Question

Why production of starch is often used as a measure of photosynthesis although immediate product of photosynthesis is glucose?

Answer 1

Production of starch is used as a measure of photosynthesis because of the following reasons:

Glucose is considered the byproduct. However, it is not easy to identify the substance.

One of the most important evidences is the starch that can help to evaluate the efficiency of the food generation process.