PDF chapter test TRY NOW
1. Flow of energy in an ecosystem is always
2. In the following groups of materials, which group(s) contains only non-biodegradable items?
(i) Wood, paper and leather (ii) Polythene, detergent and PVC
(iii) Plastic, detergent and grass (iv) Plastic, bakelite and DDT
(i) Wood, paper and leather (ii) Polythene, detergent and PVC
(iii) Plastic, detergent and grass (iv) Plastic, bakelite and DDT
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