ANIMAL PHYSIOLOGY
GAS EXCHANGE IN DIFFERENT ANIMALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Exhaled air will not change the colour of hydrogencarbonate indicator.
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Exhaled air turns hydrogencarbonate indicator from yellow to red.
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Exhaled air turns hydrogencarbonate indicator from red to yellow.
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Exhaled air turns hydrogencarbonate indicator from red to purple.
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Detailed explanation-1: -Hydrogencarbonate indicator (HCI) is a pH indicator which can be used to measure the concentration of carbon dioxide over a range of pH values. HCI is orange/red in equilibrium with air and becomes increasingly yellow as the concentration of CO2 increases (the solution becomes more acidic).
Detailed explanation-2: -Complete answer: Exhaled air mainly consists of more amount of carbon dioxide and less oxygen as carbon dioxide is considered as a waste product in the body and thus, the body eliminates it during the process of respiration.
Detailed explanation-3: -When the carbon dioxide content is higher than 0.04%, the initial red colour changes to yellow as the pH becomes more acidic. If the carbon dioxide content is lower than 0.04%, it changes from red to magenta and, in relatively very low carbon dioxide concentrations, to purple.
Detailed explanation-4: -In turn, exhaled air contains: nitrogen – 78% oxygen – 17% carbon dioxide – 4%