Oxford Revise AQA GCSE Combined Science Foundation | Chapter B11 answers

B11: The nervous system and homeostasis

Question

Answers

Extra information

Mark

AO / Specification reference

01.1

distance the ruler fell

1

AO2

4.5.2.1

01.2

any one from:

  • drop the ruler from the same height each time
  • let the ruler drop without using any force
  • use same ruler each time
  • thumb should be same distance from the ruler at the start

carry out the experiment with the lower arm resting in the same way on the table

1

AO2

4.5.2.1

01.3

0.39 / result 3, left hand

1

AO2

4.5.2.1

01.4

0.25

1

AO2

4.5.2.1

MS2b, 2f

01.5

the mean for the left hand results was quicker than the mean for the right hand results

1

AO3

4.5.2.1

01.6

there is very little difference between the left and right handed results / a very small sample was used

1

AO3

4.5.2.1

02.1

the regulation of internal conditions in response to external or internal changes

1

AO1

4.5.1

02.2

blood glucose concentration

body water concentration

1

1

AO1

4.5.1

02.3

nervous

automatic

receptors

coordination centres

effectors

1

1

1

1

1

AO1

4.5.1

03.1

independent variable – number of times stimulus was repeated

dependent variable – reaction time

control variable – Use the same computer key

two marks for all 3 boxes correct

one mark for 1 or 2 boxes correct

2

AO2

4.5.2.1

03.2

repeat number 7 (0.45)

1

AO2

4.5.2.1

03.3

distraction

accept any other sensible suggestion

1

AO3

4.5.2.1

03.4

the more times the experiment is repeated the faster the person’s response time / a person’s reaction time to a situation can improve with learning

1

AO3

4.5.2.1

04.1

maintenance of a constant internal environment

1

AO1

4.5.1

04.2

pH

temperature

allow enzyme concentration / substrate concentration for a max of 1 mark

2

AO1

4.5.1

4.2.2.1

04.3

occur without thought / conscious activity

1

AO1

4.5.1

04.4

any six from;

  • consist of receptors, co-ordination centres and effectors
  • receptors detect stimuli
  • example for receptor stated such as light / sound / temperature / pressure / other named receptor
  • co-ordination centre processes information
  • co-ordination centre named – brain / spinal cord / pancreas / other named control centre
  • effectors bring about a change
  • named effector – muscle /gland

response described – muscle contracts / gland secretes hormone

6

AO1

4.5.1

05.1

a stimulus

a receptor

an impulse

The brain

an effector

1

1

1

1

1

AO1

4.5.2.1

05.2

muscle

gland

1

1

AO1

4.5.2.1

05.3

relay neurone – transmits impulses within the CNS

motor neurone – transmits impulses between the CNS and effectors

sensory neurone – transmits impulses between receptors and the CNS

two marks for all 3 correct. Award one mark for 1 correct

2

AO1

4.5.2.1

05.4

synapse

1

AO1

4.5.2.1

06.1

blinking

coughing

1

1

AO2

4.5.2.1

06.2

rapid

automatic

1

1

AO1

4.5.2.1

06.3

B

D

C

A

three marks for all four correct sentence positions

two marks for two or three correct sentence positions

one mark for one correct sentence position

3

AO2

4.5.2.1

07.1

blood glucose concentration

body temperature

1

1

AO1

4.5.1

07.2

receptors – detect changes in the environment

effectors – bring about responses

coordination centres – receive and processes information

two marks for all 3 correct. Award one mark for 1 correct

2

AO1

4.5.1

07.3

brain / spinal cord / pancreas

1

AO1

4.5.1

08.1

whether caffeine has been drunk or not

1

AO2

4.5.2.1

08.2

height ruler was dropped from / rest hand on table / don’t apply a force when dropping the ruler / amount of caffeine taken

1

AO2

4.5.2.1

08.3

speeds up

decreases

1

1

AO3

4.5.2.1

08.4

repeat investigation / use a larger sample size

accept any sensible suggestion

1

AO3

4.5.2.1

09.1

stimulus

1

AO2

4.5.1

4.5.2.1

09.2

brain

1

AO2

4.5.1

4.5.2.1

09.3

driver would have reacted faster to the insect

responded with a reflex action

the conscious part of the brain was not involved / impulse relayed via CNS

1

1

1

AO2

4.5.2.1

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