CBSE Class 4 Environmental Studies Question Paper Set 08 with Solutions

Answer: (d) All of these. Animal waste, vegetable peel and waste food are all natural things that germs break down into soil.

Teacher's Note:
1. Biodegradable waste comes from plants and animals and rots away by itself.
2. Plastic, glass and metal are not biodegradable, so do not mix them up.

Answer: (c) Transpiration. Plants give out water vapour through tiny holes in their leaves.

Teacher's Note:
1. Trans means across, so water passes from the plant to the air.
2. Evaporation is from water bodies and wet things, not from plants.

Answer: (a) Lion. A lion lives on land, while seahorses, crabs and fish live in water.

Teacher's Note:
1. Aquatic means living in water.
2. Read the word not in the question carefully before choosing.

Answer: (c) Elephant. It is big and strong and can walk through thick forest carrying people.

Teacher's Note:
1. Think of an animal that is strong and can walk on soft, rough ground.
2. Camels are used in deserts, not in jungles.

Answer: False. Clouds burst and give rain when they become too heavy with water drops.

Teacher's Note:
1. Water drops join and grow bigger and heavier inside a cloud.
2. Change the word light to heavy to correct the sentence.

Answer: False. Safe drinking water is called clean or potable water. Polluted water is dirty and unsafe.

Teacher's Note:
1. Polluted means made dirty.
2. Always check the key word in the sentence.

Answer: True. A lid keeps flies and rats away and stops the smell from spreading.

Teacher's Note:
1. Covering waste keeps our surroundings clean.
2. Wash your hands after throwing waste.

Answer: True. The yak has thick hair and lives in the cold, high mountains of the Himalayas.

Teacher's Note:
1. Animals live where their body suits the weather.
2. Link each animal to the place where it lives.

Answer: Clay (or red clay). It is sticky when wet and becomes hard when baked.

Teacher's Note:
1. Bricks are shaped from wet soil and baked in a kiln.
2. Do not write sand, as it does not stick together.

Answer: Bus (train, metro and auto-rickshaw are also correct). Many people travel together in it.

Teacher's Note:
1. Public transport is used by many people at a time.
2. A private car belongs to one family, so it is not an answer.

Answer: Camel. It can walk on sand and live many days without water.

Teacher's Note:
1. Camels store fat in their humps for food.
2. Think of a desert animal that carries people and loads.

Answer: Waste (garbage). We throw it away because we do not need it.

Teacher's Note:
1. Waste can be sorted into wet and dry waste.
2. Some waste can be reused or recycled, so do not just throw everything.

Answer: Currency. In India it is the rupee, in notes and coins.

Teacher's Note:
1. Currency is the money a country uses.
2. Write the one word asked, not a long sentence.

Answer: Condensation. Water vapour cools and turns into tiny drops of water.

Teacher's Note:
1. Condensation is the opposite of evaporation.
2. Clouds form because of condensation.

Answer: 1. Evaporation is the change of water into water vapour.
2. It happens when water is heated, for example by the Sun.

Teacher's Note:
1. Say that liquid water changes into gas.
2. Give one example, such as wet clothes drying.

Answer: 1. Draught animals are animals used to pull heavy loads or carts.
2. Examples are bullocks, horses, donkeys and camels.

Teacher's Note:
1. Draught means pulling loads.
2. Give one or two examples to get full marks.

Answer: 1. Biodegradable waste is waste that rots and breaks down naturally by the action of germs.
2. Examples are vegetable peel, leftover food and dry leaves.

Teacher's Note:
1. Bio means living and degrade means break down.
2. Do not give plastic as an example.

Answer: 1. Compost is a natural manure made when biodegradable waste rots over time.
2. It is added to soil to make it rich for plants.

Teacher's Note:
1. Compost helps us reuse kitchen and garden waste.
2. It is used instead of chemical fertilisers.

Answer: 1. Poly bags do not rot, so they stay in soil for years and make it unfit for plants.
2. Animals eat them and fall ill, and they choke drains and cause flooding.

Teacher's Note:
1. Give two clear reasons for two marks.
2. Suggest cloth or jute bags instead.

Answer: Butter and ghee (cheese and cream are also correct).

Teacher's Note:
1. Dairy products are made from milk.
2. Fats give us energy but we should eat them in small amounts.

Answer: 1. Heat or high temperature.
2. Wind or moving air.
3. Large open surface area.
4. Dry air (low humidity).

Teacher's Note:
1. Think of how clothes dry fastest.
2. Write the factors in a short list.

Answer: 1. Recycling turns old things into new ones, so less waste goes to landfills.
2. It saves natural resources, energy and reduces pollution.

Teacher's Note:
1. Recycling is one of the 3 R's.
2. Link your answer to saving nature.

Answer: 1. Animal-powered transport uses animals to carry people or goods.
2. Examples are bullock cart, horse cart (tonga), camel cart and elephant rides.

Teacher's Note:
1. Say what animals do for us.
2. Name at least one example.

Answer: 1. A balanced diet has all nutrients (carbohydrates, proteins, fats, vitamins, minerals) and water in the right amounts.
2. It gives energy, helps us grow and keeps our body strong.
3. It protects us from diseases.

Teacher's Note:
1. Mention nutrients and their uses.
2. Name examples such as roti, dal, vegetables, fruits and milk.

Answer: 1. Reduce: use fewer things and make less waste.
2. Reuse: use the same thing again, for example an old bottle or bag.
3. Recycle: make new things from old, used things like paper, glass and metal.

Teacher's Note:
1. Write the three words in the correct order.
2. Give an example for each R.

Answer: 1. Rain-fed rivers get water only from rain. They have water mainly in the rainy season and may dry up in summer. Example: Godavari.
2. Snow-fed rivers get water from melting snow of mountains and also from rain. They have water throughout the year. Example: Ganga.

Teacher's Note:
1. Compare both on source of water and on flow through the year.
2. Examples make the answer complete.

Answer: 1. Population is increasing, so more people need water for drinking and daily use.
2. Farms and industries use more water.
3. Wasting water and pollution of rivers and ponds reduce the clean water available.

Teacher's Note:
1. Give three separate reasons for three marks.
2. Fresh water is a small part of all water on Earth.

Answer: 1. Evaporation: wet clothes dry in the Sun; puddles dry up after rain.
2. Condensation: water drops form outside a glass of cold water; mirror gets fogged by hot breath or steam in a bathroom.

Teacher's Note:
1. Give two examples for each to get four marks.
2. In evaporation water becomes vapour and in condensation vapour becomes water.

Answer: 1. Do not throw garbage, plastic or waste into rivers, ponds and lakes.
2. Do not let dirty water from factories and drains flow into water bodies without cleaning it.
3. Do not wash clothes or animals in drinking water sources.
4. Use less chemicals and fertilisers, and tell others to keep water clean.

Teacher's Note:
1. Write the steps as clear points.
2. Link each step to what we can do ourselves.

Answer: 1. Public transport is used by many people together, runs on fixed routes and charges a fare. Examples: bus, train, metro.
2. Private transport belongs to a person or family and is used as and when they like. Examples: car, bicycle, scooter.
3. Public transport saves fuel and reduces traffic and pollution; private transport is more comfortable but costs more.
4. Public transport has a fixed timetable, private transport does not.

Teacher's Note:
1. Compare in the same points for both types.
2. Give two examples of each.