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CIE iGCSE Co-Ordinated Science B15.2 Sexual reproduction Exam Style Questions Paper 1

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Question

Which statement about reproduction is correct?

A. Sexual reproduction involves the fusion of two gamete nuclei.
B. Sexual reproduction results in the production of genetically identical offspring.
C. Asexual reproduction involves the fusion of two gamete nuclei.
D. Asexual reproduction results in the production of genetically different offspring.

▶️ Answer/Explanation
Sexual reproduction involves the fusion of two gamete nuclei (fertilisation) to form a zygote. This process produces offspring that are genetically different from each other. Asexual reproduction involves only one parent and produces genetically identical offspring without the fusion of gametes. Therefore, option A correctly describes sexual reproduction.
✅ Answer: (A)

Question

Which row describes sexual reproduction?

▶️ Answer/Explanation
Sexual reproduction involves the fusion of male and female gametes to form a zygote. The offspring are genetically different from each other and from the parents due to the combination of genetic material from two parents. Asexual reproduction produces genetically identical offspring. Thus, zygote produced = yes, genetically identical offspring = no.
✅ Answer: (B)

Question

Which row is correct for sexual reproduction?

▶️ Answer/Explanation
Sexual reproduction requires the fusion of two gametes (fertilisation) and results in genetic variation in offspring, because each gamete carries a unique combination of alleles.
Row C correctly identifies that sexual reproduction involves two parents, fusion of gametes, and genetically varied offspring.
✅ Answer: (C)

Question

Aphids are insects. The information shown describes part of the lifecycle of the aphid.

stage 1 In the spring, wingless females reproduce without fertilisation to produce many female offspring.
stage 2 In late summer, both males and females are produced. The female’s eggs are fertilised by the male’s sperm.

Which row shows the type of reproduction occurring at stages 1 and 2?

▶️ Answer/Explanation
Stage 1 involves reproduction “without fertilisation”, which is the definition of asexual reproduction.
Stage 2 involves fusion of sperm and egg (“fertilised”), which is the definition of sexual reproduction.
✅ Answer: (B)

Question

What is produced by the fusion of the nuclei of two gametes?

A. embryo

B. fetus

C. ovum

D. zygote

▶️Answer/Explanation

Answer: D. zygote

Explanation: The fusion of the nuclei of two gametes (sperm and egg) during fertilization produces a zygote, which is the first cell of a new organism.

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