Tropism

Auxins are responsible for _____________ of a plant

• Colour change

• Watering

• Phototropism

• Growth

Tags

NGSS.MS-LS1-5

The figure above shows four coleoptiles P, Q, R and S that are exposed to unilateral light. After two days, which coleoptile will move towards the light?

• P only.

• R only.

• P and R only.

• P, Q and S only.

The figure above shows an experiment

that is done on two plants of the same species. Both plants are left in the open.

What will happen to the two plants after two weeks

I Plant B bends towards the opening of

the box.

II The auxin in stem A is evenly distributed.

III The auxin in stem B is distributed

unevenly.

IV Plant A bends to the right.

• I, II and III only.

• I, II and IV only.

• I, III and IV only.

• II, III and IV only.

The figure below above shows an experiment to study the effect of auxin towards the growth of the coleoptiles. Which of the following conclusions are true about the experiment?

I Auxin is produced at the tip of the

coleoptiles and diffuses to the bottom to stimulate

growth.

II The supply of auxin is cut off in the

dark.

III Auxin cannot penetrate a mica plate.

IV Auxin can diffuse through a block of

agar-agar.

• I, II and III only.

• I, III and IV only.

• II, III and IV only.

• I, II, III and IV.

• (1)

• (2)

• (3)

• A

• B

• C

• D