Biology
Which of the following is the main substrate for any kind of respiration ?
- Starch
- Oxygen
- Glucose
- Sucrose
Plants Respiration
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Answer
Glucose
Reason — Glucose is the simplest sugar. Any sugar first breaks to form glucose, which further breaks down to release energy.
Starch is a storage carbohydrate. It must first be broken down into glucose before it can be used in respiration. Oxygen is not a substrate; it is a reactant in aerobic respiration that helps release energy, but it is not the fuel. Sucrose is a sugar, but it must first be broken down into glucose and fructose before entering respiration.
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