Page 19 - ACE YR IGCSE A TOP APPROACH TO BIO

6 Fig. 6.1 shows a human red blood cell and a bird red blood cell.

Nucleus

Human red blood cell Bird red blood cell
Fig. 6.1
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(a) State the function of red blood cells.

[1]

(b) State three adaptive features of human red blood cells that aid in their functions.

[3]

(c) A significant difference of the red blood cell between humans and birds is the presence
of nucleus in the red blood cells of birds.
Explain why nucleus is not present in human red blood cells.

[2]
[Total: 6]

7 Fig. 7.1 shows a sketch diagram of a red blood cell. ST shows the diameter of the red blood
cell.

S T
Fig. 7.1

(a) Based on Fig. 7.1, measure and state the length of ST.

[1]

Chapter 2 Organisation of the Organism 17

Chapter 2.indd 17 30/03/2022 3:08 PM