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Some processes carried out by living organisms are listed.
1. egestion
2. excretion
3. reproduction
4. respiration
Which processes are carried out by all living organisms?
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The scientific name for humans is *Homo sapiens*. What does *Homo* refer to?
501
564
550
Which row is correct for arthropod classification? [Table_1]
598
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542
In a mesophyll cell, where are chloroplasts found?
539
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The cell shown in the diagram has been magnified 3000 times. The diagram is 21 mm wide. What is the actual diameter of the cell?
509
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556
The diagrams show how a cell appears under the microscope at the start of an experiment and after it has been placed in a dilute solution of salts for 5 minutes. Which statement explains what happens?
506
594
501
What causes the diffusion of oxygen into a plant cell?
556
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What is the colour change shown by Benedict's solution when heated with a reducing sugar?
545
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The diagram shows the digestive system. Which part absorbs the most water?
577
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511
The graph shows the effect of temperature on the activity of four different enzymes. Which conclusion about the data in the graph is correct?
596
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527
Which colour does hydrogencarbonate indicator turn if the carbon dioxide concentration is increased?
560
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589
The diagram shows a test-tube at the start and at the end of an enzyme experiment. At the end of the experiment, the mixture in the test-tube contains glycerol. Which row correctly identifies the enzyme and the substrate it acts on? [Table_1]
555
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535
The diagram shows the teeth in the lower jaw of a human. Which tooth is a molar?
550
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503
What is meant by chemical digestion?
599
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515
Which food is a good source of vitamin C?
553
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556
What is a description of transpiration?
511
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503
Parts of a plant are listed.
1. mesophyll cells
2. root cortex cells
3. root hair cells
4. xylem vessels
What is the pathway taken by water in the plant?
514
529
533
Parts of the human circulatory system are listed.
1. arteries
2. capillaries
3. heart
4. veins
Which structures have valves to ensure the one-way flow of blood?
557
557
512
Which type of cells produce antibodies?
537
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583
What is an example of a transmissible disease?
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Which table correctly shows the difference in composition of inspired air compared with expired air?
534
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516
What is the site of gas exchange in humans?
506
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540
Three statements about anaerobic respiration are listed.
1. In humans, the product is lactic acid.
2. In yeast, the product is lactic acid.
3. It releases more energy per glucose molecule than aerobic respiration.
Which statements are correct?
502
502
599
Which organ produces insulin?
600
596
554
The diagram shows the human excretory system. Which labelled structure is the urethra?
559
533
521
The diagrams show three types of neurones.
Which sequence shows the direction that impulses will travel during a reflex action?
579
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500
Which part of the eye detects red light?
543
531
533
The diagram shows a human sperm cell.
Which structure digests the egg cell membrane?
563
576
596
Which diseases can be successfully treated with antibiotics? [Table_1] Table: | | diseases caused by bacteria | rickets | diseases caused by viruses | |----------|-----------------------------|---------|----------------------------| | **A** | ✓ | ✓ | ✓ | | **B** | ✓ | x | x | | **C** | x | ✓ | x | | **D** | x | x | ✓ | Key: - ✓ = can be treated - x = cannot be treated
521
555
506
Some species of plants can reproduce by producing bulbs. The diagram shows a bulb.
The bulb is produced by one parent plant and will grow into a new plant. Which statement about the new plant is correct?
588
562
539
Which diagram of the male reproductive system is correctly labelled?
547
528
600
What can be used to reduce the transmission of HIV? [Table_1]
598
583
504
Which statement about the human sex chromosomes is correct?
534
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568
The inheritance of seed colour in pea plants is controlled by a single gene. The allele for yellow seed colour, Y, is dominant. The allele for green seed colour, y, is recessive. What are the possible genotypes of a pea seed that is yellow?
577
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536
The graph shows the heights of students in a class. What is a correct statement for these data?
504
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566
Which process decreases the amount of carbon dioxide in the atmosphere?
520
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It is estimated that 90\% of the energy which flows through living organisms in a food chain is lost between one trophic level and the next. The producers in a food chain contain 1000 units of energy. How many units will reach the quaternary consumers in the food chain?
542
529
546
What can increase as a result of deforestation? 1. extinctions 2. flooding 3. biodiversity
538
576
584
The diagram shows the position of a farmer's field near a river. The farmer uses chemical fertilisers that drain into the river, causing pollution. High concentrations of the chemical fertiliser result in increased growth of aquatic plants. At which point is the growth of aquatic plants the least affected by fertilisers?
548
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594
The diagram shows a food web.
Which food chain shows a correct flow of energy through the web?
507
510
582
