Leaves
6. a student placed a test tube containing elodea (an aquatic plant) and pond water 10 cm from a
source. he observed that the plant wave off bubbles of a gas and counted how many bubbles were
released in one minute. he moved the plant farther away from the light source to see if distance from
the source made a difference. the data table below shows his results.
light source
gas production
distance from light bubbles produced
(cm)
per minute
10
40
20
30
30
7
404
the gas that was being produced was most likely
a) carbon dioxide as a product of the process of respiration
b) carbon dioxide as a product of the process of photosynthesis
c) oxygen as a product of the process of respiration
d) oxygen as a product of the process of photosynthesis