if a plant is placed in the dark, they will take in CO2 because?

Answer 1

The plant will take in CO2 for photosynthesis during the light-independent stage. A normal plant takes in CO2 normally because of photosynthesis, as seen essentially in the below word equation:

Water+CO2-->Glucose+Oxygen

This is a simplified equation as photosynthesis does not actually work entirely in that way. Photosynthesis has two stages, namely the light-dependent and the light-independent stage.

In the light-dependent stage, light energy is used to cause water to separate into its components, namely hydrogen ions and oxygen gas. This process is called photolysis. In the light-independent stage, the hydrogen ions react with carbon dioxide to form glucose. Light is not required in this stage and hence, the plant can still take in CO2 for photosynthesis despite it being in the dark.

Answer 2

In the dark, most plants will take in oxygen because they respire in the dark but photosynthesize in light (taking in CO2).

However, a few groups of plants do take in CO2 in the dark. They are called CAM plants; CAM stands for crassulacean acid metabolism because it was first discovered in the succulent plant family Crassulaceae (it has since been found in other groups of plants ... mostly epiphytes ... including bromeliads).

Answer 3

If they are not absorbing energy, they are putting out energy. For every action there is an equall and opposite reaction.