Answers

2015-04-20T21:11:22+05:30
Some plants open their stomata during the day time, But some plants take for example desert plants open their stomata at night because they have a different photosynthesis pathway. 
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2015-04-20T21:21:25+05:30
Mostly many of the plants open stomata during day.but some plants in desert open stomata during night , in order to reduce water transpiration during day.
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