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In the dark plants respire instead of photosynthesizing. In this period they uptake Oxygen and expel Carbon dioxide via Gas exchange.
== Transpiration ==
The cultivar constantly moves water around internally and releases water vapour into the environment through the stomata. The rate of transpiration is correlated to the light intensity the plant is being exposed to i.e. High light intensity equals high rate of transpiration. The rate of transpiration also indicates the rate of nutrient uptake.
==Circadian rhythm==
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