Plant hormones - shoots

Question 1

What do hormones make sure plants do?

Answer 1

Grow in useful directions

Question 2

What is the plant growth hormone called?

Answer 2

Auxin

Question 3

Where does auxin control growth? (2 places)

Answer 3

Near the tips of SHOOTS and ROOTS

Question 4

What are the 3 things auxin responds to when controlling the plant’s growth?

Answer 4

1. Phototropism (LIGHT)
2. Gravitropism or geotropism (GRAVITY)
3. Moisture
   (think: what are the ‘tropes’ of the controlling powers?)

Question 5

Why does auxin move backwards in the tips?

Answer 5

To stimulate the cell elongation process

Question 6

Where does the cell elongation process occur?

Answer 6

Just behind the tips (of the shoots or roots)

Question 7

What happens if the tip of a shoot is removed?

Answer 7

No auxin is available and the shoot may STOP growing

Question 8

How does auxin affect a plant’s shoots?

Answer 8

It promotes growth there

Question 9

Do shoots grow towards or away from light?

Answer 9

Towards

Question 10

When a shoot is exposed to light does more auxin accumulate on the side that’s:

a) in the shade?
or
b) in the light?

Answer 10

a) iIn the SHADE

Question 11

What does a higher accumulation of auxin in the shaded side of the shoot mean?

Answer 11

That the auxin makes the cells grow (elongate) faster on the shaded side, so the shoot bends TOWARDS the light