Question

Free services provided to humans by ecosystems include

• A. control of atmospheric carbon dioxide concentration.
• B. prevention of soil erosion.
• C. filtering of pollutants from water and air.
• D. all of the above

Answer 1

Answer: (D)

all of the above

Ecosystem services are the products of ecosystem processes. These services include conditions and processes by which the species are able to survive and sustain their life.

• Trees control atmospheric carbon dioxide concentration because they take up carbon dioxide and perform photosynthesis through which they release oxygen in the atmosphere. Hence, quality of air is maintained by ecosystems.
• The roots of plants held the soil particles tightly which prevent soil erosion.
• Plants filter out pollutants from water and air by trapping pollutants. They absorb pollutants from air and water in their tissues.

Hence, all the statements given in the question are correct.

So, the correct answer is 'All of the above'.