Question

What is the most likely effect a decrease of plant life in the biosphere would have on the atmosphere?
a.
A decrease in plant life would have no effect on the atmosphere.
b.
A decrease in plant life would cause carbon dioxide levels to increase and oxygen levels to decrease.
c.
A decrease in plant life would cause carbon dioxide levels to decrease and oxygen levels to increase.
d.
A decrease in plant life would cause an increase in all gases in the atmosphere.

Answer 1

b. A decrease in plant life would cause carbon dioxide levels to increase and oxygen levels to decrease.

Explanation: Plants use CO2 and produce O2 during photosynthesis. Fewer plants mean less CO2 is removed from the atmosphere and less O2 is produced.