IGCSE 2021 Biology 0610/21 May/June

IGCSE 2021 0610/21 May/June Question Paper (pdf)

IGCSE 2021 0610/21 May/June Mark Scheme (pdf)

• Show Video with Step-by-Step Solutions Q1 - 20

• Show Video with Step-by-Step Solutions Q21 - 40

1. What is a characteristic of all living organisms?
   A breathing
   B circulation
   C egestion
   D sensitivity
2. The table shows a section of DNA taken from four different organisms.
   Which two organisms are the most distantly related to each other?
3. Scientists discover a new species of animal.
   It has a segmented body with two pairs of legs on each segment.
   To which group of animals does this new species belong?
   A arachnids
   B crustaceans
   C insects
   D myriapods
4. The diagram shows a single-celled organism called Euglena.
   Which labelled structures would also be found in an animal cell?
   A cell membrane, chloroplast, nucleus
   B chloroplast, cytoplasm, nucleus
   C cell membrane, cytoplasm, nucleus
   D cell membrane, cytoplasm, large permanent vacuole
5. The diagram shows some of the blood vessels and other structures in the human body.
   The blood vessels shown are all parts of the same
   A cell.
   B organ.
   C organ system.
   D tissue
6. A photograph shows a plant cell nucleus measuring 2 mm across.
   If the magnification of the cell is ×500, what is the actual size of the nucleus?
7. By which process do oxygen and carbon dioxide move between cells and capillaries?
   A breathing
   B diffusion
   C excretion
   D respiration
8. Which process is involved in the uptake of glucose by the epithelial cells of kidney tubules?
   A active transport
   B osmosis
   C translocation
   D transpiration
9. Which element is found in proteins but not carbohydrates?
   A carbon
   B hydrogen
   C nitrogen
   D oxygen
10. The diagram shows a short section of a single strand of DNA.
    Which strand of DNA will combine with this strand to form part of a double helix?

11. Starch is digested by amylase in the mouth, but it is not digested in the stomach.
    What is the reason for this?
    A All starch digestion is completed in the mouth.
    B The pH in the stomach is not suitable for the amylase to work.
    C The starch does not stay in the stomach long enough to be digested.
    D The temperature in the stomach is not suitable for the amylase to work
12. Which statement describes a catalyst?
    A a substance that decreases the rate of a chemical reaction and is not changed by the reaction
    B a substance that decreases the rate of a chemical reaction and is changed by the reaction
    C a substance that increases the rate of a chemical reaction and is changed by the reaction
    D a substance that increases the rate of a chemical reaction and is not changed by the reaction
13. A plant with striped leaves was kept in bright light for six hours.
    A leaf was taken from the plant and the chlorophyll was removed. The leaf was then tested for starch using iodine solution.
    Which diagram shows the result of the test?
14. The graph shows daily carbon dioxide uptake and transpiration by the plant Agave americana.
    The plant is adapted to live in very dry conditions.
    What can be concluded from this graph?
    A More stomata are closed during dark periods.
    B More stomata are closed during light periods.
    C There is no carbon dioxide uptake during dark periods.
    D There is no water uptake during light periods.
15. Statements 1 to 4 describe stages in the development of cholera.
16. What are the products when proteins are broken down?
    A amino acids
    B fatty acids
    C glycerol
    D simple sugars
17. The diagram shows part of a cross-section of a root
18. The diagram shows an onion plant that has been grown from a seed. Each onion plant takes two years to flower and produce more seeds.
19. What are the main vessels carrying blood to and from the kidney?
20. The photomicrograph shows human blood.
    Which blood component makes antibodies?
21. A child is vaccinated against measles. After a period of time the child is infected with the measles virus.
    The graph shows the concentration of measles antibodies in the child’s bloodstream during this time.
    Which statement is consistent with the information in the graph?
    A After the vaccination, the child produced memory cells.
    B The child had passive immunity against measles.
    C The measles virus contains antibodies.
    D The vaccination failed to protect the child against measles
22. Which sequence of changes takes place when we breathe in?
23. The list shows some processes that take place in a human body.
24. Which equation is aerobic respiration?
25. Which statement about urea is correct?
    A Urea is formed from excess amino acids in the kidneys and excreted by the liver.
    B Urea is formed from excess glucose in the liver and egested by the kidneys.
    C Urea is formed from excess glucose in the kidneys and egested by the liver.
    D Urea is formed from excess amino acids in the liver and excreted by the kidneys.
26. The diagram shows the appearance of an eye when in bright light.
27. What is the effect of adrenaline on pulse rate and blood glucose concentration?
28. Which statements about auxin are correct?
29. Scientists carried out a survey on the effect of giving up smoking on the risk of developing lung cancer. The results are shown in the graph.
30. A zygote has ten chromosomes in its nucleus. Which row shows the number of chromosomes in the cells of this species?
31. How will the composition of a pregnant woman’s blood change as it passes through the placenta?
32. What carries a copy of the gene to the cytoplasm to make a protein?
    A alleles
    B DNA molecules
    C ribosomes
    D mRNA molecules
33. Which statement about meiosis is correct?
    A Daughter cells are genetically identical.
    B The chromosome number changes from haploid to diploid.
    C It is used to produce body cells.
    D It allows the formation of new combinations of chromosomes.
34. Colour blindness is a characteristic that is sex-linked.
    Which statement about colour blindness is correct?
    A The gene for colour blindness is located on the Y chromosome and colour blindness is more common in males than in females.
    B The gene for colour blindness is located on the X chromosome and colour blindness is more common in males than in females.
    C The gene for colour blindness is located on the X chromosome and colour blindness is more common in females than in males.
    D The gene for colour blindness is located on the Y chromosome and colour blindness is more common in females than in males.
35. The graph shows the percentage of different blood groups in a human population.
    Which type of variation is shown by human blood groups?
    A continuous variation caused by genetic and environmental factors
    B continuous variation caused by genetic factors only
    C discontinuous variation caused by genetic and environmental factors
    D discontinuous variation caused by genetic factors only
36. New strains of the crop plant wheat can be produced by cross-breeding disease resistant plants with those that give high yields of grain.
    What is this an example of?
37. The diagram shows the flow of energy.
38. The diagram shows the feeding relationships in a food web.
39. Why are bacteria useful in genetic engineering?
40. Which hormones can cause the feminisation of male fish?
    A adrenaline and progesterone
    B adrenaline and testosterone
    C oestrogen and progesterone
    D oestrogen and testosterone

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