CIE iGCSE Co-Ordinated Science B15.4 Sexual reproduction in humans Exam Style Questions Paper 2
▶️ Answer/Explanation
The scrotum is the sac of skin that holds the testes outside the main body cavity.
This keeps the testes slightly cooler than body temperature, which is necessary for healthy sperm production.
The other rows mismatch structure and function (e.g. the prostate adds fluid rather than transferring sperm, and the urethra carries semen out of the penis, not to the ovary).
✅ Answer: (B)
This keeps the testes slightly cooler than body temperature, which is necessary for healthy sperm production.
The other rows mismatch structure and function (e.g. the prostate adds fluid rather than transferring sperm, and the urethra carries semen out of the penis, not to the ovary).
✅ Answer: (B)
▶️ Answer/Explanation
Male gametes (sperm) are made in the testes, structure V.
Female gametes (eggs) are made in the ovary, structure W.
Fertilisation, structure Z, occurs in the oviduct (fallopian tube).
✅ Answer: (C)
Female gametes (eggs) are made in the ovary, structure W.
Fertilisation, structure Z, occurs in the oviduct (fallopian tube).
✅ Answer: (C)
▶️ Answer/Explanation
The placenta allows the exchange of substances such as oxygen, nutrients, and carbon dioxide between the mother’s blood and the fetus’s blood by diffusion, without the two blood supplies actually mixing.
It also acts as a barrier, blocking many (though not all) harmful substances and pathogens from reaching the fetus.
It does not cushion the fetus (that is the role of amniotic fluid) or maintain temperature, so the barrier function is the correct answer.
✅ Answer: (A)
It also acts as a barrier, blocking many (though not all) harmful substances and pathogens from reaching the fetus.
It does not cushion the fetus (that is the role of amniotic fluid) or maintain temperature, so the barrier function is the correct answer.
✅ Answer: (A)
▶️ Answer/Explanation
Sperm cells contain enzymes in the acrosome (head) to help penetrate the egg’s membrane at fertilisation.
They also have a flagellum (tail) that allows them to swim towards the egg; food stores and a jelly coating are features of egg cells, not sperm.
✅ Answer: (B)
They also have a flagellum (tail) that allows them to swim towards the egg; food stores and a jelly coating are features of egg cells, not sperm.
✅ Answer: (B)
▶️ Answer/Explanation
The oviduct (also called the Fallopian tube) is the tube that connects the ovary to the uterus. In the diagram, label 1 points to this structure. Label 2 points to the ovary, label 3 to the uterus, and label 4 to the cervix.
✅ Answer: (A)
✅ Answer: (A)