Unit 6 Plant growth response

Question 1

What’s is tropism and what are the types

Answer 1

Directional growth response in plants
Phototropism
Gravitropism

Question 2

What is troprism controlled by

Answer 2

Is controlled by IAA a plant growth factor

Question 3

What is IAA and where is found

Answer 3

Is a plant growth factor that controls cell elongation in shoots and inhibits growth in roots
•Found in the tip of shoots and roots
•Can diffuse to other cells

Question 5

Describe positive phototropism and where does it occur

Answer 5

In shoots
•IAA produced in tip of the shoot
•IAA diffused to the shaded area which promotes growth and cell elongation
•this causes the shoot to bend towards light

Question 6

Describe negative phototropism and where it occurs

Answer 6

Occurs in roots

IAA inhibits growth and cell elongation do root bends away from light

Question 7

What is gravitropism

Answer 7

Shoots and roots grow in response to gravity

Question 8

What is positive gravitropism and where it occurs

Answer 8

Occurs in roots

• IAA diffuse on the lower side of the root
• elongate root would it bends towards gravity(down)

Question 9

What’s negative gravitropism and where does it occur

Answer 9

Occurs in shoots
•IAA diffuse to lower side of shoot
•causing the shoot to elongate and plant grows upwards

Question 11

What’s phototropism

Answer 11

Shoots and roots grown in response to light due to IAA