Question

which structure of a plant controls the rate of photosynthesis? (1 point)
roots
leaves
flowers
stems

Explanation:

Leaves are the main organs for photosynthesis. They contain chloroplasts (where photosynthesis occurs) and stomata. Stomata regulate gas exchange (intake of \(CO_2\) and release of \(O_2\)). The opening and closing of stomata (controlled by guard cells) affects the rate of photosynthesis as \(CO_2\) is a reactant. Roots mainly absorb water and minerals. Flowers are for reproduction. Stems support the plant and transport substances but do not directly control the rate of photosynthesis like leaves do.

Answer:

Leaves