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The diagram shows what happened in an experiment with plant seedlings.
Which characteristic of living things made the seedlings grow towards the light?
575
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520
Which structure or substance is found in a plant root?
556
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596
The diagram shows an arthropod.
Which group of arthropods does it belong to?
507
520
530
Which structure is present in plant cells but absent from bacterial cells?
570
504
548
Which cell is adapted for swimming?
551
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554
A pollen grain was viewed with a microscope using $\times500$ magnification.
The image size of the pollen grain was measured as $75\,mm$.
Which calculation would give the actual size of the pollen grain in millimetres?
577
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501
Which graph represents the effect of increasing temperature on the rate of diffusion?
533
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529
Which characteristics are correct for both osmosis and diffusion?
[Table_1]
564
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508
Which row describes active transport?
[Table_1]
524
573
586
What is a correct statement about biological molecules?
576
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573
Enzyme X digests starch in the duodenum.
The same volumes of starch suspension and enzyme X were put into four test-tubes, A, B, C and D. Each test-tube was kept at a different pH and temperature, as shown in the table.
In which test-tube will starch digestion be the quickest?
[Table_1]
| Test-tube | pH | Temperature /°C |
|-----------|----|-----------------|
| A | 2 | 20 |
| B | 2 | 35 |
| C | 7 | 20 |
| D | 7 | 35 |
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The diagram represents enzyme action in a chemical reaction.
What are parts W, X and Y in this chemical reaction?
[Table_1]
571
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Aquatic plants were placed in two test-tubes. Each test-tube was sealed to prevent the entry or exit of gases. One test-tube was kept in the light and one test-tube was kept in the dark.
What needs to be added to the test-tubes to detect any differences in gas exchange?
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538
Which part of a leaf contains the highest concentration of chloroplasts?
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560
Which four organs are part of the digestive system?
587
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591
What should be increased in the diet of a person suffering from constipation?
545
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598
The diagram shows part of the small intestine and an associated blood vessel.
What is represented by the arrow?
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The diagram shows the human alimentary canal.
Which labelled part absorbs the most water?
529
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570
Which description of molar teeth is correct?
528
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584
Which organs are involved in physical digestion?
[Table_1]
$$
\begin{array}{|c|c|c|c|}
\hline
& \text{mouth} & \text{oesophagus} & \text{stomach} \\
\hline
\text{A} & \checkmark & \checkmark & \text{x} \\
\text{B} & \checkmark & \text{x} & \checkmark \\
\text{C} & \text{x} & \checkmark & \text{x} \\
\text{D} & \text{x} & \text{x} & \checkmark \\
\hline
\end{array}
$$
key:
$\checkmark$ = yes
$\text{x}$ = no
550
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556
What is produced by the action of lipase on fats?
1 amino acids
2 fatty acids
3 glycerol
525
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525
Where are most nutrients absorbed in the digestive system?
541
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505
The diagrams show a section through a root and a section through a stem.
In which tissues are amino acids transported?
565
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565
Which diagram represents a cell responsible for the transport of oxygen?
587
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599
Transmissible diseases are transmitted when a pathogen is passed from one host to another.
What is an example of direct contact?
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583
The diagram shows the breathing system in humans.
Which labelled part is surrounded by blood capillaries for gas exchange?
548
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518
What are the products of aerobic respiration in plants?
519
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582
The diagram shows some structures associated with human excretion.
Which structure excretes urea?
513
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567
Which organ secretes insulin and how is it transported?
[Table_1]
543
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588
In an experiment, bacteria were grown on agar. Four paper discs, A, B, C and D, were placed on top of the agar. Each paper disc contained a different antibiotic.
The diagram shows the agar after 48 hours. The clear areas show where bacteria are not growing.
Which antibiotic are the bacteria most resistant to?
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The list shows secondary sexual characteristics.
1 Hair grows on the face.
2 Hips become wider.
3 Voice becomes deeper.
Which secondary sexual characteristics are caused by testosterone?
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537
The diagram shows a flower seen from above.
Use the key to find the name of the family to which it belongs.
[Table_1]
511
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571
Which statement about a heterozygous individual is correct?
524
575
589
What is an example of continuous variation?
592
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502
A particular animal species only eats plants.
What is a description of this animal species?
587
532
552
In the carbon cycle, which process uses carbon dioxide?
554
542
560
Which statements about deforestation are correct?
1. Deforestation causes an increase in atmospheric carbon dioxide.
2. Deforestation causes an increase in biodiversity.
3. Deforestation causes an increase in the loss of soil.
561
531
558
Which two gases enhance the greenhouse effect?
534
549
561
Which row shows whether the two natural resources are \textbf{always} managed sustainably?
[Table_1]
530
591
580
Which features make bacteria useful in biotechnology?
[Table_1]
Key:
✓ = feature is useful in biotechnology
✗ = feature is not useful in biotechnology
518
572
600
