Oxford Revise AQA GCSE Combined Science Foundation | Chapter B7 answers

B7: The spread of diseases

Question

Answers

Extra information

Mark

AO / Specification reference

01.2

caused by a pathogen

can be spread between organisms

1

1

AO1

4.3.1.1

01.3

tobacco mosaic virus (TMV) / rose black spot

accept other named plant communicable disease

1

AO1

4.3.1.1

02.1

Feature

Bacteria

Viruses

causes disease by producing toxins

uses host organism’s cells to reproduce

divide by binary fission

award one mark for each correct row

3

AO1

4.3.1.1

02.2

measles

HIV

1

1

AO1

4.3.1.2

02.3

protist

1

AO1

4.3.1.5

02.4

mosquito

1

AO1

4.3.1.5

03.1

raw meat – cook thoroughly

sneezing – wear mask to cover nose and mouth

contaminated water – use sterilising tablets before consuming

open wounds – cover with a dressing

1 mark for one correct

2 marks for two correct

3 marks for all correct

3

AO2

4.3.1.1

03.2

bacteria

viruses

2

AO1

4.3.1.1

03.3

students in close contact / students exposed to many other students

1

AO3

4.3.1.1

04.1

measles – virus

salmonella – bacteria

rose black spot – fungus

malaria – protist

1 mark for one correct

2 marks for two correct

3 marks for all correct

3

AO1

4.3.1.2

4.3.1.3

4.3.1.4

4.3.1.5

04.2

fever / red rash

1

AO1

4.3.1.2

04.3

droplet infection

1

AO1

4.3.1.2

04.4

14.4 × 66 = 950.4

1

AO2

4.3.1.2

MS1c

04.5

1204 – 14.4 = 1189.6

1

AO2

AO3

4.3.1.2

MS1c

05.1

communicable

protist

mosquitoes

high

1

1

1

1

AO1

4.3.1.5

05.2

insect nets placed over beds: prevents mosquito biting / prevents contact with person

spraying buildings with insecticides: kills mosquitos

anti-malarial drugs: kills protist

1

1

1

AO1

4.3.1.5

05.3

less access to healthcare/sanitation

accept other reasonable suggestion

1

AO3

4.3.1.5

06.1

bacteria

1

AO1

4.3.1.1

06.2

can be passed between organisms/people

1

AO1

4.3.1.1

06.3

vaccinate livestock to prevent infection

cook meat thoroughly before consumption

accept other reasonable suggestion

2

AO2

4.3.1.3

06.4

any two from:

  • fever
  • abdominal cramps
  • vomiting
  • diarrhoea

2

AO1

4.3.1.3

07.1

fungus

1

AO1

4.3.1.4

07.2

any two from:

  • Purple / black spots on leaves
  • Leaves yellow
  • Leaves drop early

2

AO1

4.3.1.4

07.3

less chlorophyll present

this reduces photosynthesis (in chloroplasts)

less glucose for respiration

2

AO1

4.3.1.4

07.4

any two from:

  • use fungicides
  • use disinfectant on tools/area around plant/on footwear
  • remove infected leaves/plants

2

AO1

4.3.1.4

08.1

caused by a microorganism/pathogen

spread between organisms/plants

1

1

A01

4.3.1.1

08.2

discoloured

chlorophyll

photosynthesis

growth

4

A01

4.3.1.2

08.3

any two from:

  • use chemicals / disinfectant on tools
  • use pesticides / insecticides
  • burning of crop
  • removal of soil around infected plants

2

AO3

4.3.1.2

09.1

tobacco mosaic virus (TMV) discolouration of leaves

gonorrhoea yellow or green discharge from sexual organs

rose black spot purple or black spots on leaves

Salmonella fever, vomiting, diarrhoea

1 mark for one correct

2 marks for two correct

3 marks for all correct

3

AO1

4.3.1.2

4.3.1.3

4.3.1.4

4.3.1.5

09.2

HIV

gonorrhoea

condoms

barrier

accept other correctly named STD for either / both of the first two marks

1

1

1

1

AO1

4.3.1.2

4.3.1.3

09.3

send infected children home

prevent visitors from coming into the school

wash surfaces down with disinfectant

3

AO3

4.3.1.1

10.1

fungus

AO1

4.3.1.4

10.2

fungicide

AO1

4.3.1.4

10.3

antibiotics are only used to treat bacterial infections

rose black spot is caused by a fungus so antibiotic do not work

1

1

AO2

4.3.1.3

4.3.1.4

11.1

A – oesophagus

B – stomach

C – small intestine

D – large intestine

1

1

1

1

AO2

4.2.2.1

11.2

small intestine

1

AO1

4.2.2.1

11.3

to produce enzymes

1

AO1

4.2.2.1

12.1

1 µm

1

AO1

4.1.1.1

12.2

plant cell walls contain cellulose

or bacterial cell walls contain peptidoglycan

accept converse arguments

1

AO1

4.1.1.1

12.3

flagellum / flagella

1

AO1

4.1.1.1

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