CIE iGCSE Co-Ordinated Science B15.4 Sexual reproduction in humans Exam Style Questions Paper 4
Question
(a) Fig. 1.1 is a diagram of the female reproductive system in humans
State which letter in Fig. 1.1 identifies where:
meiosis occurs ……………..
fertilisation occurs ……………..
implantation occurs. ……………..
(b) Fig. 1.2 is a diagram showing some of the processes involved in the formation of a human embryo.
(i) State the number and describe the arrangement of chromosomes in cell Z in Fig. 1.2.
number of chromosomes ……………………………………..
arrangement of chromosomes ………………………………..
(ii) State the sex chromosomes in human females.
(iii) State the name of the adaptive feature of egg cells that changes after fertilisation to prevent entry of more than one sperm.
(c) State one function of the amniotic fluid.
(d) Tick (✓) all the boxes that show correct statements about the placenta.
▶️Answer/Explanation
Ans :
1(a) B ;
A ;
E ;
1(b)(i) 46 chromosomes ;
arranged in pairs ;
1(b)(ii) XX ;
1(b)(iii) jelly coat ;
1(c) shock absorber / protection (from mechanical harm/infection of fetus) / stabilises temperature ;
1(d) 