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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?
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A rat has the scientific name $Rattus$ $rattus$.
What do the two parts of this name refer to?
544
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570
The diagram shows two guard cells.
Which label shows the cell wall?
540
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The diagrams show different levels of organisation in a plant.
Which sequence shows the levels of organisation in order from smallest to largest?
515
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565
Which diagram shows the appearance of a plant cell several minutes after it has been placed in a concentrated solution of sugar?
531
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592
Plant cells are placed in a solution with a higher water potential than the plant cell contents. What will happen? [Table_1]
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The diagram shows a section of DNA, with four bases identified on one strand .
Which sequence of bases would be on the other strand, starting from the top?
519
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Which food-testing solution shows a positive result when it turns from blue to purple?
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An experiment is set up to investigate gas exchange in aquatic plants. The hydrogencarbonate indicator solution is orange at the start. Which colour is it after three hours?
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The diagram shows how the rate of photosynthesis varies with light intensity. The four curves show different conditions of temperature and carbon dioxide concentration.
What limits the rate of photosynthesis at point P?
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Four test-tubes are set up as shown. Which test-tube contains the least carbon dioxide after one hour?
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The activity of amylase is measured in four parts of the alimentary canal.
Which two parts have the most amylase activity?
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Biological washing powder can be used to remove stains on clothing.
Which enzymes will remove stains caused by starch, fat and protein?
[Table_1]
519
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553
The graph shows the rate of uptake of magnesium ions by two similar plants, X and Y.
The roots of each plant were placed in a range of solutions. Each solution contained a different concentration of magnesium ions. All other conditions were kept constant.
What is a possible explanation for the difference in the results for the two plants?
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What will increase the rate of transpiration in a plant?
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583
Which pathway is taken by blood in a fish?
563
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The diagram shows a section through the heart and its blood vessels.
Which row gives the vessel name and the direction of blood flow in vessel X?
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When a pathogen enters the blood, the immune system uses different mechanisms to destroy the pathogen.
The diagram shows one of these mechanisms.
Which row describes the structures involved?
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What is the approximate percentage of oxygen contained in the air breathed out of the lungs?
510
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The diagram shows an experiment to investigate the respiration of yeast. Oil prevents oxygen entering the glucose and yeast suspension.
If no oxygen is present in the glucose and yeast suspension, what will occur?
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Which row correctly completes the balanced equation for aerobic respiration?
$$X + 6O_2 \rightarrow 6CO_2 + Y$$
[Table_1]
562
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In healthy people, which substance is completely reabsorbed into the blood from the kidney tubules?
541
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597
The diagram shows a synapse.
What are the labelled parts?
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Which row shows the actions needed for the eye to focus on a distant object?
[Table_1]
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510
The liver and the pancreas work together to control the concentration of glucose in the blood.
Which statement is correct?
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The statements are about the use of antibiotics.
1. using an antibiotic to prevent infection
2. using an antibiotic known to kill the bacteria causing an infection
3. using an antibiotic only when essential
4. using an antibiotic to treat a viral infection
Which practices will increase the chance of the development of antibiotic resistance in bacteria?
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Which description of cross-pollination is correct?
591
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540
The diagram shows a sperm cell. Which part contains enzymes that digest the jelly coat of an egg cell?
572
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527
Which cell contains a haploid nucleus?
545
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The diagram shows the chromosomes of four daughter cells produced by meiosis.
Which parent cell produced these cells?
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When damaged tissues are repaired cells undergo division by
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The graph shows the masses of two different types of tomato.
What can be concluded from the graph?
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Which adaptation may be present in a xerophyte?
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The diagram shows a food chain in a rock pool.
seaweed \rightarrow whelks \rightarrow crabs \rightarrow seagulls
What will happen if the number of secondary consumers increases?
There will be
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What is defined as 'all of the populations of different species in an ecosystem'?
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What is the role of anaerobic respiration in bread-making?
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A crop plant has been genetically modified to make it resistant to herbicides. Which is a possible disadvantage of introducing this new crop plant?
536
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Which process in the nitrogen cycle is involved in the breakdown of amino acids in living organisms?
565
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When a river is polluted by fertiliser, the following processes may occur.
1 increased aerobic respiration of decomposers
2 increased growth of producers
3 decreased oxygen concentration in the water
What is the correct sequence for these processes?
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537
