maintain clean air and a balanced environment.
27.
Weather describes the condition of the atmosphere at a particular time, such as a rainy or sunny day. A season lasts for a longer period and has a usual pattern of weather, such as summer or winter.
28.
Three road safety rules are:
- Cross the road at a zebra crossing.
- Obey traffic lights and road signs.
- Look both ways before crossing and use the footpath where available.
Section D – Application and Reasoning
29.
Useful insects such as bees and butterflies help in pollination, which helps plants produce fruits and seeds.
Safer methods include:
- Removing harmful insects by hand where possible.
- Using natural or biological methods instead of harmful chemicals.
If all insects disappeared, many plants would not be pollinated, and food chains and ecosystems would be disturbed.
30.
Leaving taps and hoses running wastes a large amount of water.
The family can:
- Turn off the tap while brushing.
- Use a bucket instead of a hose for washing the car.
Saving water is important because fresh water is limited and is needed by people, animals and plants.
31.
Dirty pond water can cause water-borne diseases and harm fish, plants and other organisms.
Villagers should:
- Stop throwing garbage into the pond.
- Keep sewage and dirty water away from it.
Clean water helps reduce diseases and improves the health and quality of life of the villagers.
32.
Trees:
- Give oxygen and shade.
- Provide homes for birds and other animals.
Cutting too many trees can cause loss of habitats, more heat, soil erosion and air pollution.
The road could be widened by changing its design to save important trees wherever possible.
33.
Woollen clothes help keep us warm because wool traps air and reduces the loss of body heat.
People in hot regions need lighter clothes because their bodies need to lose heat more easily.
Examples of adaptation:
- People in cold areas wear woollen clothes and use heaters.
- People in hot areas wear loose cotton clothes and use fans.
34.
The school can:
- Use both sides of paper.
- Reuse one-sided paper for rough work.
- Collect paper separately for recycling.
- Use digital notices and assignments when suitable.
Section E – Long Answers
35. Plants and Our Lives
a) We get fruits, vegetables, wood, medicines and fibres from plants.
b) Plants help the environment by:
- Giving us oxygen and absorbing carbon dioxide.
- Preventing soil erosion and providing habitats for animals.
c) Children can protect plants by watering them, avoiding damage to them, planting new trees and not wasting paper.
36. Food and Health
a) A balanced diet contains different nutrients in the right amounts to keep us healthy.
b) Carbohydrates provide energy for our daily activities.
c) Proteins help the body grow and repair tissues.
d) Fruits and green vegetables are good sources of vitamins and minerals.
e) Children should avoid eating too much junk food, sweets and sugary drinks.
37. Water and Conservation
a) Water is used for:
- Drinking
- Cooking
- Bathing
- Washing
- Growing crops
b) Rainwater harvesting is the process of collecting and storing rainwater for later use.
c) It helps save water and provides an additional source of water mostly waste that can decompose naturally, while, especially during dry periods.
d) Families can save water by:
- Turning off taps when not needed.
- Repairing leaking taps and pipes.
38. Our Environment
a) Increasing garbage can cause bad smells, diseases, blocked drains, pollution and harm to animals.
b) Wet waste is mostly waste that can decompose naturally, while dry waste includes materials such as paper, plastic and metal.
c)
- Wet waste: vegetable peels, leftover food
- Dry waste: paper, plastic bottles
d) Waste segregation separates different types of waste so that organic waste can be composted and recyclable materials can be recycled.
Section F – Case Study / HOTS
39. A Visit to a Village
a) Ponds provide water for people, animals, farming and other activities.
b) Cattle can provide milk and manure and may also help with farming work.
c) Rainwater collection provides extra water and helps people save water for times when rainfall is low.
d) One occupation connected with farming is farmer/agriculture worker.
e) Village houses may be different because of local climate, available materials and space.
f) Students can help by not littering, using dustbins and spreading awareness about cleanliness.
40. Making the School Greener
a) Trees provide shade, oxygen, cooler surroundings and homes for birds and insects.
b) Students can:
- Carry reusable water bottles and lunch boxes.
- Avoid unnecessary plastic bags and disposable items.
c) Saving electricity reduces energy use and environmental pollution.
d) The school can collect rainwater from rooftops through pipes into tanks or recharge pits and use it for gardening and other suitable purposes.
e) Students can conduct a poster-making campaign, cleanliness drive or awareness rally.
f) I would start by reducing plastic use, because students can easily make this change every day and encourage others to do the same.