JEE Main and Advanced

Shortcut Methods and Tricks:

Use the law of conservation of mass. This states that the total mass of the products of a reaction must be equal to the total mass of the reactants. In the case of photosynthesis, this means that the mass of CO2 fixed must be equal to the mass of oxygen released.
Use the ideal gas law. This states that the pressure, volume, and temperature of a gas are all related. If the temperature and volume are constant, then the pressure will be proportional to the number of moles of gas. In the case of photosynthesis, this means that the rate of oxygen released will be proportional to the number of moles of CO2 fixed.
Use the Beer-Lambert law. This states that the intensity of light decreases exponentially as it passes through a medium. In the case of photosynthesis, this means that the rate of photosynthesis will decrease as the light intensity decreases.

Time-Saving Tips:

Simplify the problem. If a problem is too complex, try to simplify it by making some assumptions. For example, you could assume that the temperature and carbon dioxide concentration are constant.
Use dimensional analysis. This technique can be used to check your answer and make sure that the units are correct. For example, if you are calculating the rate of photosynthesis in mg CO2/m2/hr, then your answer should have the units mg CO2/m2/hr.

CBSE Board

Shortcut Methods and Tricks:

Use the Bunsen-Roscoe law. This states that the rate of photosynthesis is proportional to the square root of the light intensity.
Use the Blackman curve. This curve shows the relationship between the rate of photosynthesis and the temperature and carbon dioxide concentration.
Use the leaf area index. This is a measure of the amount of leaf area per unit ground area. It can be used to estimate the total amount of photosynthesis that can be carried out by a plant.

Time-Saving Tips:

Use graphs. Graphs can be used to visualize the relationships between different variables. They can also be used to interpolate and extrapolate data.
Use tables. Tables can be used to organize data. They can also be used to compare different treatments.