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ACSEE (Form 6) Organic Evolution — practice questions

Explore 6 free Organic Evolution questions in ACSEE (Form 6) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Organic Evolution questions and exercises with answers

Showing questions 1–6 of 6.

A biologist finds near-identical embryos in a fish and a chicken. This kind of finding counts as:Read the answer and worked solution →A mountain range rises and splits one population into two that can no longer meet. This is:Read the answer and worked solution →The theory of natural selection was proposed by:Read the answer and worked solution →Catch the evidence for evolutionRead the answer and worked solution →Fault the false isolation claimsRead the answer and worked solution →Group the isolation typesRead the answer and worked solution →

Worked practice questions

A biologist finds near-identical embryos in a fish and a chicken. This kind of finding counts as:

  1. evidence for common ancestry
  2. features of natural selection
  3. mechanisms of reproductive isolation
  4. types of directional selection
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Correct answer: A. evidence for common ancestry

1. Natural selection describes how populations change: variation, overproduction, competition, survival of the fitter, inheritance. 2. Comparative embryology and biochemistry do not describe that process at all. 3. Instead they show that different species share ancestry — similar embryos, similar molecules. 4. So they are evidence for evolution having occurred, not part of its mechanism. 5. Offering them as features of natural selection was a recorded error; so was offering stabilising, disruptive and directional, which are types of selection. _Source: NECTA ACSEE 2023 Biology 133/2, Question 5: Organic Evolution_

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A mountain range rises and splits one population into two that can no longer meet. This is:

  1. geographical isolation
  2. reproductive isolation
  3. genetic isolation
  4. behavioural isolation
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Correct answer: A. geographical isolation

1. Speciation begins when gene flow between groups is cut off. 2. Geographical isolation is a physical barrier — a mountain, a river, an ocean — separating the groups. 3. Reproductive isolation instead means the groups can meet but cannot successfully breed. 4. Genetic isolation arises from chromosomal or genetic changes that block interbreeding. 5. Here the barrier is a landform, so the isolation is geographical, and the separated populations then diverge under their own selection pressures. _Source: NECTA ACSEE 2023 Biology 133/2, Question 5: Organic Evolution_

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The theory of natural selection was proposed by:

  1. Lamarck and Mendel
  2. Watson and Crick
  3. Darwin and Wallace
  4. Linnaeus and Hooke
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Correct answer: C. Darwin and Wallace

1. Natural selection was put forward jointly by Charles Darwin and Alfred Russel Wallace. 2. Lamarck proposed a different and now rejected mechanism, the inheritance of acquired characteristics. 3. Mendel established the laws of inheritance, which explain how variation is passed on. 4. Watson and Crick described the structure of DNA, and Linnaeus devised binomial nomenclature. _Source: NECTA ACSEE 2023 Biology 133/2, Question 5: Organic Evolution_

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