Question

Match list I with list II and choose the correct option.

	Tropism		Stimulus
A	Phototropism	I	Water gradient
B	Geotropism	II	Chemical substance
C	Chemotropism	III	Gravity
D	Hydrotropism	IV	Light

• A. A - I, B - IV, C - III, D - II
• B. A - II, B - I, C - IV, D - III
• C. A - III, B - II, C - I, D - IV
• D. A - IV, B - III, C - II, D - I

Answer 1

Answer: (D)

A - IV, B - III, C - II, D - I

Phototropism is the growth movement of plants in response to light (e.g. movement of sunflower in the direction of light).

Geotropism is growth movement by a plant in response to gravity (e.g. most of the roots grow downwards).

Chemotropism is the growth movement of plants, in response to a chemical substance. (e.g. movement of pollen tubes towards ovary).

Hydrotropism is the growth movement of plants in response to water gradient. (e.g. growth movement of roots in the soil in search for water.

So, the correct answer is option D.