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The diagrams show a test-tube containing pond water. The green colour is caused by microorganisms that have chloroplasts.
Which characteristics of living organisms are shown?
The key shows some features of living organisms that can be used to place them into one of three different kingdoms.
Which row correctly identifies these three kingdoms?
The diagram shows a mitochondrion. The scale bar shows the actual size of the mitochondrion.
The diagram is 70 mm long.
What is the magnification of the diagram?
Two types of cell, one animal and one plant, were examined using a light microscope.
Which row shows the correct combination of structures that would be observed in the cells?
The diagram shows a cross-section through a leaf.
Which arrow shows the direction of diffusion of carbon dioxide on a sunny day?
The diagram shows a plant cell after it has been submerged in a solution, P, for 20 minutes.
Which row describes the water potential of solution P at the start of the experiment and the condition of the cell after 20 minutes?
Which row is correct for a positive food test for vitamin C?
In which molecule are cross-links formed between bases?
What controls the speed of chemical reactions in all living cells?
Enzymes have an optimum temperature at which they are most active.
Which row explains why enzyme activity decreases if the temperature is not optimum?
A piece of foil was placed over one green and white leaf on a plant.
The plant was placed under a bright light for 24 hours and then tested for starch with iodine solution.
Which diagram shows the areas of the leaf that would stain blue-black with iodine solution?
The graph shows the effect of light intensity on the rate of photosynthesis
Which environmental factor is limiting the rate of photosynthesis at X on the graph?
Which condition can be caused by a lack of fibre in the diet?
In which test-tube will the breakdown of fat be fastest?
The diagrams show stages in the passage of water through a plant.
Which arrow shows water moving in the form of water vapour?
The diagram shows some potato tubers. New shoots are beginning to grow.
Sucrose is being translocated from source to sink.
Which statement is correct?
The diagram shows a section through the heart.
What is the function of the structure labelled Q?
During the process of blood clotting, damage to blood vessels stimulates L, and M is converted to N.
What are L, M and N?
Which statement about passive immunity is correct?
Compared with inspired air, which description of expired air is correct?
Which row shows the features of the gas exchange surface in humans?
Yeast is placed inside a container full of a glucose solution with no air.
Which word equation summarises the process that takes place inside the container?
Which process uses energy released in respiration?
Which term describes the removal of the nitrogen-containing part of amino acids to form urea?
Which numbered parts form the central nervous system?
The diagram shows a section through the eye of an octopus. Octopuses have eyes that are similar in structure and function to human eyes.
A person eats a large bowl of rice. Rice contains starch.
What happens to the amounts of insulin and glucagon in their body
A study investigated the effect on arm muscle surface area of taking testosterone and doing exercise. The participants in the study were given either testosterone or a placebo. The placebo does not contain any testosterone.
The bar chart shows the results of the study.
What will happen if a woman smokes during pregnancy?
The graph shows the four hormones that control the menstrual cycle.
Which curve on the graph represents the hormone LH?
What happens to the mass of DNA in a nucleus before mitosis occurs?
In a species of pea plant, height is controlled by one gene.
The allele for tall is dominant to the allele for short.
A test cross is done to identify the genotype of a tall pea plant. The table shows the possible phenotypes of the offspring and a description of the genotypes of the tall parent pea plant.
Which statement about variation is correct?
Some plants have small leaves with thick waxy cuticles.
Which row describes the effect of these features on water loss and the type of plant that has these features?
Some plants of different species can be crossed with each other to form hybrids that have a diploid number different from either of the two parent specie
The diagram shows a cross between plants with different diploid numbers.