Multiple choice questions XXXXVII — task. Science CBSE, Class 10.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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1. Flow of energy in an ecosystem is always

multidirectional
unidirectional
bidirectional
no specific direction

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

Only (iii)
(i) and (iii)
(ii) and (iv)
Only (iv)

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