In a photosynthesis experiment, a plant is left in bright sunlight for several hours. A leaf is then removed from the plant and tested for starch, using iodine solution.
The diagram shows the leaf from the plant that was used in the experiment.
Which diagram shows the result of the experiment
A plant with variegated leaves has the starch removed from its leaves by placing it in a dark cupboard for 48 hours. Black paper is then fixed on one leaf as shown and the plant is exposed to light.
After 24 hours, which part of the leaf contains starch?
A plant with striped leaves similar to the one below was kept in bright light for six hours.
A leaf was taken from the plant and the chlorophyll removed. It was then tested for starch using iodine solution.
Which diagram shows the result of the test?
This apparatus was set up as shown.
Sodium hydroxide removes carbon dioxide from the air. Limewater goes cloudy if carbon dioxide is bubbled through it.
What happens to the limewater in flasks X and Y when the pump is switched on?
An experiment was done using the apparatus shown in the diagram.
The carbon dioxide content of the water in each tube was measured at the start and again three hours later.
In which tube would there be a decrease in carbon dioxide content?
The diagram shows the apparatus used in an investigation to measure the rate of oxygen production during photosynthesis.
The investigation was repeated several times and the average amount of gas collected was calculated.
Which two factors must be kept constant during this investigation?