Discussion
In plant growth movement, the differential growth response with greater growth on the lower surface of an organ is known as:
Answer: D
Hyponasty is the growth movement in which the lower surface of an organ grows faster, so the organ bends upward. Epinasty is the opposite, with greater growth of the upper surface, causing downward bending of leaves.
Phototropism and geotropism are tropisms directed by light and gravity, not nastic responses to growth on one surface.
Nastic movements are responses of plant organs to stimuli that do not depend on the direction of the stimulus, unlike tropisms. Epinasty and hyponasty are due to unequal growth on the two sides of an organ, with epinasty being faster growth on the upper side and hyponasty on the lower.
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