Describe an investigation you could do to show how much more a normal plant
grows compared with a variegated plant over a six-week period.
In your answer, you must clearly identify:
the independent variable (IV)
the dependent variable (DV)
the variables to control (CV)
how you will calculate the end result.
Answers
Answer:
The effect of light intensity on photosynthesis can be investigated in water plants such as Cabomba or Elodea, types of pond weed, which are sold in aquarium shops.
The plants will release bubbles of oxygen, a product of photosynthesis, which can be counted.
Aim
To investigate the effect of light intensity on the rate of photosynthesis.
Method
A lamp with an LED bulb is set up at different distances from the plant in a beaker of water:
an LED bulb is best as this will not raise the temperature of the water
sodium hydrogen carbonate (NaHCO3) is added to the water to supply the reactant carbon dioxide to the plant
the light intensity is proportional to distance - it will decrease as the distance away from the bulb increases.
An image showing the instructions on how to investigate the effect of light intensity on the rate of photosynthesis.
The bubbles produced over one minute periods are recorded. The rate of photosynthesis is the number of bubbles produced per minute.
Variables
independent variable - distance from the light source/light intensity
dependent variable - the number of bubbles produced per minute
control variables - concentration of sodium hydrogen carbonate solution, temperature, using the same piece of pondweed each time
Risks
Care must be taken when using water near electrical equipment. Ensure that your hands are dry when handling the lamp.
Extension activities
The volume of oxygen produced could be measured by collecting the gas produced in a gas syringe.
Answer:
The impact of light force on photosynthesis
can be researched in water plants, for example,
Cabomba or Elodea, kinds of lake weed, which are sold in aquarium shops.
The plants will deliver air pockets of oxygen, a result of photosynthesis, which can be
counted.
Explanation:
Aim
To research the impact of light power on the pace of photosynthesis.
Methods
A light with a LED bulb is set up at various good ways from the plant in a recepticle of water:
a LED bulb is best as this won't raise the temperature of the water
sodium hydrogen carbonate (NaHCO3) is added to the water to supply the reactant carbon dioxide to the plant
the light power is corresponding to remove - it will diminish as the separation away from the bulb increments.
A picture telling the guidelines on the best way to explore the impact of light force on the pace of photosynthesis.
The air pockets created north of brief periods are recorded. The pace of photosynthesis is the quantity of air pockets delivered each moment.
Factors
free factor - distance from the light source/light force
subordinate variable - the quantity of air pockets
created each moment
control factors - centralization of sodium hydrogen carbonate arrangement, temperature, utilizing a similar piece of pondweed each time
Gambles
Care should be taken while utilizing water close to electrical gear. Guarantee that your hands are dry while dealing with the light.
Expansion exercises
The volume of oxygen created could be estimated by gathering the gas delivered in a gas needle.
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