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ACSEE (Form 6) Biology — practice by topic

Browse 64 questions across 12 Biology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Biology topics

Coordination (13)Cytology (12)Organic Evolution (6)Ecology (5)Gaseous Exchange and Respiration (5)Genetics (5)Principles of Classification (5)Nutrition (4)Regulation (Homeostasis) (3)Reproduction (3)Growth and Development (2)Transportation (1)

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A mitochondrion is described as a cell within a cell mainly because it:Read the answer and worked solution →How many membranes enclose a mitochondrion?Read the answer and worked solution →A specimen 2 cm long is drawn 6 cm long. The magnification of the drawing is:Read the answer and worked solution →Recording observations as a biological drawing is done mainly to:Read the answer and worked solution →

Worked practice questions

A mitochondrion is described as a cell within a cell mainly because it:

  1. contains a Golgi apparatus inside
  2. carries its own DNA and ribosomes
  3. is enclosed by three separate layers
  4. holds a nucleus and cytoplasm
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Correct answer: B. carries its own DNA and ribosomes

1. The claim rests on the mitochondrion having the machinery a cell needs to run itself. 2. It carries its own circular DNA and its own ribosomes, so it makes some of its own proteins. 3. It is bounded by a double membrane, matching a cell's own boundary. 4. It has no nucleus, no Golgi apparatus and no cytoplasm — those belong to the cell around it. 5. Naming a nucleus or cytoplasm is the common slip, and drawing three layers instead of two is the matching drawing error. _Source: NECTA ACSEE 2023 Biology 133/1, Question 1: Cytology_

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How many membranes enclose a mitochondrion?

  1. Two membranes
  2. One membrane
  3. Three membranes
  4. Four membranes
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Correct answer: A. Two membranes

1. A mitochondrion is bounded by a double membrane. 2. The outer membrane is smooth and forms the boundary. 3. The inner membrane folds inwards to form the cristae, which carry the respiratory enzymes. 4. The space enclosed by the inner membrane is the matrix. 5. Drawing three layers instead of two is a frequent error in the diagram. _Source: NECTA ACSEE 2023 Biology 133/1, Question 1: Cytology_

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A specimen 2 cm long is drawn 6 cm long. The magnification of the drawing is:

  1. ×4
  2. ×12
  3. ×0.33
  4. ×3
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Correct answer: D. ×3

1. Magnification = linear dimension of the drawing ÷ linear dimension of the specimen. 2. The drawing measures 6 cm and the specimen 2 cm. 3. So magnification = 6 ÷ 2 = 3, written ×3. 4. Multiplying the two lengths instead gives 12, a common wrong formula. 5. Dividing the specimen by the drawing inverts the ratio and gives 0.33, which would mean the drawing is smaller than the specimen. _Source: NECTA ACSEE 2023 Biology 133/1, Question 4: Cytology_

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