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प्रश्न
The question has four options. Choose the correct answer:
Sewage water is purified by
पर्याय
microorganisms
light
fishes
aquatic plants
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उत्तर
microorganisms
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संबंधित प्रश्न
Give any two ways in which biodegradable substances would affect the environment.
How are most of the solid wastes in urban areas disposed of?
List some of the common wastes produced in mining operation and mention how these can be reused.
Give two-ecofriendly ways of treating kitchen wastes.
The question has four options. Choose the correct answer:
Composting is carried out from
Discuss:
Is it possible to reduce the problems relating to disposal of garbage?
What do you do with the leftover food at home?
Put a tick (√) against the garbage items given in Table 16.1 which could be converted into manure. Put a cross (×) against the others.
| Garbage Items | Make manure or not | |
| (i) | Egg shells | |
| (ii) | Straw | |
| (iii) | Dry flowers | |
| (iv) | Pebbles | |
| (v) | Broken pieces of glass | |
| (vi) | Nails and screws | |
| (vii) | Plastic bangles | |
| (viii) | Left over food | |
| (ix) | Steel broken vessel | |
| (x) | Dead animals |
Which one of the following is a biodegradable waste?
