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Fats are used as respiratory substrates by a number of organisms because they contain more energy as compared to carbohydrates.

1. Fats are used as respiratory substrates by a number of organisms because they contain more energy as compared to carbohydrates.
2. Fats are used as respiratory substrates by a number of organisms because they contain less energy as compared to carbohydrates.
3. Fats are used as respiratory substrates by a number of organisms because they contain the same energy as carbohydrates.
4. Fats are not used as respiratory substrates by any organism.

Correct answer: Fats are used as respiratory substrates by a number of organisms because they contain more energy as compared to carbohydrates.

Solution

Fats have more carbon-hydrogen bonds and are more reduced than carbohydrates, so their oxidation releases more energy. That is why many organisms use fats as respiratory substrates when a high-energy reserve is needed.

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