Plant Growth Regulators

Question 1

Why and What?

Answer 1

Plants are sessile, so body shape is able to change in order to adapt to environment –>
Do this with plant growth regulators: chemicals that signal plant cells to undergo changes

Question 2

Tropisms

Answer 2

Directional change in growth or movement, in response to a stimulus

Question 3

Types of Tropisms

Answer 3

A plants growth in response to . . .
1. Light (typically towards) - phototropism
2. Gravity - gravitropism
3. Touch - thigmotropism
4. Availability of water - hydrotropism

Question 4

Auxins

Answer 4

Plant hormones that promote cell elongation –> helps with bending

Question 5

Gibberellins

Answer 5

Plant hormones that promote cell division and fruit production –> farmers can use to make fruit larger and more appealing

Question 6

Ethylene Gas

Answer 6

“Stress hormone” that helps protect plant against environmental stress –> released as fruit ripens, causing further ripening (food producers can add or absorb ethylene to quicken or prevent ripening)