Question

final assessment - plant science basics: plant processes
plant science basics: plant processes
19 of 20
which of the following macro-nutrients are sourced from the atmosphere?
○ potassium
○ carbon
○ hydrogen
○ calcium

Explanation:

Plants take in carbon in the form of carbon dioxide ($\ce{CO_2}$) from the atmosphere during photosynthesis. Potassium, hydrogen (from water, not atmosphere for plant nutrient sourcing in this context), and calcium are typically sourced from the soil, not the atmosphere. So among the options, carbon is the macro - nutrient sourced from the atmosphere.

Answer:

B. Carbon