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CAIE IGCSE Biology 9.4 Blood Question Bank

Practise blood questions on plasma, red cells, white cells and platelets, linking diagrams and tables to transport, defence and clotting functions.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • match plasma, red blood cells, white blood cells and platelets to their functions
  • compare red cells, lymphocytes and phagocytes from appearance and defence roles
  • describe clotting as platelets triggering fibrinogen to fibrin mesh formation

Covered syllabus points

9.4.1—Components of blood9.4.2—Red and white blood cells9.4.3—Functions of the following components9.4.4—Roles of blood clotting as preventing9.4.5—Lymphocytes and phagocytes9.4.6—Functions of: (a) lymphocytes –9.4.7—Process of clotting as the conversion

9.4 Blood question 1

[Maximum number: 1]

Tissue plasminogen activators (TPAs) are human proteins that are used as drugs to break down blood clots.

TPAs break down blood clots by activating plasminogen. Plasminogen is a protein that is always present in the blood.

When activated, plasminogen forms a protease that breaks down fibrin molecules.

Plasminogen is found in the plasma.

State what is meant by the term plasma.

9.4 Blood question 2

[Maximum number: 1]

Fig. 3.1 is a diagram of alveoli and associated blood vessels.

Fig. 3.1

Fig. 3.1

State the name of the component of blood that transports oxygen.

9.4 Blood question 3

[Maximum number: 7]

Fig. 6.1 is a photomicrograph of a blood clot.

Fig. 6.1

Fig. 6.1

Question (a)

(a)

Describe how a blood clot forms.

Use the letters in Fig. 6.1 in your answer.

[ 5 ]

Question (b)

(b)

State the importance of blood clotting.

[ 2 ]
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