Plant hormones

Question 1

Name a plant hormone

Answer 1

Auxin

Question 2

Where is auxin produced?

Answer 2

Near the tips of shoots and roots and it moves backwards

Question 3

What does auxin respond to?

Answer 3

Light (phototropism) , gravity (geotrism) an moisture

Question 4

What does extra Auxin do?

Answer 4

Promotes growth in the shoot but inhibits the growth in the root …. this produces the desired result

Question 5

Name and explain the 4 ways a shoot grows

Answer 5

1) Shoots grow towards light - more auxin grows on shaded side so bends towards light
2) Shoots grow away from gravity - more auxin on the lower side which causes the lower side to grow faster bending the shoot upwards
3) Roots grow towards gravity - root growing sideways will always grow on the lower side and in a root extra auxin inhibits growth and this means the cells on top elongate further and the roots bends down
4) Roots grow towards moisture - more auxin on the side with more moisture and inhibits growth on that side so it grows towards moisture

Question 6

What uses,in agriculture, do plant hormones have?

Answer 6

Weeds = broad - leaved. Selective weedkillers contain plant hormones that only affect broad-leaved plants. This disrupts their normal growth patterns and soon kills them but leaves crops untouched.
Rooting powder contains plant hormones which helps when taking cuttings