Responses and stimulii

Question 1

what is kinesis

Answer 1

non-directional movement

in response to a stimulus

Question 2

what is tropism?

Answer 2

the response of a plant to a directional stimulus

Question 3

what is taxis?

Answer 3

directional movement in response to a stimulus

Question 4

outline gravitotropism in the root

Answer 4

IAA produced in the tip of root
IAA transported along the root
gravity causes IAA to move to the lower side of the root
there is a higher concentration of IAA in the lower side
in root IAA inhibits growth of the cells of the lower side
the root grows towards gravity

Question 5

outline gravitiotropism in the shoot

Answer 5

IAA produced in the tip of the shoot
IAA transported along the shoot
gravity causes IAA to move to the lower side of the shoot
there is a higher concentration of IAA in the lower side
in shoot IAA causes elongation of the cells of the lower side
the shoot grows upwards away from gravity

Question 6

outline phototropism in the shoot

Answer 6

IAA produced in tip of the shoot
IAA transported down the shoot
Light causes IAA to move to the dark side
there is a higher concentration of IAA on the shaded side
IAA on the shaded side causes cells to elongate
the shoot tip grows towards the light

Question 7

what is a positive response

Answer 7

a response that acts towards the stimulus

Question 8

what is a negative response

Answer 8

a response that acts away the stimulus

Question 9

what happens to a plant if the tip is removed

Answer 9

there is no IAA

there is no tropism

Question 10

what is a stimulus

Answer 10

change in the internal or external enviroment of an organism

Question 11

what does a stimulus cause

Answer 11

the organism to respond which increases the chance of survival