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Question
Manu lived in a city with heavy traffic, factories, noisy airports etc. To take a break from the daily life, he left for his grandma's village.There, a grey powdery structure in rocks and bark of trees caught his attention. He has never seen such a thing in the busy streets of his city.
What could these structures be?
Manu lived in a city with heavy traffic, factories, noisy airports etc. To take a break from the daily life, he left for his grandma's village.There, a grey powdery structure in rocks and bark of trees caught his attention. He has never seen such a thing in the busy streets of his city.
What could these structures be?
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Solution
The correct option is B Lichens
The white structures that he saw were lichens, which is a bio indicator which indicates undesirable changes in the environment. They don't grow so well when sulphur dioxide content is high in air due to pollution. So they are found on the rocks and barks of trees in a pollution-free village environment. The absence of lichens indicates that the air is polluted.
The white structures that he saw were lichens, which is a bio indicator which indicates undesirable changes in the environment. They don't grow so well when sulphur dioxide content is high in air due to pollution. So they are found on the rocks and barks of trees in a pollution-free village environment. The absence of lichens indicates that the air is polluted.
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