R.Q is maximum when respiratory substrate is

Glucose

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Fat

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Protein

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Malic acid.

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Solution

The correct option is D Malic acid.
When organic acids break down into respiratory substrates in aerobic conditions the respiratory quotient is maximum.
Ex: C $_{4}$ H $_{6}$ 0 + 3 0 $_{2}$ gives 4C0 $_{2}$ + 3H $_{2}$ 0 RQ = 4 C0 $_{2}$ /3 0 $_{2}$ or 1.3 malic acid.
So, the correct option is 'Malic acid'.

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When fats are the respiratory substrate, the value of RQ would be

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