Question

Where does a plant get the carbon dioxide that it needs for the dark reaction of photosynthesis? air water food soil

Answer 1

Air

Step-by-step explanation:

On the surface of their leaves plants have pores which absorb sunlight, water, O2 and in this case CO2

Answer 2

Air

Step-by-step explanation:

Plants fix carbon dioxide into glucose in presence of sunlight by the process of photosynthesis. The small pores present mainly at the surface of leaves of plants are called stomata. Stomata serve as site for entry of carbon dioxide from air into the leaf cells. This CO2 from air is then fixed into the glucose via Calvin cycle of photosynthesis.