What do your results tell you about light and photosynthesis?
Light is essential for photosynthesis. Green plant cells that are placed in the dark will not photosynthesis. In this experiment, the light intensity is changed, by decreasing the light intensity. The rate of photosynthesis should decrease and therefore the amount of oxygen bubbles should decrease.
What gas does pondweed release?
The effect of light intensity on photosynthesis can be investigated in water plants. Use Cabomba or Elodea, which are sold in aquarium shops. The plants will release bubbles of oxygen – a product of photosynthesis – which can be counted.
How does nahco3 affect photosynthesis?
If more baking soda is added to the sodium bicarbonate solution, then the leaf disks will rise to the surface of the solution quicker because of the subsequent increase in carbon dioxide levels which induces photosynthesis in the presence of light and leads to the accumulation of oxygen in the air spaces of the spongy …
What is the relationship between light and photosynthesis?
Light is an extremely important factor for the process. If there is enough water, carbon dioxide, and the temperature is right, light becomes the factor which will affect photosynthesis. Most of the time, when the intensity of light is high, you will get a a greater rate of photosynthesis.
Why is the end of the pondweed cut off?
the most obvious filters to start investigating. Like many other water plants, pondweed has specialised tissue called aerenchyma that allows oxygen to diffuse inside the plant. If you cut through the aerenchyma this gas can escape.
How do I improve my pondweed experiment?
Method
- Set up the apparatus as in the diagram.
- Leave for five minutes for the pondweed to acclimatise to the new light intensity.
- Count the number of bubbles given off in one minute.
- Move the light 10 cm further back.
- Leave for five minutes for the pondweed to acclimatise again.
Why is baking soda used in photosynthesis experiment?
The bicarbonate serves as a source of carbon dioxide for photosynthesis. The dishwashing liquid wets the hydrophobic surface of the leaf allowing the solution to be drawn into the leaf.
What is the role of NaHCO3 in this experiment?
The function of the sodium bicarbonate in this experiment, was providing carbon dioxide for photosynthesis to occur. Once photosynthesis occurs for this type of reaction, sugar is produced. The energy used for a light independent reaction is energy (ATP) from the light dependent reactions and the sugar energy.
How are the independent variables of photosynthesis measured?
Independent Variables Light Intensity/cm (10, 20, 30, 40 and 50 cm) Distance between light source and plant is changed during the experiment and measured by the ruler. Dependent Variables Rate of Photosynthesis/ Number of Oxygen Bubbles The rate of photosynthesis is measured by the counting of number of released bubbles which is oxygen.
How to find out the rate of photosynthesis?
Count the number of bubbles given off in one minute. Repeat by moving the lamp away by 10 cm intervals until 50 cm is reached. Independent variable – the light intensity (how close the light is). Dependant variable – the number of oxygen bubbles given off (the rate of photosynthesis).
How are oxygen bubbles measured in photosynthesis experiments?
At lower light intensities, when the light is further away, the rate of photosynthesis reduces and so fewer oxygen bubbles should be observed. The volume of oxygen produced could be measured by collecting the gas produced in a gas syringe. The changes in the oxygen concentration in the water could be measured using datalogging equipment.
How to investigate the effect of different wavelengths of light on photosynthesis?
You could investigate the effect of different wavelengths of light on photosynthesis. Use coloured acetate filters to investigate the effects of the blue, green and red parts of the spectrum on photosynthesis.
