A - Loss of biodiversity in a region may lead | vedclass

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(D) According to David Tilman's long-term ecosystem experiments,communities with more species generally show less year-to-year variation in total biom

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$A$ is incorrect and $R$ is correct.

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(D) According to David Tilman's long-term ecosystem experiments,communities with more species generally show less year-to-year variation in total biomass.Increased diversity contributes to higher productivity.Therefore,the loss of biodiversity leads to a decrease in plant production,not an increase.Thus,statement $A$ is incorrect.Ecological studies have shown that stable communities are resistant to occasional disturbances (natural or man-made) and invasions by alien species.Loss of biodiversity makes an ecosystem less stable and more vulnerable to environmental perturbations such as drought.Thus,statement $R$ is correct.

Column-$I$	Column-$II$
$(A)$ Endemism	$(i)$ Khasi and Jaintia hills,Meghalaya
$(B)$ Hotspot of India	$(ii)$ Advanced ex-situ conservation
$(C)$ Sacred groves	$(iii)$ Species found in a particular area only
$(D)$ Cryopreservation	$(iv)$ Zoological park and botanical garden
$(E)$ Ex-situ conservation	$(v)$ Western Ghats

$A$ - Loss of biodiversity in a region may lead to an increase in plant production.
$R$ - Loss of biodiversity in a region may lead to lowered resistance to environmental perturbations such as drought.

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$A$: Western Ghats are included among the hot spots of biodiversity.
$R$: Western Ghats have greater amphibian diversity than Eastern Ghats.

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On behalf of endangered species and habitats,why are conservationists calling for immediate and often expensive action?

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$A$ - Loss of biodiversity in a region may lead to an increase in plant production.$R$ - Loss of biodiversity in a region may lead to lowered resistance to environmental perturbations such as drought.