Question

In the biosphere 2 project, oxygen levels decreased over time and carbon dioxide reached dangerous levels. describe a possible solution to this problem, and explain how it relates to processes in the oxygen cycle.

Options:
a) Increase the number of plants; photosynthesis will help balance the oxygen and carbon dioxide levels.
b) Decrease the number of animals; respiration contributes to excessive carbon dioxide.
c) Increase the amount of water; evaporation of water helps in oxygen production.
d) Remove excess carbon dioxide using chemical scrubbers.

Answer 1

Increasing the number of plants in Biosphere 2 would enhance photosynthesis, leading to increased oxygen production and consumption of carbon dioxide, which addresses the imbalance in the oxygen cycle influenced by aerobic respiration. Option C

Step-by-step explanation:

The issue faced in the Biosphere 2 project with declining oxygen levels and rising carbon dioxide can be addressed through an understanding of the oxygen cycle. The oxygen cycle is primarily driven by two processes: photosynthesis and aerobic respiration.

Photosynthesis is carried out by plants, which consume carbon dioxide (CO₂) and produce oxygen (O₂), whereas aerobic respiration is the process where organisms use oxygen and produce carbon dioxide. Thus, option a) Increase the number of plants; photosynthesis will help balance the oxygen and carbon dioxide levels, provides a viable solution.

More plants would enhance the rate of photosynthesis, thereby increasing oxygen generation and CO₂ consumption. This natural method is also supportive of balanced ecosystems and aligns with the long-term stability objectives of projects like Biosphere 2. Option C