Reaction To Stimuli

Question 1

What is taxes?

Answer 1

A directional response of a motile organism to a stimulus
-extra = only in animals

Question 2

What are the two types of taxes?
What do they do?

Answer 2

Positive-move toward the stimulus

Negative- move away from the stimulus

Question 3

What are the taxes for -
•light
•chemicals
•water
•gravity

Answer 3

Phototaxes
Chemotaxes
Hydrotaxes
Gravitaxes or geotaxes

Question 4

What is kinesis?

Answer 4

A directional response to a stimulus.
•movement is random
•doesn’t move directly to the stimulus, they changes the speed of direction change

Question 5

What will happen in kinesis if the environment is favourable?

Answer 5

The rate of direction change will increase

Question 6

What will happen if the environment is unfavourable?

Answer 6

The rate of direction change will decrease

Question 7

What is tropism? It

Answer 7

When plant react to a stimulus

Question 8

What are the 3 main types of tropism?

Answer 8

Phototropism
Gravitropism
Hydrotropism

Question 9

What is IAA (auxin) and what does it do?

Answer 9

It is a photosensitive molecule that promotes growth in the plant tip.

Leading to elongation on the side with the build up on IAA

Question 10

What does IAA do in the roots?

Answer 10

In inhibits grows leading to the side without auxin to elongate