The graph shows the relationship between the number of lichens and the levels of sulfur dioxide pollution. It indicates that as the sulfur dioxide levels increase, the number of lichen decreases. Which one of following is the best conclusion drawn from the above graph?
Correct answer: D. Sulfur dioxide has relation with lichen growth
- A. Sulfur dioxide is an essential nutrient for lichen growth
- B. Lichens are good pollution indicators
- C. Lichens use sulfur dioxide in photosynthesis
- D. Sulfur dioxide has relation with lichen growth
Explanation
Sulfur dioxide (SO2) can actually have a significant impact on lichen growth and health. Lichens are sensitive to air pollution, including sulfur dioxide, which can cause damage to their tissues and inhibit their growth. High levels of sulfur dioxide in the air can lead to the decline or death of lichen populations in affected areas. Therefore, sulfur dioxide does have a direct relation to lichen growth, albeit in a negative way, as it can be detrimental to their health and survival.
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Pollution covers the sources and effects of air, water, soil, noise and thermal pollutants, including toxicity, biomagnification, eutrophication and global environmental change. Conservation focuses on protecting biodiversity through habitat preservation, sustainable resource use, protected areas, wildlife laws, and in situ and ex situ methods.
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