Plant Hormones

Question 1

What is auxin?

Answer 1

A plant hormone that controls growth near the tops of shorts and roots

Question 2

What does auxin grow in response to?

Answer 2

Phototropism-light
Hydrotropism-water
Geotropism-gravity

Question 3

What happens if the tip of a shoot is removed from a plant?

Answer 3

There is no auxin available and the shoot will stop growing

Question 4

What does extra auxin do?

Answer 4

Promotes growth in the shoot but inhibits growth in the root

Question 5

What happens when a shoot grows towards light?

Answer 5

When shoot is exposed to light, more auxin accumulates in the shaded side, this makes cells elongate in the shaded side and shoot bends towards light

Question 6

What happens when shoots grow away from gravity?

Answer 6

When shoot grows sideways, gravity causes unequal amount of auxin so more auxin is on the lower side, thus causes the bend to shoot upwards

Question 7

What happens when roots grow towards gravity?

Answer 7

Root growing sideways will have more auxin on lower side, but in root extra auxin inhibits growth so the root bend downwards

Question 8

What happens when the roots grow towards moisture?

Answer 8

More auxin produced on the side with more moisture, this inhibits growth in that side, causing root to bend towards the moisture

Question 9

What can plant hormones be also used for?

Answer 9

For weed killers

Plant cuttings