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Course: AQA A Level Biology 7402
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AQA A Level Biology 7402

1. Biological Molecules

0/102

2. Cell Structure

0/95

3. Exchange and Transport

0/98

4. Genetics, Variation and Interdependence

0/94

5. Energy Transfers In and Between Organisms (A Level only)

0/63

6. Organisms Respond to Changes in their Environments (A Level only)

0/93

7. Genetics, Populations, Evolution and Ecosystems (A Level only)

0/55

8. The Control of Gene Expression (A Level only)

0/72

9. Exam Guidance and Skills

0/38
Quiz

3.6.4 The Mass Flow Hypothesis – Unit exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.

The oxygen dissociation curve is sigmoid because

haemoglobin has one haem group
oxygen is insoluble
carbon dioxide blocks binding
binding of the first oxygen molecule makes it easier for the next to bind
2.

During exercise, heart rate increases because

the vagus nerve is stimulated
the cardiovascular control centre sends impulses along the sympathetic nerve to the SAN
CO₂ falls
blood pH rises
3.
Water loss of animals in dry air is shown. What explains the insect's low loss?
It has no body fluids
Its waxy exoskeleton prevents water loss on land
It lives only in water
It lacks segments
4.

Tissue fluid is formed when

osmosis pulls water out
lymph leaks
red cells burst
high hydrostatic pressure at the arterial end of a capillary forces plasma out
5.
IGCSE Biology 9.2 Heart - Question 12
IGCSE Biology 9.2 Heart - Question 12
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B
C
D
6.
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 10
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 10
A
B
C
D
7.
Which is NOT a feature of an efficient gas exchange surface?
Large surface area
Thin walls
Good blood supply
Thick layer of cells
8.
IGCSE Biology 7.4 Chemical Digestion - Question 1
IGCSE Biology 7.4 Chemical Digestion - Question 1
A
B
C
D
9.
IGCSE Biology 9.2 Heart - Question 7
IGCSE Biology 9.2 Heart - Question 7
A
B
C
D
10.
Which statement best describes Oxygen dissociation curve?
Fluid forced out of capillaries that bathes cells.
Graph of percentage saturation of haemoglobin against partial pressure of oxygen.
Tendency of water to move into blood due to plasma proteins.
Haemoglobin combined with oxygen.
11.
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 1
IGCSE Biology 11.1 Gas exchange in humans WITH ALVEOLI - Question 1
A
B
C
D
12.
IGCSE Biology 8.3 Transpiration - Question 15
IGCSE Biology 8.3 Transpiration - Question 15
A
B
C
D
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Part of 3. Exchange and Transport — see every lesson and quiz in this unit.
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