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Question : Compensation point - Define. |
Answer» Solution :At dawn and dusk the intensity of light is low. The point at which `CO_2` released in respiration is exactly COMPENSATED by `CO_2` fixed in photosynthesis that means no net gaseous exchange TAKES place, it is called COMPENSATION point. At this moment, the amount of oxygen released from photosynthesis is equal to the amount of oxygen utilized in respiration. The two common factors associated with compensation point are `CO_2` and light (Figure). Based on this there are two types of compensation point. They are `CO_2` compensation point and light compensation point. `C_3` plants have compensation point RANGING from 40-60 ppm (PARTS per million) `CO_2` while those of `C_4` plants ranges from 1-5 ppm `CO_2`. 
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