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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. Which part of the cell contains genetic information (DNA)?

    Answer: Nucleus

    The nucleus contains the cell's DNA, organised into chromosomes, which carry genetic information for the cell's functions.

  2. What is the function of red blood cells?

    Answer: Carry oxygen

    Red blood cells (erythrocytes) contain haemoglobin, which binds to oxygen in the lungs and carries it to body tissues.

  3. What is the term for organisms that break down dead organic matter?

    Answer: Decomposers

    Decomposers (such as bacteria and fungi) break down dead organisms and waste materials, recycling nutrients back into the ecosystem.

  4. Which vitamin is produced by the skin when exposed to sunlight?

    Answer: Vitamin D

    Vitamin D is synthesised in the skin when it is exposed to ultraviolet B (UVB) radiation from sunlight. It is essential for calcium absorption.

  5. What is the name of the process where plants lose water through their leaves?

    Answer: Transpiration

    Transpiration is the process by which plants lose water vapour through their stomata (pores in leaves). It helps draw water up from the roots.

  6. How many chromosomes do human body cells normally contain?

    Answer: 46

    Normal human body (somatic) cells contain 46 chromosomes arranged in 23 pairs. Gametes (sex cells) contain 23 chromosomes.

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Sources & references

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  1. file.go.gov.sg — Retake policy · verified Nov 2026
  2. seab.gov.sg — Passing score, score release, test delivery, eligibility, fees, registration · verified Nov 2026