Biology 5090/21 — October/November 2023

Cambridge O-Level · Theory · worked solutions for every part, with the mark scheme

questions

marks

105

minutes

Topics Coordination and Control · Cell Structure and Organisation · Human Nutrition · Organisms and Their Environment · Inheritance · Transport in Humans · +5 more

Q18MTransport in HumansCell Structure and OrganisationHuman NutritionFree sample

(a)

Human blood has many different components and functions.
Match each component to its function by drawing a line between them. One has been done for you.

Fig. 1.1

(b)

(i)

Explain how a red blood cell is specialised for transporting oxygen.

(ii)

The number of red blood cells in $1\,\text{mm}^3$ of blood is called a red blood cell count.
A normal red blood cell count for a female is $4.2\text{–}5.4\text{ million}$ cells in $1\,\text{mm}^3$ of blood.
Suggest two factors that could lead to a change in the red blood cell count in a 25 year-old female.

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The rest of this paper

7 more questions

Q2Sexual Reproduction in Plants · Organisms and Their Environment · Coordination and Control15M
Q3Biological Molecules · Movement Into and Out of Cells12M
Q4Coordination and Control · Disease and Immunity · Inheritance10M
Q5Human Nutrition · Coordination and Control11M
Q6Inheritance · Cell Structure and Organisation9M
Q7Respiration5M
Q8Organisms and Their Environment10M

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