No questions found
Which process is carried out by all organisms?
570
524
540
What are features of the leaves of a plant that is a dicotyledon?
[Table_1]
519
541
561
The photomicrograph shows a cell from a type of aquatic plant.
Which parts labelled on the photomicrograph indicate that this is a plant cell?
554
575
540
The diagram shows an image of a chloroplast. The image is 5 cm long.
The actual length of the chloroplast is 5 \mu m.
What is the magnification of the image?
567
570
547
What are features of osmosis?
[Table_1]
592
549
520
The diagram shows apparatus which can be used to demonstrate osmosis.
After one hour, what would happen to the liquid levels in the glass tubes?
544
534
581
Which substances are made by linking together glucose molecules only?
538
507
595
When bases pair up in the formation of DNA, what is one of the pairings?
590
541
549
The graph shows the effect of pH on the rate of reaction of an enzyme.
What does the graph show?
563
579
596
The graph shows how enzyme activity is affected by temperature.
How can the change in activity between 40°C and 55°C be explained?
502
527
513
The graph shows how the rate of photosynthesis of a plant changes with light intensity, at three different carbon dioxide concentrations. In each case the temperature is 15°C. [Graph]
What is the limiting factor for the rate of photosynthesis at point X on the graph?
582
528
582
The graph shows how the percentage of protein found in potatoes was affected by the concentration of nitrate fertiliser added to the crop when it was growing.
These results suggest that greater concentrations of nitrate fertiliser allow the potatoes to make more
564
594
554
Which stage of nutrition takes place when food molecules become part of a body cell?
558
563
543
The diagram shows the apparatus used in an experiment to demonstrate two processes that take place in the body. After one hour, the water outside the dialysis tubing contained reducing sugars.
Which two processes are represented by this experiment?
567
547
572
In which order does water pass through these structures in a plant?
504
529
574
What is a function of phloem?
504
506
591
What ensures that blood flows in one direction in the human circulatory system?
551
511
542
The diagrams show four components of blood.
Which component produces antibodies?
523
551
578
A patient was injected with antibodies after being bitten by a poisonous snake. The patient recovered and survived.
What describes the effect in the patient's body?
[Table_1: showing active immunity, passive immunity, and memory cells produced with options A, B, C, D and a key defining ✓ as yes and ✗ as no]
579
517
547
The diagram shows some of the structures in a human lung. Where is the carbon dioxide concentration highest?
599
595
590
What is produced during anaerobic respiration in muscles?
596
508
588
How do the concentrations of glucose and urea in urine compare to their concentrations in blood plasma?
[Table_1]
521
581
576
Which structure contains relay neurones?
568
582
529
A man injures his arm in an accident. Afterwards, he can move his hand but cannot feel objects touching his hand.
What could cause this?
504
564
509
How does the skin react when the body becomes cold?
[Table_1]
520
591
558
Which characteristic of viruses prevents them from being affected by antibiotics?
547
507
540
Some flowers can only be pollinated by specific insect species.
What will happen if none of these insects are present?
529
593
518
Which hormone is used in contraceptive pills?
576
541
514
Which hormone causes the lining of the uterus to become thick and glandular before ovulation?
535
546
501
The diagrams show human nuclei and the number of chromosomes in each nucleus.
Which diagram represents nuclear division of skin cells for growth and repair?
528
594
594
Meiosis is sometimes called 'reduction division'.
What is reduced during meiosis?
590
594
577
In guinea pigs, the allele for black fur is dominant and the allele for white fur is recessive. A test cross can be used to determine the genotype of a black guinea pig. What would be the expected result of the test cross if the black guinea pig was heterozygous?
521
588
558
What is not affected by the environment?
571
507
586
Desert plants have evolved to survive in places where very little water is available.
Which process is reduced to enable them to retain as much water as possible?
543
588
598
The diagram shows a pyramid of numbers.
What is the correct description of the trophic levels?
[Table_1]
585
504
551
Bacteria are active in the nitrogen cycle.
Which process in the nitrogen cycle is carried out by nitrifying bacteria?
583
520
588
The diagram shows a population growth curve.
How long does the population remain in the stationary phase?
596
547
501
The stages describe how genetic engineering can be used to produce human insulin from bacteria.
1. cut bacterial plasmid DNA with restriction enzymes
2. extract gene for insulin from human DNA with restriction enzymes
3. insert recombinant plasmid into bacteria
4. join human DNA to bacterial plasmid DNA using DNA ligase
5. replicate bacteria containing recombinant plasmid
Which sequence will lead to the production of human insulin by bacteria?
590
579
558
What is an example of sustainable use of resources?
515
518
520
The hormones from the female contraceptive pill can pollute water courses. What effect do they have?
558
518
519
