Question

Why might the scientists have chosen changes in

CO2 as an indicator of photosynthesis rather than
changes in the quantity of energy rich compounds
such as ATP and NADPH within the leaves?

Answer 1

Because it is easier to measure

Step-by-step explanation:

Measuring the production of ATP or NADPH is challenging and requires some advanced methods in a a research laboratory.

However, the production of a gas is much easier to measure, and can be done in school laboratories. For example, by observing the production of bubbles or using a gas cylinder can tell how much CO2 is being produced.