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CIE iGCSE Co-Ordinated Science B15.1 Asexual 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

A certain aquatic plant reproduces by forming offspring from the original plant.

Which statement describes the reproduction of this aquatic plant?

A. asexual reproduction which produces genetically different plants
B. asexual reproduction which produces genetically identical plants
C. sexual reproduction which produces genetically different plants
D. sexual reproduction which produces genetically identical plants

▶️ Answer/Explanation
The plant produces offspring directly from the original plant without the fusion of gametes, indicating asexual reproduction. Since there is no genetic mixing from two parents, the offspring produced are genetically identical to the parent and to each other (clones).
✅ Answer: (B)

Question

Which statements about asexual reproduction are correct?

  1. It involves gametes.
  2. It produces genetically identical offspring.
  3. It only requires one parent.

A. 1, 2 and 3
B. 1 and 2 only
C. 1 and 3 only
D. 2 and 3 only

▶️ Answer/Explanation
Asexual reproduction does NOT involve gametes (statement 1 is false) — it uses mitosis only, so no fertilisation occurs.
Statements 2 and 3 are correct: asexual reproduction requires only one parent and produces offspring that are genetically identical (clones) to the parent.
✅ Answer: (D)

Question

In a plant, what leads to offspring that are genetically identical to the parent?

A. asexual reproduction
B. insect pollination
C. seed germination
D. sexual reproduction

▶️ Answer/Explanation
Asexual reproduction involves only one parent and no fusion of gametes.
Because there is no mixing of genetic material from two parents, the offspring are genetically identical to the parent (clones).
✅ Answer: (A)

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)
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