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(B) The rate of aerobic respiration is directly dependent on the concentration of oxygen available in the environment.When oxygen levels drop signific

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(B) The rate of aerobic respiration is directly dependent on the concentration of oxygen available in the environment.When oxygen levels drop significantly,such as to $1\%$,the aerobic respiration process is severely inhibited because oxygen acts as the final electron acceptor in the electron transport chain.Consequently,at such low concentrations,the rate of respiration decreases to its minimum level,as the cell may shift towards anaerobic pathways or simply slow down metabolic activity due to the lack of sufficient oxygen.

Column-$I$	Column-$II$
$a.$ Cis-aconitate	$i.$ $4 \ C$-compound
$b.$ $\alpha$-ketoglutarate	$ii.$ $3 \ C$-compound
$c.$ Fumarate	$iii.$ $6 \ C$-compound
$d.$ $1,3$-diphosphoglyceric acid	$iv.$ $5 \ C$-compound

If oxygen content is reduced to $1\%$,the rate of respiration becomes

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Match Column-$I$ with Column-$II$ and select the correct option.
Column-$I$ Column-$II$
$a.$ Cis-aconitate $i.$ $4 \ C$-compound
$b.$ $\alpha$-ketoglutarate $ii.$ $3 \ C$-compound
$c.$ Fumarate $iii.$ $6 \ C$-compound
$d.$ $1,3$-diphosphoglyceric acid $iv.$ $5 \ C$-compound

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