Which substance is used by plants as a source of food?
O water
O glucose
O oxygen
carbon dioxide

Hello!

Let's look at the equation for photosynthesis:

6CO2 + 6H20 + (energy) → C6H12O6 + 6O2

As you can see, plants produce glucose. This immediately eliminates water and carbon dioxide, as they are the reactants in photosynthesis.

During cellular respiration, glucose is "digested" in a way similar to how we digest our food.

Therefore, it is safe to assume that glucose is used by plants as a source of food.

I hope I helped!

bc blah

explanation:

bc blah

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.