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CIE iGCSE Co-Ordinated Science B17.2 Selection Exam Style Questions Paper 1

CIE iGCSE Co-Ordinated Science Paper 1 - All Chapters

Question

Three stages involved in the selective breeding of wheat to increase the size of the seeds are shown.

  1. crossing wheat plants to produce the next generation
  2. selection by humans of wheat with large seeds
  3. selection of wheat offspring with large seeds

What is the correct sequence of these stages?

A. \(1 \to 2 \to 3\)
B. \(2 \to 1 \to 3\)
C. \(2 \to 3 \to 1\)
D. \(3 \to 1 \to 2\)

▶️ Answer/Explanation
Selective breeding begins with humans selecting parent plants that show the desired trait (large seeds). These selected parents are then crossed to produce the next generation. Finally, offspring that exhibit the desired trait are selected to continue the breeding process. Therefore, the correct sequence is 2 → 1 → 3.
✅ Answer: (B)

Question

A list of the stages of a process is shown.

  1. Choose animals with the desired characteristics.
  2. Breed the animals together.
  3. Choose the offspring with the desired characteristics and breed the offspring.
  4. Repeat over many generations.

What is this process called?

A. asexual reproduction
B. artificial selection
C. mutation
D. natural selection

▶️ Answer/Explanation
The process described is selective breeding (artificial selection). Humans choose individuals with desirable traits, breed them, and continue selecting the best offspring over many generations to enhance those traits. Natural selection occurs without human intervention, and mutation is a random change in genes.
✅ Answer: (B)

Question

Selection in chickens has produced individuals that lay more eggs per week.

What is required for this to occur?

▶️ Answer/Explanation
Chickens reproduce sexually, so the offspring show genetic variation for farmers to choose from.
Farmers then deliberately breed together the hens that lay the most eggs — this is selective breeding, driven by human selection rather than natural selection.
Repeating this over generations increases the egg-laying trait in the population.
✅ Answer: (C)

Question 

Natural selection involves several stages.
1. passing on alleles to the next generation
2. struggle for survival
3. competition for resources
4. production of many offspring
What is the correct order of these stages?
A \( 4 \to 1 \to 2 \to 3 \)
B \( 4 \to 3 \to 2 \to 1 \)
C \( 1 \to 2 \to 3 \to 4 \)
D \( 3 \to 2 \to 1 \to 4 \)

▶Answer/Explanation

Answer: B
Explanation: The correct order of stages in natural selection is:
1. Production of many offspring (4)
2. Competition for resources (3)
3. Struggle for survival (2)
4. Passing on alleles to the next generation (1)
This sequence reflects the process of natural selection, where organisms produce many offspring, compete for limited resources, struggle to survive, and those with advantageous traits pass on their alleles to the next generation.

Question

Selective breeding is used to improve crop plants. What does it involve?

A. artificial selection

B. asexual reproduction

C. ionising radiation

D. natural selection

▶️Answer/Explanation

Answer: A. artificial selection

Explanation: Selective breeding involves the intentional selection of plants or animals with desirable traits to produce offspring with those traits. This process is also known as artificial selection, as it is controlled by humans rather than occurring naturally.

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