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प्रश्न
In an ecosystem :
(i) the flow of energy is unidirectional
(ii) the flow of materials is unidirectional
(iii) the flow of materials is cyclic
(iv) the flow of energy is cyclic.
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (i) and (iii)
उत्तर
(i) and (iii)
In an ecosystem, the flow of energy is unidirectional and the flow of materials is cyclic.
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