response to stimuli

Question 1

what is a stimulus

Answer 1

detectable change in the internal/external environment of an organism that leads to a response

Question 2

receptor definition

Answer 2

detects stimulus, specific to one type of stimulus.

Question 3

coordinator definition

Answer 3

formulates a suitable response to a stimulus e.g. nervous system / hormonal system

Question 4

effector definition

Answer 4

produces response to a stimulus e.g. muscles / glands

Question 5

response

Answer 5

This response may be at the molecular level or involve the behaviour of a whole organism.

Question 6

kinesis definition

Answer 6

A kinesis is a non-directional simple response used by simple mobile organisms who change the speed of movement or the rate of direction change, in response to a non-directional stimulus.

Question 7

taxis definition

Answer 7

A taxis is a simple, directional responses determined by the direction of the stimulus. Used by simple mobile organisms who move towards or away from a stimulus.

Question 8

tropism definition

Answer 8

A tropism is the growth of part of a plant in response to a directional stimulus.