Q.1. (a) Name the two kinds of waste that need to be separated from each other in two different waste bins.
(b) Name two items of waste each that need to be sent to a (i) landfill (ii) for composting.
Q.2. 3R's are used as efficient means to reduce waste. What is meant by three R's in terms of waste disposal?
Q.3. Why should we not burn plastic items?
Q.4. List some differentiating features between composting and vermicomposting.
Q.5. Why should containers used for storing poisonous substances be recycled separately?
Q.6. Write any two ways to minimise the harmful effects of plastics.
Q.7. Write the definitions of following.
(a) Compost.
(b) Landfill.
(c) Recycling.
Q.8. Is the ban on plastic bags justified? Give reasons in three sentences.
Q.9. Name any three substances that constitute garbage.
Q.10. To what use can you put the following kinds of garbage and how?
(a) Rotting smelly garbage
(b) Dry leaves collected in a garbage
(c) Old newspapers
Q.11. Two different pits A and B are dug in soil which are 40 cm deep. Material C is placed in pit A whereas material D is placed in pit B. Both the pits were covered with soil. After a month, when pits were dug, it was found that material C remained as such whereas material D was rotten up completely.
(a) Identify materials C and D
(b) Which factor is responsible for causing rotting of material D?
Q.12. A is a very useful material used in our daily life in one form or other. Production of A requires cutting down of forest trees. This material is biodegradable and it can be recycled to make useful products like cardboard, bags, etc.
(a) Identify material A.
(b) List any three things made from A used in our everyday life.
Q.13. Provide a suitable term that expresses the meaning of each of the following statements.
(a) Greeting cards made from newspaper.
(b) Contents of the waste bins.
(c) Worms converting certain kinds of waste into manure.
(d) An area where a lot of garbage is collected, spread out and covered with soil.
Q.14. (a) Which kind of garbage is not converted into compost by the redworms?
(b) What are the other organisms besides redworms, which you can see in pit used for vermicomposting? Draw a figure of these.
Q.15. (a) Is garbage disposal the responsibility only of the government?
(b) Is it possible to reduce the problems relating to disposal of garbage?
Q.16. Is it better to use compost instead of chemical fertilisers? Why?
Q.17. What happens when
(a) insecticides, motor oil, paints are poured down the drain?
(b) tea leaves, cotton swabs and old soft toys are thrown into the drain?
Q.18. What useful can you make with waste materials like, powder container, cold drink cans, plastic bottles, shoe boxes.
Q.19. Precautions should be taken while storing cooked food items in plastic bags. Why?