4th Science : Term 3 Unit 1 : Green Environment
Evaluation
I. Choose the correct answer.
1. What is the first step in waste management?
Answer: (b) Waste separation
2. Which is an example for non-biodegradable waste?
Answer: (b) Plastic plate
3. _______ attracts more litter so it is important to always put waste in a bin.
Answer: (c) Litter
4. ____________ is the first ‘R‛ in the Three R‛s.
Answer: (b) Reduce
5. Picking up the waste is called __________.
Answer: (b) Waste collection
II. Fill in the blanks.
1. Using old jars for pickle is an example of reusing waste.
2. Bamboo is used to make bags, dustbins and tooth brushes.
3. Plastic is a big threat to our environment.
4. Multilayer plastic is a non-recyclable item.
III. Match the following.
Attempt to match the items in Column A with Column B before checking the answer below.
| Column A | Column B |
|---|---|
| 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 |
Answer Key:
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
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
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
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.
Activity
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
2. Waste collection and transportation
3. Waste recycling and composting
4. Waste disposal
Activity
List out four things that you can reduce, reuse and recycle at home or school.
Activity
Using old water bottles, make different things such as Bird feeder, Flower vase, Pen holder and Wall hanging as shown below.
Activity
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
2. Recyclable: Paper, plastics, glass, metal
3. Non-recyclable: Medical waste, CFL lights, Plastic bags, Polystyrene
Activity
Form small groups and start collecting plastic litter from school grounds or from the local area around your house.
Activity
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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