Topic 6 - Interaction Of Limiting Factors In Photosynthesis Flashcards
What is the purpose of measuring oxygen production in a plant experiment?
To calculate the rate of photosynthesis
Oxygen production is a direct indicator of photosynthetic activity.
What plant is commonly used in experiments to measure photosynthesis?
Pondweed
Pondweed is a common aquatic plant used due to its ability to produce oxygen during photosynthesis.
How is the rate of oxygen production measured in the experiment?
By measuring the distance the oxygen bubble has moved in the capillary tube
This movement correlates to the volume of oxygen produced.
What environmental factors can be varied to observe their effect on photosynthesis?
- Temperature
- Time the pondweed is left
- Light intensity
Each of these factors can influence the rate of photosynthesis.
What is the independent variable in the photosynthesis experiment?
The factor you want to observe (e.g., light intensity)
All other factors should be controlled to ensure a valid experiment.
What is a limiting factor in photosynthesis?
An environmental condition that restricts the rate of photosynthesis at low levels
Examples include light intensity, temperature, and carbon dioxide concentration.
What does a graph with one line that levels off indicate?
One limiting factor affecting photosynthesis
The x-axis represents the limiting factor, while the y-axis shows the rate of photosynthesis.
What does a graph with two lines represent?
Two limiting factors in two different experiments
Each line corresponds to a different environmental condition.
How is light intensity measured in the context of photosynthesis?
In lux
Lux is a unit of measurement for illuminance.
At what light intensity was the limiting factor observed in the experiment?
50 lux
At this level, the rate of photosynthesis was limited compared to the 100 lux experiment.
