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| Column-$I$ | Column-$II$ |
| $(i)$ Ecosystem | $(P)$ Bacteria,Fungi |
| $(ii)$ Food chain | $(Q)$ Nutrient cycling |
| $(iii)$ Birds | $(R)$ Primary consumer |
| $(iv)$ Decomposers | $(S)$ Deer |
| $1$. Standing state | $p$. Mass of living material at a given time |
| $2$. Pioneer species | $q$. Amount of nutrients in the soil at a given time |
| $3$. Detritivores | $r$. Species that invade a bare area |
| $4$. Standing crop | $s$. Breakdown detritus into smaller particles |
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