investigting the effect of light intensity on photosynthesis
Biology lab: measuring the effect of light intensity on plant growth
Aim:
Investigate the effect of light intensity on plant growth
Hypothesis:
Light intensity will have an effect on plant growth. With an increase in light intensity there will be plant growth at a faster rate in comparison to when the light intensity is low where plant growth is limited and will take place slowly. When there’s too much light intensity, the light intensity will no longer become a limiting factor. A limiting factor is a factor that controls any particular process at the minimum rate. This control the rate of the process which in this case is the light intensity. This can also be called the rate limiting factor as it affects the rate of photosynthesis. Introduction
Photosynthesis is an essential process by which plants make their food in order for growth and respiration to happen. Carbon dioxide water and light combine to manufacture food which comes in the form of glucose for use. Light is a very important aspect in plant growth as with light the light dependent reaction in photosynthesis is able to take place. In this process light is used to break down water, and the photon energy is used to move the electron to the reaction centre where it gets excited. The light dependant reaction is essential as products obtained from this process are used in the light independent stage of photosynthesis. The products made in the light independent stage of photosynthesis are NADP+ and ADP.
Apparatus
1 Lamp
6 Green aquatic plant (Elodea)
1 500ml Beaker
1 Thermometer 110°C ±0.5
1 Metre ruler ±0.5
1 Test tube
50g Sodium hydrogen carbonate
1 Funnel
1 Stopwatch
1 water bath
Independent variable
Distance between plant and light bulb affecting the light intensity
Dependant variable
Number of oxygen bubbles of oxygen produced as a bi-product of photosynthesis.
Control variables:
Type of plant
Temperature of the surroundings
Use the same colour light
Aim:
Investigate the effect of light intensity on plant growth
Hypothesis:
Light intensity will have an effect on plant growth. With an increase in light intensity there will be plant growth at a faster rate in comparison to when the light intensity is low where plant growth is limited and will take place slowly. When there’s too much light intensity, the light intensity will no longer become a limiting factor. A limiting factor is a factor that controls any particular process at the minimum rate. This control the rate of the process which in this case is the light intensity. This can also be called the rate limiting factor as it affects the rate of photosynthesis. Introduction
Photosynthesis is an essential process by which plants make their food in order for growth and respiration to happen. Carbon dioxide water and light combine to manufacture food which comes in the form of glucose for use. Light is a very important aspect in plant growth as with light the light dependent reaction in photosynthesis is able to take place. In this process light is used to break down water, and the photon energy is used to move the electron to the reaction centre where it gets excited. The light dependant reaction is essential as products obtained from this process are used in the light independent stage of photosynthesis. The products made in the light independent stage of photosynthesis are NADP+ and ADP.
Apparatus
1 Lamp
6 Green aquatic plant (Elodea)
1 500ml Beaker
1 Thermometer 110°C ±0.5
1 Metre ruler ±0.5
1 Test tube
50g Sodium hydrogen carbonate
1 Funnel
1 Stopwatch
1 water bath
Independent variable
Distance between plant and light bulb affecting the light intensity
Dependant variable
Number of oxygen bubbles of oxygen produced as a bi-product of photosynthesis.
Control variables:
Type of plant
Temperature of the surroundings
Use the same colour light