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1.(ii) Because the plant has light and snail provides CO2 for photosynthesis.
2.(v) Because the plant has no light and cannot perform photosynthesis.
3.(ii) Snail must be consuming oxygen but it releases Co2 essential for photosynthesis and again oxygen is released. Therefore the oxygen is maintained and maximum in 2
4.(ii) Due to photosynthesis
5.(v) Obviously no oxygen after sometime and over that no photosyntesis
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