U6T1 – Responses in Plants

Responses in Plants

1 / 20

Plant responses to stimuli are controlled by what?

Photosynthesis

Growth Factors

Action Potentials

2 / 20

What word describes the growth response of a plant to a stimulus?

Tropism

Trophism

Tropasm

3 / 20

What is a growth response to light called?

Flurotropism

Gravitropism

Phototropism

4 / 20

What response do roots have to light?

Negatively Geotrophic

Positively Phototrophic

Negatively Phototrophic

5 / 20

Which of the following is an example of a plant growth factor?

Indyacetic Acid

Indoleacetic Acid

Indayloacetic Acid

6 / 20

What affect does IAA have on shoot tips?

Mitosis

Elongation

Inhibition

7 / 20

How does IAA bring about this effect?

Stimulates reactions to increase the amount of cellulose in the cell wall, so it can grow.

Stimulates reactions to make the membrane more fluid.

Stimulates reactions which break the bonds between the cellulose molecules in the cell wall.

8 / 20

What effect does low concentrations of IAA have on root tissue?

Stimulates growth.

Inhibits growth.

Increases active transport.

9 / 20

What effect does high concentrations of IAA have on shoot tip tissue?

Stimulates growth.

Inhibits growth.

Increases active transport.

10 / 20

Which of the following is true?

If IAA is unevenly distributed, then growth is evenly distributed and the tissue grows straight. If IAA is evenly distributed, the growth is uneven and the tissue bends.

If IAA is evenly distributed, then growth is evenly distributed and the tissue grows straight. If IAA is unevenly distributed, the growth is uneven and the tissue bends.

11 / 20

In shoot tips which are lit from the side, where will the highest concentration of IAA be found?

The lit side ( illuminated)

The shaded side

Both sides evenly

12 / 20

In root tips growing parallel to the soil, where will the highest concentration of IAA be found ?

The upper surface

The lower surface

Both even

13 / 20

How does IAA become unevenly distributed?

Bright light destroys IAA.

Shade stimulates the production of IAA.

IAA moves away from light.

14 / 20

What does Darwin's experiment where he removed a shoot tip then replaced it show?

That the shoot tip is not needed for shoot growth.

That the shoot tip is responsible for shoot growth.

That growth is controlled below the shoot tip.

15 / 20

What does Darwin's experiment where he placed a black cover over the tip show?

That directional light on the tip effects the direction of growth.

That directional light does not effect direction of growth.

That aluminium foil is toxic to shoot tips.

16 / 20

What does Boysen and Jensen's experiment using agar show?

That gelatin blocks can stimulate growth.

That the tip can be removed and the shoot still grow normally.

That the signal produced by the plant can pass through gelatin.

17 / 20

Which of these statements about Went's experiment is NOT true?

That plant growth is probably caused by a chemical which can diffuse.

That a substance produced in the tip can move (diffuse) into gelatin, and then out again.

Gelatin blocks stimulate growth.

18 / 20

What does this experiment by Went show?

That uneven distribution of a chemical from a shoot tip controls growth.

That even distribution of a chemical from a shoot tip controls growth.

That gelatin controls growth.

19 / 20

What would be a suitable control for Went's experiment ?

The same experiment, but with a different species of plant shoot.

The same experiment but with a gelatin block without a shoot tip having been placed on it.

The same experiment, but with light coming from the opposite direction.

20 / 20

Mica is like thin glass, and is impermeable to most substances. What does Boysen Jensen's experiment inserting mica show ?

That chemicals diffuse down the shoot from the tip.

That chemicals move away from light.

That chemicals move away from light and diffuse down from the tip.

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