Question

Nastic movement in a plant is a non-directional response to external

stimuli - like a venus fly trap closing whenever a fly lands on it.
Thigmotropism is the general movement response of a plant in a
particular direction, like a vine wrapping around a pole. When a plant
bends its stems or leaves to respond, this is caused by a hormone. What
parts of the plant would help carry the hormones to the stems and leaves
to help them bend?

Answer 1

Plant movements like nastic responses and thigmotropism are controlled by hormones such as auxins, which are distributed through the xylem and phloem.

Step-by-step explanation:

In plants, movement or growth in response to external stimuli is known as tropism. Nastic movements, such as the closing of a Venus flytrap, are non-directional responses, while thigmotropism is a directional response, such as vines wrapping around a pole.

The hormones responsible for these growth patterns are distributed throughout the plant by the vascular system, consisting of the xylem and phloem. These hormones, particularly auxins, play a key role in the plant's ability to bend stems and leaves, as they induce differential growth rates on opposite sides of the stem or tendril. Moreover, substances like jasmonic acid can also influence plant behavior, triggering tendril coiling even without a mechanical stimulus.