Text Book Back Questions and Answers - Chapter 1 Green Environment Term 3 4th Science Guide Samacheer Kalvi Solutions - SaraNextGen [2024-2025]

Updated On May 15, 2024

By SaraNextGen

Chapter 1 - Green Environment - Term 3 - 4th Science Guide Samacheer Kalvi Solutions

Text Book Back Questions and Answers
I. Choose the correct answer :
Question $1 .$
What is the first step in waste management?
(a) Waste disposal
(b) Waste separation
(c) Waste collection
Answer:
(b) Waste separation

Question $2 .$
Which is an example for non-biodegradable waste?
(a) Paper cup
(b) Plastic cup
(c) Coconut shell
Answer:
(b) Plastic cup

Question $3 .$
Picking up the waste is called
(a) Waste collection
(b) The environment
(c) Litter
Answer:
(a) Waste collection

Question $4 .$

______is the first ' $R$ ' in the Three $R$ 's.
(a) Reuse
(b) Reduce
(c) Recycle
Answer:
(b) Reduce

II. Fill in the blanks:

Question $1 .$
______is an example of reusing waste. (Using old jars for pickle / Saying not to a plastic bag)
Answer:
Using old jars for pickle

Question $2 .$
______is used to make bags, dustbins and tooth brushes. (Rose / Bamboo)
Answer:
Bamboo

Question $3 .$
______is a big threat to our environment. (Plastic pollution / Light pollution)
Answer:
Plastic pollution

Question $4 .$

______is a non-recyclable item. (Glass / Multilayer plastics)
Answer:
Multilayer-plastics

III. Match the following : 
Question 1. 

Answer:

IV. Write True or False:
Question $1 .$
$3 R$ method reduces the amount of waste that goes to landfills.
Answer:
True

Question $2 .$
Eco-friendly material is harmful to the environment.
Answer:
False

Question $3 .$
Plastic bag, thermocol and multilayer plastics are recyclable.
Answer:
False

Question $4 .$
We should not separate our waste.
Answer:
False

V. Answer in one or two sentences:
Question $1 .$
What are the Three R's?
Answer:
The three R's stand for REDUCE, REUSE, RECYCLE.

Question $2 .$
What is bio-degradable waste?
Answer:
Bio-degradable waste is a form of waste, originating naturally from plant or animal sources, which may be degraded by other living organisms.

Question $3 .$
Write the different steps in waste management.
Answer:
- Separation of waste
- Waste collection and transportation
- Waste recycling and composting
- Waste disposal

Question $4 .$
Name five items which are recyclable.
Answer:
Paper, glass, metal, cardboard and plastic covers.

VI. Answer the following :
Question $1 .$
How will you manage the household waste?
- Divide the waste into different waste bins.
- Each bin should have different type of wastes.
- Green for biodegradable waste, Blue for recyclable waste and Red for nonrecyclable waste.

Question $2 .$
What are the plastic items that have been banned in Tamil Nadu?
Answer:
Plastic bags, plastic plates, water pouches, plastic straws, plastic sheets.

Question $3 .$
Write the benefits of recycling.
Answer:
- Old newspapers, note books and magazines are sold to a scrap dealer. They will be made into new paper.
- PET bottles are recycled into plastic threads and used to make sports T-shirts.
- Old glass bottles and broken glass pieces are melted to make new glass.
- Broken metal items like tiffin boxes and plates are melted and made into new metal products like toys.

Question $4 .$
What is known as eco-friendly material?
Answer:
Materials which are beneficial to the environment and do not cause harm are called eco-friendly materials

In Text Questions and Answers
Activity (Text Book Page No. 65)

Question $1 .$
Write the waste management process in the correct order.
(Waste disposal, Waste collection and transportation, Waste separation, Waste recycling and composting)
Answer:
1. Waste separation
2. Waste collection \& transportation
3. Waste recycling A composting
4. Taste disposal

Activity (Text Book Page No. 67)
Question $1 .$
List out four things that you can reduce, reuse and recycle at home or school.

Answer:

Activity (Text Book Page No. 70)
Study the images below and write down three items you have at home in each category of waste.
Question $1 .$

Answer:

Biodegradable: Vegetable peels, fruit peels, mat.

Question $2 .$

Answer:

Recyclable: Glass, metal, paper & cardboards 

Question $3 .$

Answer:

Non-recyclable : Plastic baas, CFL lights, mixed electronic wastes.

Activity (Text Book Page No. 74)
Question $1 .$
Write any five non-recyclable items that you use or*have seen in shop.
Answer:
CFL lights, plastic bags, mixed electronic wastes, medical wastes, polyester.

Additional Questions and Answers
I. Choose the correct answers:
Question $1 .$
Unwanted materials pollute our ______
(a) Land
(b) Air
(c) Both a and b
Answer:
(c) Both a and b

Question $2 .$
______is the very important step in waste management.
(a) Separation of waste
(b) Waste disposal
(c) Waste collection
Answer:
(a) Separation of waste

Question $3 .$
______is to take materials from things you throw away and make new products with them.
(a) Reduce
(b) Reuse
(c) Recycle
Answer:
(c) Recycle

Question $4 .$

______can return back to the soil and become food for plants.
(a) Biodegradable
(b) Non-degradable
(c) Recyclable
(d) None
Answer:
(a) Biodegradable

Question $5 .$
_______is an example for eco-friendly material.
(a) Leaf plate
(b) Plastic plate
(c) Thermocol plate
Answer:
(a) Leaf plate

II. Fill in the blanks :
Question $1 .$
Picking up the waste is called ______(waste disposal / waste collection)
Answer:
waste collection

Question $2 .$
_______waste can be turned into something new which is valuable. (Recyclable /Non - recyclable)
Answer:
Recyclable

Question $3 .$
_______is using something repeated for the same or for another purpose. (Reuse / Reduce)
Answer:
Reuse

Question $4 .$
______of our environment means to protect all things found in nature. (Observation / Conservation)
Answer:
Conservation

Question $5 .$
Plastic bags and food packaging is a ______ item. (non-recyclable / recyclable)
Answer:
Non-recyclable

III. True or false :
Question $1 .$
It is best to separate waste into 3 different bins.
Answer:
True

Question $2 .$
Reuse is to make or use less
Answer:
False

Question $3 .$
Broken glass pieces are melted to make new glass.
Answer:
True

Question $4 .$
We should conserve our natural resources and energy
Answer:
True

IV. Answer the following :
Question $1 .$
What is separation of waste?
Answer:
It means to sort or divide the waste into different waste bins.

Question $2 .$
What is waste collection?
Answer:
Picking up the waste by our municipality or corporation is called waste collection.

Question $3 .$
What is transportation?
Answer:
Moving the waste from one place to another is called transportation.

Question $4 .$
What is compost?
Answer:

1. Compost is the decayed organic material which is obtained from the biodegradable waste.
2. Compost makes the soil fertile.

Question $5 .$
What is waste disposal or final disposal?
Answer:
The waste that cannot be recycled (non-recyclable waste) needs to be sent for final disposal.

Question $6 .$
What is Reduce?
Answer:
Reduce is to make or use less materials.

Question $7 .$
What is Reuse?
Answer:
Reuse is using a thing repeatedly for the same or for another purpose.

Question $8 .$
What is Recycle?
Answer:
Recycle is to take materials from things you throw away and make new products by using them.

Question $9 .$
Name some materials that you can at home recycle?
Answer:

- PET bottles
- Old glass bottles and broken glass pieces
- Broken metal items

V. Answer in detail :
Question $1 .$
Write down the eco-friendly activities.
Answer:
- Reduce your paper use by writing on both sides of every sheet.
- Stop using plastic straws.
- Use reusable bag.
- Give up chewing gum.
- Buy stainless steel bottles instead of plastic water bottles.
- Reuse containers for storing left overs.

Question $2 .$
What is meant by conservation of environment?
Answer:
- Conservation of environment means to protect all things found in nature.
- It means that we have to use our Earth's natural resources (like water, soil, minerals, wildife and forests) carefully.
- Everyone can conserve the environment by good waste management habits.