Question

Sunil tried to match the tropic movements in plants with the stimulus they respond to. The tabulation is given below:

	Tropism	Stimulus
P	Thigmotropism	Touch
Q	Geotropism	Water
R	Chemotropism	Chemicals
S	Phototropism	Gravity

Identify the correct pair:

Options

• P and R

• Q and S

• R and S

• P and S

Answer 1

P and R

Explanation:

Climbing tendrils exhibit thigmotropism, which is a plant’s touch response. Chemotropism is the process of growing in response to chemical cues, such as pollen tubes moving towards ovules. These are properly matched. Geotropism responds to gravity, not water, while phototropism responds to light instead.