DAV Class 4 SST Solution Chapter 6 Waste materials
DAV School Books Class 4 SST Solution Chapter 6 Waste materials all Question Answer. DAV Class 4 6th Chapter Waste materials full Chapter explanation by expert teacher.
DAV School Books Class 4 SST Solution Chapter 6 Waste materials:
(A) Tick (✓) the correct option.
(1) Animal and plant waste can be converted into ——–.
(a) Biogas
(b) LPG
(c) Natural gas
Answer: (a) Biogas.
(2) It is the duty of ——– to keep our surroundings clean and green.
(a) The Government
(b) Citizens
(c) Both
Answer: (c) Both.
(3) It is easy to recycle ———.
(a) Plastic
(b) Fruits and vegetable peels
(c) Both
Answer: (b) Fruits and vegetables peels.
(4) Construction waste can be used
(a) Filling ditches
(b) Building walls
(c) Making pots
Answer: (a) Filling ditches.
(B) Fill in the blanks:
Help Box: (environment, soil, compost, clean rethink)
(1) Human waste in open fields must be covered with ——– in rural areas.
Answer: soil.
(2) Recycling is beneficial for the……………
Answer: environment.
(3) Biodegradable waste can be used to make…………….
Answer: compost.
(4) Waste disposal is important to keep our surroundings ——–.
Answer: clean.
(5) The four Rs to reduce waste are reduce, reuse, recycle and ———.
Answer: rethink.
(C) Match the following.
Answer:-
(1) Biodegradable :- (b) can be converted into harmless substances.
(2) Non-biodegradable waste :- (a) cannot be easily converted to harmless substances.
(3) All living beings :- (d) produce waste.
(4) Recycling will benefit :- (c) animals & humans both.
(D) Answer the following questions:
(1) What is waste? Name three diseases caused by waste materials thrown in open areas.
Answer: The substance which is discarded after use and which is non-usable and non recyclable is known as Waste. Diseases caused by waste are dysentery, chlorella, typhoid, malaria.
(2) Highlight two differences between biodegradable and non-biodegradable waste.
Answer:-
(1) Biodegradable wastes – Biodegradable wastes are dry leaves, vegetable and fruit peels, egg shells, papers and leftover food items. They can be converted into harmless substances by dumping them in a pit.
(2) Non-biodegradable wastes – wastes are nails, polythene bags, aluminium foil, pins, glass, rubber, plastic pieces, chemicals and construction waste from buildings, bridges, roads, etc. Non-biodegradable waste cannot be converted into harmlesssubstances. But most of it is recyclable.
(3) What are the benefits of recycling?
Answer: The benefits of recycling are as follows –
- It reduces the amount of waste.
- It conserves our natural resources like timber, water, iron, etc.
- It reduces pollution.
- It saves energy.
(4) Mention any two methods of waste disposal. Which one is the best in your opinion? Give one reason.
Answer: The methods of waste disposal are as follows –
(1) Recycling of waste.
(2) Landfill of waste.
The best method of waste disposal is recycling the waste material because by recycling the waste we can reuse the things and reduce the amount of waste.
(5) Suggest two ways of reusing waste materials from our homes, school and offices.
Answer: Ways of reusing waste material from our house, school & college are –
(1) Reuse the newspaper and cardboard.
(2) Don’t throw away the old books, give it to the needed child.
(3) In offices reduce the use of paper.
(4) Reuse a tin container for decorative purposes.
(E) Complete the waste management puzzle with the help of clues given.
Clues
Across
(1) To use something again.
Answer: RECYCLE.
(3) To give away something to someone.
Answer: DONATE.
(4) Something useless.
Answer: TRASH.
Down
(2) Converting a useless article into a useful one.
Answer: REUSE.
(5) A bag can be used again.
Answer: CLOTH.
(6) A ——– bucket can be recycled.
Answer: PLASTIC.
Something to do
(1) List down any four items thrown away as garbage in your house everyday.
Answer: Waste thrown away everyday from my house is – Plastic bags, tin containers, paper, packaging materials, food items.
(2) Can you reduce the waste that your family creates everyday? How?
Answer: Yes, we can reduce the waste from the house. the ways are as follows –
- Reuse the newspaper plastic containers and tin containers for decorative purposes.
- Use close bags instead of plastic bags.
- Use metal bottles instead of plastic bottles.
(3) Do you sell any waste material to kabadiwala (trash dealer)? Find out. Find out how much he pay for………
(a) One kilogram newspaper.
Answer: 10 rupees.
(b) One kilogram plastic goods.
Answer: 20 rupees.
(5) Where do you throw your household garbage? Do you reuse waste materials? How? Who takes away the garbage from your home? Where does he/she throw it?
Answer: We are not throwing garbage anywhere because the rag pickers are regularly coming to take the garbage from houses. Yes, we reuse the waste material. Ragpickers are taken away from the house. They divide the waste according to their types.
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