A group of students placed a sprig (piece) of conifer in a beaker of water. They measured the amount of oxygen given off during a set period of time to determine the rate of photosynthesis. They changed the temperature of the beaker using an ice bucket and a hot plate. Their data are summarized in the graph below.
Oxygen Production vs. Temperature
80
70
Number of Oxygen Bubbles
(per minute
888
20
10
04
5 10 15 20 30 35 40
Temperature (°C)
What is the responding (dependent) variable?
Ao the sprig of conifer
B
number of oxygen bubbles
С
O temperature
D
O time