Some plants (grasses) tend to contain a greater concentration of chlorophyll than others (pines). can you develop a hypothesis to explain this? would it be testable?

       The greater concentration of chlorophyll can be explained by lots of different reasons, the only thing here is to fit one of them in this problem.

Explanation:

        Let's think about it, there are some plants that need more energy than other, this can be explained by their use of energy, their production level, their storage of energy, but in this case we'll use only one of these factors, the use of energy. This plant needs a very good amount of energy to survive and spread around its seeds, this energy will mostly come from the chemical reactions happening inside of it, photosynthesis.

        This process will use the light as a source of energy, as well as CO2, turning this into energy at the end of the process. So if this plant needs more energy than the others, the levels of chlorophyll can be higher because of this. Now it's time to test it, and it can be testable by checking the quantity of chlorophyll and their production, after that, get some plants exposed to less light sources, the same species, to check the quantity of chlorophyll on it, that's one way how you can test it.