Ans. Photosynthetic rate means the capacity which is a measure of the maximum rate which indicates how it leaves and can fix the carbon during the process of photosynthesis. This is typically measured as the amount of carbon dioxide which is fixed per meter squared as per second.The rate of photosynthesis can be defined as the terms of the rate of oxygen that is the production either per unit mass (or an area) of the green plant tissues or measured as per unit weight of the total chlorophyll.