In other words the plant does not make more and more product. Similarly you could give a plant lots of carbon dioxide but if there is not enough light then the rate of photosynthesis will be limited by the amount of light. The rate of photosynthesis may be limited by low temperature, a shortage of carbon dioxide or a shortage of light. Drag the correct term to make the statement true. Photosynthesis and Respiration It is extremely important to appreciate the close links between photosynthesis and respiration.
Many students tend to forget that plants are living things and respire.
They tend to think only of photosynthesis when thinking about plants. Many exam questions try to assess the candidate's appreciation of the links. Plants are respiring all the time but photosynthesising only when light is available. This means that the levels of the gases carbon dioxide and oxygen vary in the atmosphere around the plant depending on whether it is day or night. During the day the level of oxygen will rise due to photosynthesis producing more oxygen than is being used for respiration.