A grapevine growing around a fence post is an example of
A phototropism
B photoperiodism
C geotropism
D thigmotropism
The answer is positive thigmotropism
Thigmotropism
thigmotropism!!
A grapevine growing around a fence post is an example of D) thigmotropism.
Explanation:
Thigmotropism is a type of tropism in which plant growth is influenced by touch or physical contact with an object. In the case of a grapevine growing around a fence post, the vine's growth pattern is directed by its interaction with the physical structure of the post.
To determine the correct answer, let's analyze the other options:
A) Phototropism: Phototropism refers to the growth of a plant in response to light. In the case of a grapevine growing around a fence post, light is not the primary factor directing its growth.
B) Photoperiodism: Photoperiodism refers to the response of plants to the duration of light and dark periods. This is not applicable in the context of a grapevine growing around a fence post.
C) Geotropism: Geotropism, also known as gravitropism, is the response of a plant to gravity. It influences the growth direction of roots (positive geotropism) and shoots (negative geotropism). However, in the case of a grapevine growing around a fence post, gravity is not the main factor guiding its growth.
Therefore, the correct answer is D) thigmotropism.