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Chapter: 4th Science : Term 3 Unit 1 : Green Environment

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4th Science : Term 3 Unit 1 : Green Environment : Text Book Back Exercises Questions with Answers, Solution, Evaluation; Choose the correct answer, Fill in the blanks, Say True or False, Match the following, Short Answers, Answer briefly, Answer in detail, Questions based on higher order thinking, Student Activities, Student Project

Green Environment (Term 3 Chapter 1 | 4th Science)



I. Choose the correct answer.


1. What is the first step in waste management?

(a) Waste disposal

(b) Waste separation

(c) Waste collection

Answer: (b) Waste separation


2. Which is an example for non-biodegradable waste?

(a) Paper cup

(b) Plastic plate

(c) Coconut shell

Answer: (b) Plastic plate


3. _______ attracts more litter so it is important to always put waste in a bin.

a. Waste collection

b. The environment

c. Litter

Answer: (C) Litter


4. ____________ is the first ‘R‛ in the Three R‛s.

(a) Reuse

(b) Reduce

(c) Recycle

Answer: (b) Reduce


5. Picking up the waste is called __________.

(a) Composting

(b) Waste collection

(c) Recycling

Answer: (b) Waste collection


II. Fill in the blanks.

1. Using old jars for pickle is an example of reusing waste.

(Using old jars for pickle/Saying no to a plastic bag)

2. Bamboo is used to make bags, dustbins and tooth brushes.

 (Rose / Bamboo)

3. Plastic is a big threat to our environment.

 (Plastic / Light)

4. Multilayer plastic is a non-recyclable item.

 (Glass / Multilayer plastic)


III. Match the following.

1. Plastic waste - Three R‛s

2. Waste separation - Eco-friendly material

3. Reduce, Reuse and Recycle - Threat to environment

4. Stainless steel - Biodegradable, recyclable and non-recyclable


1. Plastic waste - Threat to environment

2. Waste separation - Biodegradable, recyclable and non-recyclable

3. Reduce, Reuse and Recycle - Three R‛s

4. Stainless steel - Eco-friendly material


V. Write true or false.

1. 3R method reduces the amount of waste that goes to landfills. (True)

2. Eco-friendly material is harmful to the environment. (False)

3. Plastic bag, thermocol and multilayer plastics are recyclable. (False)

4. We should not separate our waste. (False)


VI. Answer in one or two sentences.

1. What are the Three R‛s?

The three R’s stand for REDUCE, REUSE, RECYCLE

2. What is biodegradable waste?

Things that can be decomposed or broken down by microorganisms are biodegradable wastes.

3. Write the different steps in waste management.

There are four steps in waste management. They are

1. Separation of waste

2. Waste collection and transportation

3. Waste recycling and composting

4. Waste disposal

4. Name any five items which are recyclable.

Paper, glass, metal, PET bottles, cardboard


VII. Answer the following.

1. What can you do at home to help waste management ? (or) How will you manage the household waste?

Waste at home should be separated into biodegradable, recyclable and non -recyclable categories. Biodegradable waste such as left-over food and vegetable waste can be broken down naturally to create compost. Recyclable waste such as paper, glass and metal can be made into new useful products. Non-recyclable waste should be kept separate and will be sent to an open dump or landfill. This should be reduced as much as possible.

2. What are the plastic items that have been banned in Tamil Nadu?

Tamil Nadu is leading the way in India by banning some one-time use plastic items.

List of items : Plastic carry bags, Plastic Plates, Water pouches, Plastic straw & Plastic sheets

3. Write the benefits of recycling.

Recycle is to take materials from things you throw away and make new products by using them. Recycling takes energy and time but saves the amount of 'new' resources (for example water, minerals, wood) we need to make things.

4. What is meant by eco-friendly material?

Things that can be decomposed or broken down by microorganisms are biodegradable. They can return back to the soil and become food for plants. These biodegradable items are environment friendly or eco-friendly materials.


Write the waste management process in the correct order.

(Waste disposal, Waste collection and transportation, Waste separation, Waste recycling and composting)

1. Waste separation

2. Waste collection and transportation

3. Waste recycling and composting

4. Waste disposal


List out four things that you can reduce, reuse and recycle at home or school.


Using old water bottles, make different things such as Bird feeder, Flower vase, Pen holder and Wall hanging as shown below.


Study the images below and write down three items you have at home in each category of waste.

Biodegradable | Recyclable items | Non-recyclable items

1. Biodegradable: Fruits, Vegetables, Seeds, Nuts

2. Recyclable: Paper, plastics, glass, metal

3. Non-recyclable: Medical waste, CFL lights, Plastic bags, Polystyrene


Form small groups and start collecting plastic litter from school grounds or from the local area around your house.


Write any five non-recyclable items that you use or have seen in shop.

Answer: 1 .Plastic carry bags 2. Straw 3. Plastic plates 4. Plastic sheets 5. Water pouches

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