Required Practical - Investigation the effect of light differences is on Photosynthesis Flashcards
1
Q
What is the point of the experiment?
A
To find out the effect of light intensity on the rate of photosynthesis
2
Q
Method:
A
- Place a piece of pondweed in a beaker and place a lamp a specific distance away.
- Record the number of bubbles produced in one minute.
- Repeat with the lamp at different distances.
3
Q
What are the controlled variables?
A
Temperature, the piece of pondweed, and the concentration of carbon dioxide.
4
Q
What is the independent variable?
A
light intensity
5
Q
What is the dependent variable?
A
The number of bubbles produced in one minute
6
Q
Why are results inaccurate?
A
- Because of the bubbles each count as ‘1’ despite being different sizes.
- It may be difficult to count small bubbles
7
Q
Why should you leave the plant for a few minutes?
A
To let it adjust to the conditions - light/temperature
8
Q
What are limiting factors from light?
A
The plant also needs enough CO2 and temperature.
9
Q
How could you stop the lamp heating the beaker?
A
Place a glass block in front of it.
10
Q
What hazards are there?
A
That water may hit the light bulb
