Plant hormones.- PAPER 2

Question 1

Where is Auxin produced and what is it used for?

Answer 1

Auxin is produces in the tips of plants and controls growth near the tips of shoots and roots, in response to light and gravity. (Phototropism and Gravitropism).

Question 2

When a shoot tip is exposed to light, what causes it to bend towards the light?

Answer 2

More auxin accumulates on the side that is shady and that causes the cells to elongate quicker on the shaded side, so the shoot bends towards the light.

Question 3

What causes a shoot to bend upwards when effected by gravity?

Answer 3

More auxin is on the lower side of the shoot when sideways, so this causes the lower side to grow faster, causing the shoot to grow upwards.

Question 4

What are the uses of auxin?

Answer 4

• Killing Weeds

* Growing cells in tissue culture.

Question 5

What is Gibberellin and what does it do?

Answer 5

It is another plant growth hormone and it stimulates seed germination, Stem growth and Flowering.

Question 6

What are the uses of Gibberellin?

Answer 6

• Growing larger fruit.

* Allow flowering to occur.