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Question
Assertion :The trees that are present on road sides usually do not show the growth of lichens. Reason: Lichens are very sensitive to the levels of contaminants like SO2 present in air.
Assertion :The trees that are present on road sides usually do not show the growth of lichens. Reason: Lichens are very sensitive to the levels of contaminants like SO2 present in air.
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Solution
The correct option is A Both assertion and reason are correct and reason is the correct explanation for assertion.
Lichens are composite, symbiotic organisms made up from members of as many as three kingdoms. The dominant partner is a fungus. Fungi are incapable of making their own food. They usually provide for themselves as parasites or decomposers.
They are sensitive to contaminants like SO2 present in air. Lichens grow in the leftover spots of the natural world that are too harsh or limited for most other organisms. They are pioneers on bare rock, desert sand, cleared soil , dead wood, animal bones, rusty metal, and living bark. Able to shut down metabolically during periods of unfavorable conditions, they can survive extremes of heat, cold, and drought.
Lichens are composite, symbiotic organisms made up from members of as many as three kingdoms. The dominant partner is a fungus. Fungi are incapable of making their own food. They usually provide for themselves as parasites or decomposers.
They are sensitive to contaminants like SO2 present in air. Lichens grow in the leftover spots of the natural world that are too harsh or limited for most other organisms. They are pioneers on bare rock, desert sand, cleared soil , dead wood, animal bones, rusty metal, and living bark. Able to shut down metabolically during periods of unfavorable conditions, they can survive extremes of heat, cold, and drought.
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