tropisms

Question 1

tropism definition

Answer 1

the growth of part of a plant in response to a direct stimulus

Question 2

uses of plant growth factors

Answer 2

• selective weed killers
• stimulus formation of fruits
• hormones rooting powders

Question 3

what does IAA stand for and what does it affect

Answer 3

indole acetic acid, affects cell elongation

Question 4

what does IAA do in shoots and roots

Answer 4

causes elongation in shoots but inhibits elongation in roots

Question 5

positive phototropism in shoots (where does the IAA diffuse)

Answer 5

diffuses to the shaded side and stimulates elongation, cells elongate faster and shoot bends upwards towards light

Question 6

negative gravitropism (where does the IAA diffuse)

Answer 6

diffuses to the lower side and stimulates elongation, cells elongate faster and shoot bends upwards towards light

Question 7

negative phototropism in roots (where does the IAA diffuse)

Answer 7

diffuses to shaded side of shoot to inhibit elongation, elongates slower on that side and causes root to bend away from light

Question 8

positive gravitropism in roots (where does the IAA diffuse)

Answer 8

diffuses to the lower side and inhibits elongation, elongates slower on that side and causes root to bend away from light

Question 9

gibberellins and ethene function

Answer 9

gibberellins - promote seed germination
ethene - inhibits growth and elongation