Question

Hon placed aquatic plants in several test tubes that were filled with water. Then, he placed half of the test tubes in a dark closet and the other half in a well-lit room. When he recorded his data, some of the plants had formed many small bubbles on the leaves, and some did not. Which describes what Hon most likely observed and the reason for these results?
a) The plants in the dark formed bubbles because they released hydrogen gas.
b)The plants in the dark formed bubbles because they released water vapor.
c)The plants in the light formed bubbles because they released carbon dioxide gas.
d)The plants in the light formed bubbles because they released oxygen gas.

Answer 1

Answer:

D

Explanation:

The plants in the light formed bubbles because they released oxygen gas, This is because bubbles that are formed takes the places of oxygen molecules O2. Oxygen is released during photosynthesis through the process called light-dependent reaction.  The light-dependent reaction occurs only in the presencee of light. So, if bubbles formed are equivalent to oxygen molecules released in light-dependent reaction, then it is expected for bubbles to be found only on the leaves on those plants that were in a well-lit room.