Answers

2014-05-09T11:31:30+05:30
Plant need co2 for respiration and o2 for making food in there leaves


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2014-05-09T11:42:08+05:30
Plants need both CO2 and O2 because plants make their own food only in the presence of the sunlight because photosynthesis need sunlight for the preparation of o2 but they need oxygen from the surroundings for respiration and that they need the whole day and whole night.

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