Question

the molecules containing energy used by the roots, stems, and other parts of the plant are ______.

obtained directly from the soil that the plant grows in

transported there from the sites of photosynthesis

made in these structures of the plant

Explanation:

• Option 1: Soil provides water and minerals, not energy - containing molecules (like glucose) for plants, so this is incorrect.
• Option 2: Photosynthesis occurs in leaves (sites of photosynthesis), producing glucose (energy - rich molecule). This glucose is then transported to other parts (roots, stems) of the plant. So this option is correct.
• Option 3: Roots and stems do not perform photosynthesis (the process to make energy - containing molecules like glucose); photosynthesis is mainly in leaves. So this is incorrect.

Answer:

B. transported there from the sites of photosynthesis (assuming the options are labeled as A, B, C with A being "obtained directly from the soil that the plant grows in", B being "transported there from the sites of photosynthesis", C being "made in these structures of the plant")