Question

how do human activities impact the carbon cycle in an ecosystem?
a. they increase the amount of carbon dioxide released into the atmosphere.
b. they have no significant impact on the carbon cycle.
c. they promote the growth of plants, which store more carbon.
d. they slow down the process of photosynthesis

Explanation:

• Option A: Human activities like burning fossil fuels (coal, oil, gas) release large amounts of carbon dioxide that was previously stored in the Earth. Deforestation also reduces the number of plants that can absorb carbon dioxide through photosynthesis, further increasing atmospheric carbon dioxide levels.
• Option B: This is incorrect. Human activities have a significant impact on the carbon cycle as explained above.
• Option C: While some re - forestation efforts can promote plant growth, overall, human activities (especially deforestation and fossil fuel burning) have a net negative effect on carbon storage in plants.
• Option D: Human activities do not directly slow down the process of photosynthesis. In fact, increased carbon dioxide can sometimes enhance photosynthesis in some plants (though this has complex ecological implications).

Answer:

A. They increase the amount of carbon dioxide released into the atmosphere