Question

When a horizontally positioned plant responds to gravity,

auxins in the lower sides of stems cause cell elongation that bends the stem upright.
the shoot bends to grow downward, toward the force of gravity.
all parts of the plant bend upward, away from the force of gravity.
auxins in the shoot cause the growth of tendrils to pull the shoot upwards.

Answer 1

Lesson 19: Tropisms and Photoperiods Unit 2: From Microorganisms to Plants

1. A - Auxins in the lower sides of stems cause cell elongation that bends the stem upright

2. C - Thigmotropism

3. A - Phototropic and Gravitropic

4. C - The production of anthocyanin and the breakdown of chlorophyll

5. D - Exposing the plant to a brief period of light in the middle of the night

Answer 2

When a horizontally positioned plant responds to gravity, then auxins in the lower sides of the stems cause cell elongation that bends the stem upright. The correct option among all the options that are given in the question is the first option. This action is mainly due to the nature of the plants to grow towards sunlight.