No questions found
Which process provides an organism with the raw materials needed for tissue repair?
540
555
559
Which name is given to a group of individuals that can reproduce to produce fertile offspring?
555
579
533
An animal has four legs, hair and a tail.
To which group of vertebrates does it belong?
588
550
540
Root hair cells are found on plant roots.
Which feature is present in a root hair cell but not in a sperm cell?
529
590
588
The cells listed have specialised structures that allow them to carry out their functions.
1. ciliated cell
2. nerve cell
3. root cortex cell
4. sperm cell
Which cells have structures that can move?
559
518
529
A cell was viewed under a microscope. The actual length of the cell is 0.025 mm. The magnification of the image is ×400.
What is the length of the cell in the image?
512
515
523
The roots of a plant were placed in a solution of red dye. After 24 hours, a section of root and a section of leaf were cut from the plant.
In which tissues will the red dye be visible?
502
562
504
Which row shows features of osmosis in cells?
[Table_1]
583
588
523
Which chemical is used to test for the presence of protein in a food sample?
581
524
505
The graph shows the effect of temperature on the activity of an enzyme.
At which temperature is the enzyme most active?
565
559
558
The substances listed are found in the leaf of a plant.
Which substance is obtained from the soil?
585
502
501
The diagram shows an experiment to find out if carbon dioxide is necessary for photosynthesis.
The plant is kept in the dark for 48 hours to remove any starch. Then it is set up in the light, as shown.
After 10 hours, leaves X and Y were tested for starch.
What is the expected result?
600
527
589
The diagram shows a cross-section of a human tooth.
Which row identifies the labels in the diagram?
594
598
528
Which statement is correct?
514
599
580
Where is most water absorbed in the alimentary canal?
504
520
530
The diagram shows a bean seedling soon after it has germinated.
Where is most water absorbed?
583
557
569
Which process occurs during transpiration?
517
598
580
The diagram shows the outside of a human heart. Which structure is a coronary artery?
590
538
570
The diagram shows a section of a human vein.
What is the function of the part labelled X?
550
536
563
Campylobacter is a bacterium that can cause food poisoning.
Which word describes Campylobacter?
587
553
574
What is the approximate percentage of oxygen in expired air?
528
571
541
Which process could continue without energy from respiration?
582
515
585
Which row shows the products of anaerobic respiration in humans and yeast?
[Table with products in humans and yeast]
536
594
577
A person eats foods containing proteins. Some of the amino acids in the proteins are converted to urea and excreted from the body.
proteins $\rightarrow$ amino acids $\rightarrow$ urea $\rightarrow$ urine
Which row identifies the sites of processes 1, 2 and 3?
[Table_1]
570
560
541
Which part of the eye refracts light?
594
592
556
Which hormone causes an increase in breathing rate, an increase in heart rate and the widening of pupils?
553
599
571
Which row about tropic responses is correct?
[Table_1]
598
559
579
What occurs during fertilisation?
525
509
513
Which hormone causes the development of secondary sexual characteristics in human males?
585
513
600
The diagrams show four methods of birth control. [Image_1: Diagrams of birth control methods] What are barrier methods of birth control? [Table_1: Barrier methods with key: ✓ = yes, ✗ = no]
562
560
507
In one species of plant, the allele for red-coloured fruit is dominant and is represented by the letter R. The allele for white-coloured fruit is recessive and is represented by the letter r.
Two plants that are heterozygous for fruit colour are crossed.
What are the possible genotypes of the offspring plants from this cross?
562
504
587
Which phenotype shows discontinuous variation in humans?
539
545
587
What can increase the genetic variation in a species?
583
561
600
The diagram shows part of the carbon cycle.
Which processes reduce or increase carbon dioxide concentration in the atmosphere?
509
519
530
The diagram shows a food chain.
rose bush → aphids → ladybirds → spiders
A disease reduced the number of ladybirds.
What would be the likely effect of this on the numbers of aphids and spiders?
[Table_1]
599
516
551
The block at the base of each pyramid represents the number of producers. Which pyramid of numbers has more tertiary consumers than secondary consumers?
577
574
542
Corn that has been genetically engineered to be resistant to pests was developed in the 1990s.
The graph shows the change in the percentage of corn grown that was genetically engineered and the change in the mass of chemical insecticides used.
Which statement describes the data shown in the graph between 1996 and 2013?
529
511
538
What could be undesirable effects of deforestation?
1. extinction of species
2. increased flooding
3. reduction of atmospheric carbon dioxide
522
588
568
