In an experiment, a student removes all the leaves of a geranium plant. Several days later, the student notices new leaves growing from the stem.

Question

Which source of energy is needed for the new leaves to grow?
A. starch stored in the roots
B. water absorbed by the roots
C. fertilizer absorbed by the roots
D. photosynthesis occurring in the roots

Answer 1

The correct answer is A. starch stored in the roots. When the leaves are removed, the plant can rely on the stored starch in the roots as an energy source for new leaf growth. Water absorbed by the roots is important for overall plant health, but it is not specifically needed for new leaf growth. Similarly, fertilizer absorbed by the roots contributes to plant nutrition, but it is not the direct source of energy for leaf growth. Photosynthesis occurs in the leaves, not the roots, and is responsible for producing glucose, which is then converted into starch and stored in the roots.