No questions found
Which organisms carry out respiration, growth, movement and excretion?
534
596
551
The chimpanzee belongs to the species $Pan troglodytes$.
What is the genus of this species?
529
526
518
The diagram shows a tree leaf.
Use the key to identify the tree species to which the leaf belongs.
leaf shape:
- leaf is simple, with no leaflets:
- leaf edge smooth: Fagus sylvatica
- leaf edge jagged: Ulmus minor
- leaf is compound, with many leaflets:
- leaf edge smooth: Fraxinus americana
- leaf edge jagged: Sorbus aucuparia
519
577
552
What is the function of mitochondria in cells?
540
544
590
Which row shows a function of the cell membrane and a function of the cell wall in a palisade cell?
[Table_1]
520
508
520
A specimen is viewed under a microscope with a $\times10$ magnification. The specimen image measures 30 mm.
What is the actual size of the specimen?
500
510
514
The diagram shows the water potential of three plant cells. The more negative the value, the higher the solute concentration.
What is the immediate movement of water that will occur between the three cells?
600
504
579
Which base in a DNA molecule always pairs with a G base?
587
557
593
The diagram shows the steps in an enzyme-controlled reaction.
What describes the part labelled X?
532
528
542
The graph shows the effect of temperature on the time taken for the complete digestion of starch.
At which temperature is the rate of digestion of starch the greatest?
590
557
527
Which substance is needed to make chlorophyll and which part of the plant absorbs the substance?
[Table_1]
596
547
558
The diagram shows a type of plant cell.
In which tissue is this cell found?
538
511
587
Which components of a balanced diet are needed to make haemoglobin and to prevent scurvy and rickets?
551
588
570
Which group of organs belongs to the same organ system?
523
527
543
The diagram shows a villus.
Which parts transport glucose and fatty acids away from the villus?
[Table_1]
593
571
513
Which conditions lead to the lowest rate of transpiration in a plant?
552
534
535
The table shows the transport tissues of plants and some substances that may or may not travel through these tissues.
Which row is correct for translocation?
[Table_1]
593
566
514
The diagram shows the circulatory system of a fish.
What is the structure labelled X?
508
527
573
Which factors increase the risk of developing coronary heart disease?
1 increased age
2 regular exercise
3 smoking
4 stress
526
596
562
Which features of the human body protect against pathogens in food?
[Table_1]
585
590
556
What causes air to enter the lungs?
[Table_1]
562
526
576
The symbol equation for aerobic respiration is shown.
$$C_6H_xO_y + 6O_2 \rightarrow 6CO_z + 6H_2O$$
Which numbers represent the letters shown in the equation as x, y and z?
[Table_1]
582
575
580
A student investigates the rate of anaerobic respiration in yeast.
The total volume of carbon dioxide produced is measured every 10 minutes for 40 minutes. The table shows the results.
[Table_1]
Between which times is the rate of anaerobic respiration fastest?
584
523
563
Which part of an amino acid is removed during deamination?
549
549
580
Which process happens in a glomerulus in the kidney?
562
514
510
The diagram shows a synapse in a reflex arc.
What are the identities of the two neurones and in which direction does the neurotransmitter pass?
[Table_1]
537
522
582
Which responses occur in the iris of the eye when a person walks from a brightly lit area to a dimly lit area?
[Table_1]
562
577
511
Which statements about hormones are correct?
1 Adrenaline decreases pupil diameter.
2 Adrenaline increases pupil diameter.
3 Insulin decreases blood glucose concentration.
4 Insulin increases blood glucose concentration.
590
568
507
Bacteria such as MRSA are resistant to antibiotics.
These processes can occur in bacteria.
1. artificial selection
2. genetic variation
3. mutation
4. natural selection
Which processes lead to the development of antibiotic resistance?
524
592
549
A farmer grows hot pepper plants and sweet pepper plants in different fields on his farm.
Each year, the farmer saves seeds from the pepper plants to grow the next crop of peppers.
One year, the farmer notices that some of the seeds from the sweet pepper plants have grown into plants which produce hot and sweet peppers.
What is the most likely explanation?
595
516
534
Why do different cells in a human body produce different proteins?
600
551
579
Which graph shows the changes in the mass of DNA in one cell during one cell cycle?
535
543
586
Which statement about gene mutations is correct?
569
531
547
The diagram shows the amount of energy in kJ m$^{-2}$yr$^{-1}$ at each trophic level of a food chain.
producers $\rightarrow$ primary consumers $\rightarrow$ secondary consumers
88 000 14 000 2000
Approximately how much energy is lost between the producers and the secondary consumers?
547
573
534
Which process in the nitrogen cycle removes nitrogen gas from the atmosphere?
519
559
575
What is a population?
589
552
529
A farmer has a small pond on their farm land.
One year, most of the organisms in the pond die.
The next year, the farmer decreases their use of nitrate fertilisers and fewer organisms in the pond die.
Which statement explains why this will help increase the number of organisms living in the pond?
524
558
545
The graph shows how the population of a species of bird has increased following a conservation programme.
What is the percentage increase in the number of breeding pairs of birds from 1996 to 2002, to the nearest whole number?
541
565
549
The diagram shows a bacterial cell that is used in genetic modification.
Which labelled structure makes the bacterium useful for genetic modification?
590
538
563
The diagram shows some apparatus that was used to produce lactose-free milk.
The alginate beads do not react with any of the substances. X is an enzyme that catalyses a reaction involving one of the substances found in milk.
What are X and Y?
[Table_1]
530
525
588
