Question
Fig. 4.1 is a diagram of the human female reproductive system.
(a) Complete Table 4.1 to show the letter and the name of each of the structures that perform
these functions.
(b) Fertilization is the fusion of the nuclei of a male gamete and a female gamete resulting in a
zygote.
State the number of chromosomes present in a human:
female gamete
zygote
(c) Chlamydia is a sexually transmitted infection (STI).
Fig. 4.2 shows the number of reported cases of chlamydia in females in each age group in
one country
Describe the results shown by the data in Fig. 4.2.
(d) Chlamydia is caused by a bacterium.
(i) Suggest a treatment for chlamydia. [1]
(ii) State the name of one other STI [1]
(iii) 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]
[Total: 14]
Answer/Explanation
Ans
4 (a) 
4 (b) 23 ;
46 / 23 pairs ;
4 (c) 1 cases increases then decrease ;
2 large increase between 10–14 and 15–19 ;
3 most cases in the 15–19 age group ;
4 from 15–19 number of cases decrease / from 20–24 number of cases steep
decrease ;
5 no cases above 55 years old / in 55–64 age group / 65+ age group ;
6 data quote with number of cases and age group ;
4 (d) (i) antibiotics ;
4 (d) (ii) HIV ;
4 (d) (iii) (named) bodily fluids / sexual fluid ;
barrier ;
condom / femidom ;