To Investigate The Influence Of Light Intensity/CO2 On The Rate Of Photosynthesis Flashcards
Where in the cell does the dark stage take place?
Chloroplast (stroma)
Why is the dark stage called the dark stage?
3
It can occur in the dark
It is light independent
Light is not required
Name the plant you used for this experiment.
Elodea
Why did you use Elodea in this experiment?
2
It is an aquatic plant so it will produce bubbles of gas which can be easily seen
Bubbles of O2 visible in water
How did you measure the rate of photosynthesis?
Counted the number of bubbles per unit time/per minute
Explain the shape of the graph produced during your investigation of the influence of light intensity on the rate of photosynthesis.
(4)
X- axis = light intensity
Y-axis =Rate of number of bubbles per minute
As light intensity increases the rate of photosynthesis increases
Rate levels of as saturated point is reached (plant is said to be saturated with light)
Define an anabolic reaction..
Anabolic reactions use energy to convert smaller molecules into larger molecules
Define a metabolic reaction.
Metabolism is the sum of all the chemical reactions in an organism
State one possible source of error for your experiment.
3
Error in counting bubbles
Error in measuring lamp distance from flask
Error in measuring time interval
Explain what is meant by the term energized electrons.
The electrons have gained energy/excited
High energy electrons are used in photosynthesis, where are these electrons located?
Chlorophyll
Explain how you ensured the temperature remained constant throughout the investigation.
Thermostatically controlled water bath
What factor did you keep constant?
2
Lamp wattage kept constant
Temperature kept constant at 25 degrees
What factor did you vary?
Varied the lamp distance from the plant
Name the organelle in which chlorophyll is found.
Chloroplast
What is the importance of chlorophyll in photosynthesis?
To trap sunlight
What would happen if you carried this experiment out at a higher temperature?
The rate of photosynthesis would increase
Why would the rate of photosynthesis increase at a higher temperature?
(2)
Because a greater temperature allows for a greater rate of photosynthesis
Temperature is not limiting
Name the stage which requires light.
Stage one - Light stage (light-dependent stage)
Oxygen is an important by-product of photosynthesis. Explain why.
Oxygen is needed for respiration
At what temperature did you carry out the experiment?
25 degrees Celsius
Explain why you carried out this experiment at 25 degrees Celsius.
This is the optimum temperature for enzymes
Name the food product of photosynthesis.
Glucose
Name the non-food product of photosynthesis.
Oxygen
Name the green pigment needed for photosynthesis.
Chlorophyll
In what organelle is chlorophyll found?
Chloroplast
State a role for carbon dioxide in photosynthesis.
Supplies carbon
State a role of water in photosynthesis.
2
Supplies protons (H+)
Supplies electrons
