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(A) According to the $NCERT$ textbook for Class $12$ Biology (Chapter: Environmental Issues),at the beginning of the twentieth century,forests covered

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(A) According to the $NCERT$ textbook for Class $12$ Biology (Chapter: Environmental Issues),at the beginning of the twentieth century,forests covered about $30\%$ of the land area of India.By the end of the twentieth century,this had shrunk to $21.54\%$,whereas the National Forest Policy $(1988)$ of India has recommended $33\%$ forest cover for the plains and $67\%$ for the hills.

Column-$I$	Column-$II$
$(a)$. Pyrolysis	$(i)$. Methaemoglobinemia
$(b)$. Carbon monoxide	$(ii)$. Chronic exposure to arsenic
$(c)$. Blue baby syndrome	$(iii)$. Asphyxia and giddiness
$(d)$. Black foot disease	$(iv)$. Disposal of hospital waste

At the beginning of the twentieth century,forests covered about ........... of the land area of India. (in $\%$)

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$(a)$. Pyrolysis $(i)$. Methaemoglobinemia

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