Plant response

• The aim of the experiment is to investigate the effect of light or gravity on the growth of newly germinated seedlings.
• The equipment required for the experiment includes white mustard seeds, petri dishes, cotton wool, a ruler, water, a window with exposure to light, and a dark cupboard.
• In the first step of the method, a fixed volume of water is poured into 3 petri dishes and cotton wool is added.
• Ten seeds are placed in each petri dish.
• The petri dishes are placed in a warm location such as an incubator, not to be disturbed.
• Time is allowed for the seeds to germinate.
• If necessary, more water is added to the petri dishes to maintain the same volume for each dish.
• Excess seeds are removed from the petri dishes so that they have the same number of seedlings.
• One petri dish is placed in full sunlight by a window.
• A second petri dish is placed in partial sunlight.
• A third petri dish is placed in darkness in a cupboard.
• The height of each seedling is measured every day for at least a week and recorded in a table.
• The mean height of the seedlings is found each day.
• A graph of 'mean height of seedling' against 'day' is plotted.
• Environmental conditions for the experiment include full sunlight, partial sunlight, and darkness.
• Seeds may be a biohazard and should be handled with care.
• Wash your hands after handling seeds.