JAMB - Biology (1981 - No. 36)
Growing yam tendrils climb for support. This growth response is
haptotropism
geotropism
phototropism
hydrotropism
chemotropism
ব্যাখ্যা
- Haptotropism / thigmotropism is the movement or change in orientation of a plant's growth as a reaction to touch. The orienting factor is generally a hard surface that can change the direction of the plant's growth or the growth of one of its organs.
- The movement of parts of a plant (especially tendrils) in response to a touch stimulus.