No questions found
Students find a small organism in a pond. They catch it and put it into a large jar of water. They see that the organism swims away from light. It lays some eggs before they put it back into the pond.
Which characteristics of living things did the students see in this organism?
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501
The diagram shows how Homo sapiens (modern people) could have evolved from earlier ancestors.
Which statement about modern people and their ancestors is correct?
550
524
513
In cells with a high respiration rate, what would be found in the cytoplasm in increased numbers?
581
532
568
Which features are possessed by all plant cells?
[Table_1]
506
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582
The diagram shows a mitochondrion.
The diagram is 70 mm long.
What is the magnification of the diagram?
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590
The diagram shows a test-tube containing clear jelly. A drop of blue ink is injected into the middle of the jelly.
The blue colour of the ink spreads throughout the jelly.
By which process does the blue ink spread through the jelly?
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Which row describes active transport?
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Which reagent is used when testing a food for vitamin C?
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Small molecules are used as the basic units in the synthesis of large food molecules. Which statement is correct?
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The diagrams show a protease enzyme catalysing the breaking of part of a protein molecule into smaller pieces.
Which diagram has three correct labels?
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The diagram shows an experiment to investigate the balance between respiration and photosynthesis. In which tube are photosynthesis and respiration taking place at the same time?
555
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The diagrams show the structure of four different cells from a plant.
Which cell is from the upper epidermis of a leaf?
578
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The diagram shows the human alimentary canal.
Which pair of structures both produce digestive enzymes?
543
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589
The cholera bacterium produces toxins that cause chloride ions to be secreted into the small intestine. How does this affect the water potential of blood in the intestinal capillaries and the intestinal contents? [Table_1]
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Starch in food is digested in two stages. In which parts of the alimentary canal do the two stages occur? [Table_1]
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543
A celery stalk was placed into a beaker of blue dye. When the dye reached the leaves, the stalk was taken out and a section was cut, as shown in the diagram.
Which diagram shows the appearance of the cut end of the stalk?
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The table shows the rate of water flow through a tree over a 12 hour period.
[Table_1: The table shows time of day vs. rate of flow in cm per hour]
What conclusion can be drawn from the table?
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Scientists investigate the movement of substances in a plant.
They cut a ring of tissue from the stem.
Removing the tissue removes some of the transport vessels found around the edge of the stem.
A few days later they notice swelling above the area where the tissue has been removed.
What causes the swelling?
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The diagram shows cross-sections through three types of blood vessel, not drawn to the same scale.
Which section is from a vein and which is from a capillary?
544
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516
By which route would an HIV infection not be transmissible?
525
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The diagram illustrates changes in air pressure taking place inside the lungs during a complete cycle of breathing. Atmospheric pressure is 101 kPa.
At which point on the diagram are the ribs beginning to be lowered?
537
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Which process uses energy released by respiration?
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The volume of oxygen taken up by germinating seeds was measured. The graph shows the results. What is the rate of oxygen uptake?
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The diagrams show the structures on each side of a synaptic cleft.
Which diagram is correctly labelled?
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Dialysis is a method of regulating the composition of blood when the kidneys are not working properly.
Which substance is absent from fresh dialysis fluid?
509
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The diagram shows a vertical section through part of a human eye. A fly is coming nearer to the eye. The eye begins to focus the image of the fly on its retina.
How do the labelled parts of the diagram change?
520
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509
Where is glucagon secreted, and what is its effect on blood glucose concentration?
[Table_1: secreted by and effect on blood glucose concentration]
514
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Which feature allows the sperm to dissolve the jelly coating of the egg cell?
582
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Parents with alleles $I^A I^B$ and $I^O I^O$ can produce children with which blood groups?
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The diagram shows the chromosomes in the nucleus of a cell that divides by mitosis.
Which diagram shows the chromosomes in the nucleus of one of the daughter cells produced?
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During protein synthesis, what is the function of the ribosome?
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The table shows some inherited features.
Which features show co-dominance?
[Table_1]
blood group | colour blindness | sex
A ✔ | ✔ | ✘
B ✔ | ✘ | ✘
C ✘ | ✔ | ✔
D ✘ | ✔ | ✘
key
✔ = co-dominant
✘ = not co-dominant
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These events may happen when an antibiotic is used to treat a bacterial infection.
1. The antibiotic kills most of the bacteria.
2. The antibiotic resistant bacteria reproduce.
3. The antibiotic resistant bacteria survive.
4. Some bacteria mutate and are resistant to the antibiotic.
Which sequence may produce a strain of antibiotic resistant bacteria?
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The diagram shows the energy within the producers in an ecosystem and how much is transferred to primary consumers and eventually lost to the environment.
How much energy is transferred from primary consumers to secondary consumers?
588
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Which is the tertiary consumer in this food chain?
aquatic plant → pond snails → small fish → large fish → fish eagles
514
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Scientists in one country are using bacteria to break down crude oil in abandoned oil fields. This produces natural gas which is used as a fuel.
Why are bacteria useful in this example of biotechnology?
588
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583
The diagrams show the stages in the production of human insulin.
Which stage uses the enzyme DNA ligase?
545
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542
What is an undesirable effect of deforestation?
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