Which of the following organisms acts as an a | vedclass

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(A) Lichens are considered excellent bio-indicators of air quality,particularly for sulfur dioxide $(SO_2)$ pollution. They do not grow in areas with

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Lichen

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(A) Lichens are considered excellent bio-indicators of air quality,particularly for sulfur dioxide $(SO_2)$ pollution. They do not grow in areas with high levels of air pollution because they absorb nutrients and water directly from the atmosphere through their surface. Therefore,their presence or absence serves as a reliable indicator of the surrounding air quality.

Particles/Microorganisms	Diseases
$(i)$ Viroid	$(a)$ $\text{CJD}$
$(ii)$ Virus	$(b)$ Citrus canker
$(iii)$ Bacteria	$(c)$ Potato spindle tuber disease
$(iv)$ Prion	$(d)$ Mumps

Which of the following organisms acts as an air quality indicator?

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Particles/Microorganisms Diseases

$(i)$ Viroid $(a)$ $\text{CJD}$

$(ii)$ Virus $(b)$ Citrus canker

$(iii)$ Bacteria $(c)$ Potato spindle tuber disease

$(iv)$ Prion $(d)$ Mumps

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