Oxford Revise AQA GCSE Combined Science Foundation | Chapter B4 answers

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Question Answers Extra information Mark AO / Specification reference
01.1

Increases (to a maximum at 1.5 s)

Then returns / decreases to the original volume

  

1

1

AO3

4.2.2.2
01.2 0.5 (dm3)   1

AO2

4.2.2.2
01.3

5.00 + 0.5

= 5.5 (dm3)

 Accept error carried forward from 01.1

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1

AO2

4.2.2.2
01.4

One cycle = 3 s

Cycles per minute = 60/3

= 20 (cycles)

  

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1

1

AO3

4.2.2.2
01.5

Rib cage moves up and out

Diaphragm contracts and moves down

  

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1

AO1

4.2.2.2
02.1 Lipids / fats   1

AO1

4.2.2.1
02.2 Iodine   1

AO1

4.2.2.1
02.3 Avoid getting on skin / wear gloves / wear safety goggles   1

AO3

4.2.2.1
02.4

No

No

Yes

  

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1

AO3

4.2.2.1
03.1 B   1

AO2

4.2.2.2
03.2

Any one from:

  • Thick walls containing muscles – to withstand high (blood) pressure
  • Elastic fibres – to allow wall to stretch as (high pressure) blood passes through / to recoil / return to shape after blood (pulse / flow) passes

1 mark for feature

1 mark for explanation linked to the feature stated

 2

AO1

4.2.2.2
03.3 Pulmonary artery   1

AO1

4.2.2.2
03.4

Any one from:

  • takes blood from the heart to the lungs
  • transports deoxygenated blood towards lungs
  • transports blood that has provided oxygen to body cells
   1

AO1

4.2.2.2
03.5

Any two from:

  • To provide cell with oxygen / glucose
  • To remove waste products / carbon dioxide / other named waste product
  • To enable respiration to take place
   2

AO1

4.2.2.2
04.1

Left top: trachea

Left bottom: lungs

Right top: bronchiole

Right bottom: alveolus

  

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1

1

1

AO2

4.2.2.2
04.2 Ribcage   1

AO1

4.2.2.2
04.3

Any two from:

  • rich blood supply
  • thin walls
  • spherical shape
  • large surface area
   2

AO1

4.2.2.2
04.4

Any three from:

  • (Intercostal) muscles between ribs contract
  • Ribs move up and out
  • Diaphragm moves down
  • Chest cavity / lung volume increases
  • Pressure in the chest cavity / lung decreases
   3

AO1

4.2.2.2
05.1 an organ system   1

AO1

4.2.1
05.2

A – Liver

C – Small intestine

  

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AO2

4.2.2.1
05.3 Organ D   1

AO2

4.2.2.1
05.4

muscular tissue – churns the food and digestive juices of the stomach together

glandular tissue – produces the digestive juices

epithelial tissue – covers the inside and outside of the stomach

1 mark for one correct match

2 marks for all correctly matched

 2

AO1

4.2.2.1
06 Level 3: Detailed description of the test for all four food groups given that includes named reagents and the positive result. 5–6

AO2

4.2.2.1
 

Level 2: Description of the test for all four food groups given but named reagents or positive results not provided.

OR

Description with named reagents and positive result provided for at least two of the food groups.

 3–4  
  Level 1: Description of test given for at least one food group, but no named reagents or positive results given. 1–2  
  No Relevant content 0  
 

Indicative content

  • Place the food sample into each of the four test tubes.
  • Add a few drops distilled water.
  • Add a few drops of iodine to one sample.
  • If colour change yellow-orange to blue-black starch is present.
  • Add a few drops of Benedict’s solution.
  • Heat tube in water bath (at >60).
  • If colour change blue to brick-red sugar is present / or green if only a small amount of reducing sugars are present.
  • Add a few drops of Biuret reagent.
  • If colour change blue to purple protein is present.
  • Add a few drops of ethanol (and shake).
  • If cloudy layer forms fats are present.
    
07.1

cell – building blocks of life

organism – group of organ systems working together

tissue – group of similar cells working together

organ – group of tissues working together to perform a function

organ system – group of organs working together to perform a function

1 mark for one correct

2 marks for two correct

3 marks for three correct

4 marks for all correct

 4

AO1

4.2.1
07.2 to transport materials around the body in the blood   1

AO1

4.2.1
07.3

liver

stomach

  

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1

AO1

4.2.1
08.1 B   1

AO2

4.2.2.3
08.2

red blood cells – transport oxygen

white blood cells – fight disease

plasma – transports blood cells

platelets – clot the blood

1 mark for one correct

2 marks for two correct

3 marks for all correct

 3

AO1

4.2.2.3
08.3 It is a group of similar cells working together   1

AO2

4.2.2.3
08.4

Any one from:

  • No nucleus
  • biconcave shape
  • contain haemoglobin
   1

AO1

4.2.2.3
09.1

sperm / egg

brain / heart / uterus

blood

nervous system

  

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1

1

AO1

4.2.1
09.2

tissue

organ

organ system

1 mark for one correct

2 marks for all correct

 2

AO1

4.2.1
09.3 A group of similar cells working together   1

AO1

4.2.1
10.1 C   1

AO1

4.2.2.2
10.2

A – vena cava

B – aorta

  

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1

AO1

4.2.2.2
10.3

Valve

Prevents blood flowing backwards into the (right) atrium

  

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AO1

4.2.2.2
10.4

One transport system carries blood from the heart to the lungs (and back) to allow gas exchange

The second system transports blood around the body to enable cells to respire / to transport oxygen / glucose / other materials

  

1

1

AO1

4.2.2.2
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