IGCSE 2020 Biology 0610/21 Oct/Nov

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Questions and Worked Solutions for IGCSE Biology 2020 0610/21 Oct/Nov Paper 2.

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IGCSE 2020 0610/21 Oct/Nov Question Paper (pdf)

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  1. Hedgehogs are mammals. Touching a hedgehog causes it to roll into a ball to protect itself.
    Which characteristics is it displaying?
    A excretion and movement
    B growth and sensitivity
    C movement and growth
    D movement and sensitivity
  2. What are features of the leaves of a plant that is a dicotyledon?
  3. The photomicrograph shows a cell from a type of aquatic plant.
    Which parts labelled on the photomicrograph indicate that this is a plant cell?
  4. The diagram shows an image of a chloroplast. The image is 5 cm long.
    The actual length of the chloroplast is 5 µm.
    What is the magnification of the image?
  5. What are features of osmosis?
  6. The diagram shows apparatus which can be used to demonstrate osmosis
  7. Which substances are made by linking together glucose molecules only?
    A cellulose, glycogen and starch
    B fats, cellulose and proteins
    C proteins, oils and glycogen
    D starch, fats and oils
  8. When bases pair up in the formation of DNA, what is one of the pairings?
  9. The graph shows the effect of pH on the rate of reaction of an enzyme.
  10. The graph shows how enzyme activity is affected by temperature.
    How can the change in activity between 40 °C and 55 °C be explained?
    A Heat has killed the enzyme.
    B The enzyme has been used up.
    C The reactants are moving faster.
    D The substrate is less likely to fit into the active site.

  1. The graph shows how the rate of photosynthesis of a plant changes with light intensity, at three different carbon dioxide concentrations. In each case the temperature is 15 °C.
  2. The diagram shows a section through a leaf.
  3. Which stage of nutrition takes place when food molecules become part of a body cell?
    A absorption
    B assimilation
    C digestion
    D ingestion
  4. What is the definition of chemical digestion?
    A Large insoluble molecules are changed into smaller soluble molecules.
    B Large soluble molecules are changed into smaller soluble molecules.
    C Small insoluble molecules and ions are passed through the wall of the small intestine.
    D Small soluble molecules and ions are passed through the wall of the small intestine.
  5. In which order does water pass through these structures in a plant?
  6. The photomicrograph shows a cross-section through a plant stem.
  7. The table shows some features of blood vessels.
    Which row shows the features of a vein?
  8. Where are valves found that prevent blood from flowing in the wrong direction?
    A capillaries and arteries
    B lungs and veins
    C heart and capillaries
    D heart and veins
  9. The sequence of amino acids in antibodies enables them to complete which function?
    A bind to a specific antigen
    B bind to all pathogens
    C perform phagocytosis
    D confer passive immunity for all diseases
  10. The diagram shows some of the structures in a human lung.
    Where is the carbon dioxide concentration highest?
  11. The list shows some processes that happen in the human body.
    1 water enters cells by osmosis
    2 muscles contract
    3 impulses travel along neurones
    4 oxygen diffuses into cells
    Which of these require energy released by respiration?
  12. The table shows the composition of blood entering and leaving the liver and the kidneys.
    Which row is correct?
  13. Which is the correct sequence of structures through which a nerve impulse passes in a reflex arc?
  14. The diagram shows an eye.
    Which labelled part contains cells that are sensitive to light?
  15. When hormones are secreted, they affect different parts of the body.
    The table shows some features that are affected by four different hormones.
    Which hormone is adrenaline?
  16. When the environment is hot, how do the arterioles in the skin and hair erector muscles react?
  17. The diagram shows one parent Hydra growing and releasing an offspring from the side of its body.
  18. Which row describes self-pollination?
  19. Which feature is only found in the male gamete?
    A acrosome
    B enzymes
    C jelly coat
    D mitochondria
  20. The graph shows how the mass of DNA changes during a mitotic cell division.
    Where on the graph are two cells formed?
  21. What happens during meiosis?
    A A diploid cell divides to form diploid cells.
    B A diploid cell divides to form haploid cells.
    C A haploid cell divides to form diploid cells.
    D A haploid cell divides to form haploid cells.
  22. Red-green colour blindness is a condition that occurs more frequently in men than in women.
    Which statement about this condition is correct?
    A It can pass from father to son.
    B It is a sex-linked characteristic.
    C It shows co-dominance.
    D The gene is on the Y chromosome.
  23. Which statement explains why the allele for sickle-cell anaemia is commonly found in human populations in certain parts of the world?
    A It is transmitted by mosquitoes.
    B It protects people against malaria.
    C It prevents people being bitten by mosquitoes.
    D It increases oxygen transport.
  24. The development of antibiotic resistance in bacteria is an example of which process?
    A evolution by artificial selection
    B evolution by natural selection
    C variation due to genetic engineering
    D variation due to asexual reproduction
  25. The diagram contains information about the number and mass of organisms in a food web.
  26. The diagram shows some of the stages in the nitrogen cycle. Which arrow represents the process of nitrogen fixation?
  27. Which term is used to describe the phase of fastest growth in a population of bacteria?
    A stationary
    B lag
    C exponential
    D sigmoid
  28. Which are reasons why bacteria are often useful in biotechnology?
    1 lack of ethical concerns over their manipulation and growth
    2 they have the same genetic code as all other organisms
    3 their DNA is located in a nucleus that can easily be altered with enzymes
  29. Penicillin is produced in a fermenter by growing the fungus Penicillium. The graph shows how the mass of living Penicillium fungus and the concentration of penicillin changed over time.
  30. The number of Atlantic bluefin tuna fish found in the Atlantic Ocean has significantly decreased in the last 50 years.
    Which method would make the biggest improvement in the conservation of tuna fish stocks?
    A decreasing the size of holes in fishing nets
    B genetic engineering of tuna
    C introducing fishing quotas
    D selective breeding of tuna

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