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CAIE IGCSE Biology 16.6 Sexually Transmitted Infections Questions

Practise defining STIs, tracing HIV transmission and effects, and selecting evidence-based methods that limit infection spread.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • identify HIV as a named sexually transmitted infection
  • state that HIV infection may lead to AIDS
  • distinguish HIV routes through sexual fluids, blood, needles or mother-to-fetus transfer from saliva
  • select barrier methods, screening, tracing, education, treatment or vaccination to control STI spread
  • reduce mother-to-infant HIV transmission using medication, breastfeeding decisions or caesarean delivery

Covered syllabus points

16.6.1—Sexually transmitted infection (STI)16.6.2—Human immunodeficiency virus (HIV) is16.6.3—HIV infection may lead to AIDS16.6.4—Methods of transmission of HIV16.6.5—Spread of STIs is controlled

Question 1

[Maximum number: 4]

Fig. 4.1 is a diagram of the human female reproductive system.

Fig. 4.1

Fig. 4.1

Question (a)

(a)

Chlamydia is caused by a bacterium.

[ 4 ]

Question (i)

(i)

State the name of one other STI.

[ 1 ]

Question (ii)

(ii)

Complete the sentences about the spread of STIs.

STIs are transmitted through the transfer of ...... during sexual contact. One way individuals can avoid the spread of STIs is to use a type of ...... contraception. One example of this type of contraception is ......

[ 3 ]

Question 2

[Maximum number: 1]

Which disease is caused by a virus?

A

AIDS

B

kwashiorkor

C

cholera

D

MRSA infection

Question 3

[Maximum number: 4]

Fig. 4.1 is a diagram of a virus.

Fig. 4.1

Fig. 4.1

The human immunodeficiency virus (HIV) infects and destroys lymphocytes.

The number of lymphocytes in the blood of a person infected with HIV was measured over a period of 84 months.

The results are shown in Fig. 4.2.

number of lymphocytes per mm3\mathrm{mm}^{3} of blood

Fig. 4.2

Fig. 4.2

Outline the consequences of the changes in the number of lymphocytes for the health of the person infected with HIV.

Question 4

[Maximum number: 1]

Fig. 4.1 is a diagram of the human female reproductive system.

Fig. 4.1

Fig. 4.1

Chlamydia is caused by a bacterium.

State the name of one other STI.

Question 5

[Maximum number: 2]

Pregnancy can occur after the fusion of a male gamete and a female gamete.

Drug X can be injected into the body. This is one way that HIV can be transmitted.

Describe two other ways that HIV can be transmitted.

1
2

Question 6

[Maximum number: 2]

Syphilis is a sexually transmitted infection (STI) that can be passed from a mother to her fetus.

State two ways to control the spread of STIs.

1
2

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