Question

question 3
match each type of tropism (column a - question) with the correct stimulus and plant response (column b - answer).
each answer may be used once, more than once, or not at all.
make like a plant and bloom!
column a

1. phototropism
2. gravitropism (geotropism)
3. thigmotropism
4. hydrotropism

column b
a. roots growing downward into the soil due to gravity
b. a plant stem bending toward sunlight
c. roots growing toward higher water concentration in soil
d. the leaves of a plant dropping in the fall
e. a vine wrapping around a fence post

Explanation:

Phototropism is the growth of a plant in response to light, so a plant stem bending toward sunlight is the correct response. Gravitropism (Geotropism) is the growth of a plant in response to gravity, thus roots growing downward into the soil due to gravity is appropriate. Thigmotropism is the growth response to touch, and a vine wrapping around a fence - post is an example. Hydrotropism is the growth response to water, so roots growing toward higher water concentration in soil is correct.

Answer:

1. B. A plant stem bending toward sunlight
2. A. Roots growing downward into the soil due to gravity
3. E. A vine wrapping around a fence - post
4. C. Roots growing toward higher water concentration in soil