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Combined Science — Biology Flashcards

6 cards from real O-LEVEL practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Combined Science — Biology flashcards as text

  1. What is the function of the diaphragm in breathing?

    Answer: Contracts and relaxes to change chest volume

    The diaphragm is a dome-shaped muscle. When it contracts, it flattens and increases chest volume, causing air to rush into the lungs (inhalation).

  2. What are the products of anaerobic respiration in yeast?

    Answer: Ethanol and carbon dioxide

    In yeast, anaerobic respiration produces ethanol (alcohol) and carbon dioxide. This process is used in brewing and bread-making.

  3. What is the term for the physical appearance of an organism resulting from its genetic makeup?

    Answer: Phenotype

    Phenotype refers to the observable physical characteristics of an organism (e.g., eye colour, height) that result from both its genotype and environmental factors.

  4. Which part of the neuron carries impulses towards the cell body?

    Answer: Dendrite

    Dendrites are short, branched extensions of a neuron that carry electrical impulses towards the cell body. Axons carry impulses away.

  5. What is the main function of the large intestine?

    Answer: Absorbing water from undigested food

    The main function of the large intestine (colon) is to absorb water from undigested food material, forming solid faeces for excretion.

  6. What is an antibody?

    Answer: A protein produced by white blood cells to neutralise specific antigens

    Antibodies are Y-shaped proteins produced by B-lymphocytes (white blood cells) in response to specific antigens, binding to and neutralising pathogens.

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  1. file.go.gov.sg — Retake policy · verified Nov 2026
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