Question

question 47
all living things need carbon. how does most carbon enter the living portion of an ecosystem?
○ atmospheric co₂ taken in by photosynthesis
○ elemental carbon taken in by plant leaves
○ atmospheric co₂ taken in by soil bacteria
○ elemental carbon taken in by plant roots

Explanation:

Plants (producers) are the base of the food chain in most ecosystems. Through photosynthesis, they take in atmospheric \(CO_2\) (a form of carbon) and convert it into organic compounds (like glucose, which contains carbon). These plants are then consumed by herbivores, and the carbon moves up the food chain. Elemental carbon is not directly taken in by plant leaves or roots in a significant way for most carbon entry into the living portion. Soil bacteria do not play the primary role in taking in \(CO_2\) for the major entry of carbon into the living part of the ecosystem compared to plant photosynthesis.

Answer:

Atmospheric \(CO_2\) taken in by photosynthesis