4.5.4.2 plant hormones (SINGLE HT)

Question 1

What 3 things are Gibberellins responsible for?

Answer 1

• Cell elongation
• Seed dormancy
• Germination

Question 2

Which plant hormone ripens fruit?

Answer 2

Ethene

Question 3

As well as ripening fruit, what other roles does ethene have?

Answer 3

• Control of cell division

- Helps flowers open

Question 4

How does using auxins as selective weedkillers kill plants?

Answer 4

• Causes some plants to grow uncontrollably

- Causes some plants to stop growing

Question 5

Gardeners can take cuttings to increase the number of plants they have.
Why do they need to use auxins in this process?

Answer 5

Rooting powders contain auxins, which helps the cuttings form roots.

Question 6

Why would fruits be sprayed with ethene during a long journey?

Answer 6

They can be picked before they are ripe then sprayed to begin the ripening process a short time before they arrive at supermarket

Question 7

Which hormone is used in horticulture to begin the germination process?

Answer 7

Gibberellins

Question 8

Which hormone is used in horticulture to increase the size of the fruit?

Answer 8

Gibberellins