Plants take carbon dioxide from the atmosphere mainly through their: Option A: roots Option B: stem Option C: flowers Option D: leaves

Answer: Plants mostly absorb CO₂ from the atmosphere via their leaves. Stomata are the microscopic openings upon the leaves’ surface. 

Stomata are small apertures found on the leaf epidermis. Stomata are found on stems as well as other plant components in some plants. These pores open / close in response to the ambient environmental circumstances. They contribute to gas exchange throughout photosynthesis & respiration. To close & open stomata, guard cells contained in stomata conduct this procedure by storing & draining the liquid in it. 

Therefore the answer is option D – Leaves