Question

1. what role do plants play in the carbon cycle?

Explanation:

Plants perform photosynthesis, taking in $CO_2$ from the atmosphere and converting it into organic carbon (like glucose) and releasing $O_2$. They also store carbon in their biomass. Additionally, through respiration, plants release some $CO_2$ back, but photosynthesis is the key role in carbon fixation.

Answer:

Plants play a key role in the carbon cycle mainly through photosynthesis (absorbing atmospheric $CO_2$ to produce organic matter and release $O_2$) and storing carbon in their biomass; they also respire to release some $CO_2$ back to the atmosphere.