No questions found
The diagram shows a plant that has been placed near a sunlit window for a few weeks.
Which two characteristics of living organisms have affected the shape of the plant?
597
518
589
What is a characteristic of amphibians but not of reptiles?
552
535
546
The diagram shows an insect.
Use the key to identify the insect.
1 wings present .......................................... go to 2
wings absent ..................................... A
2 two pairs of wings .................................. go to 3
one pair of wings .................................. B
3 wings with circular markings ................. C
wings without circular markings ............ D
[Image of insect]
600
506
569
The diagram shows a spongy mesophyll cell from a green leaf.
Which labelled structures are not found in animal cells?
523
527
527
What are the features of the cell walls in a xylem vessel?
[Table_1]
589
537
574
The diagram shows a plant cell which has lost water to its surroundings by osmosis. Which part is the partially permeable membrane?
538
594
551
Commercial fishermen use ice to store the fish that they catch. How does the ice keep the fish fresh?
508
513
554
What controls the speed of chemical reactions in all living cells?
591
542
566
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?
503
577
527
The diagram shows part of a leaf in cross-section.
What shows the correct function of a numbered part?
554
598
578
The roots of plants take up nitrates from the soil. What are the nitrates used to make?
518
563
577
Which diseases are caused by a lack of iron and a lack of vitamin D? [Table_1]
551
533
580
The diagram shows the human alimentary canal.
Which labelled part absorbs the most water?
536
564
536
The cholera bacterium produces toxins that cause chloride ions to be secreted into the small intestine. How does this affect the water potential of blood in the intestinal capillaries and the intestinal contents? [Table_1]
558
547
502
The diagram shows the stem of a plant. A strip of the outer tissue including the phloem has been removed.
How is transport in the plant affected?
598
529
594
The diagrams show stages in the passage of water through a plant.
Which arrow shows water moving in the form of water vapour?
598
546
548
Which substance is moved by translocation in a flowering plant?
500
510
593
The diagram shows a garden pond with a fountain worked by a pump. The fountain brings oxygen from the air to fish in the pond.
The system can be compared with part of the human circulatory system. The pump is compared with the heart.
What are P and Q compared with?
594
557
594
What happens when the left ventricle contracts?
[Table_1]
590
504
540
The diagram shows human blood cells, as seen under a microscope.
What is the function of cell X?
544
543
584
What is not a consequence of vaccination?
538
524
544
Which sequence of changes takes place when we breathe in?
567
526
558
After a race, athletes experience oxygen debt. The diagram shows how the oxygen debt is removed. What happens at X?
575
567
503
What happens as a result of deamination in the liver?
573
589
536
The diagram shows a section through a human eye.
Good colour vision is a result of a high concentration of which type of cells at which position?
580
506
514
When the blood glucose concentration is low, which hormone is released and which organ releases it?
[Table_1]
518
586
574
The diagram shows seedlings in two experiments on the tropic response of seedlings to gravity and light.
[Image_1: Diagram showing two experiments with seedlings.]
How have the seedlings responded?
540
550
548
What is the function of the many mitochondria in a sperm cell?
523
553
575
The graph shows changes in the concentrations of four hormones during the menstrual cycle. Which hormone is progesterone?
540
594
600
One parent has blood group A and the other parent has blood group B.
Their first child has blood group O.
What are the possible blood groups of their next child?
[Table_1]
597
541
513
Hb^{A} is the allele for normal haemoglobin and Hb^{S} is the allele for abnormal haemoglobin that causes sickle-shaped red blood cells.
Which row correctly matches a genotype to its phenotype?
[Table_1]
578
586
561
How do the leaves of hydrophytes differ from those of xerophytes?
565
509
508
The diagram shows a food chain.
How much energy is transferred to the bird?
589
529
533
The diagram shows part of the nitrogen cycle.
What could be responsible for process X?
513
534
592
Which statement describes the effect of predation and disease on a population?
562
549
513
Which structures, found in bacteria, make them useful in genetic engineering?
600
596
561
Why is yeast used in bread-making?
517
509
523
An advantage of some genetically modified crop plants is that they will not:
572
537
569
What is not a reason for having conservation programmes?
521
597
588
