Question

Which type of reaction is respiration ?

• A. Combination
• B. Reduction
• C. Endothermic
• D. Oxidation

Hint:

Remember that respiration is an exothermic process because it releases energy. It is also considered an oxidation process because food molecules are broken down using oxygen.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Cellular respiration is the metabolic process by which organisms obtain energy from food (like glucose). The overall chemical reaction is:
\[ C_6H_{12}O_6 \text{(glucose)} + 6O_2 \text{(oxygen)} \rightarrow 6CO_2 \text{(carbon dioxide)} + 6H_2O \text{(water)} + \text{Energy (ATP)} \]

Step 2: Detailed Explanation:
Let's analyze the reaction type: \[\begin{array}{rl} \bullet & \text{In this process, glucose (\(C_6H_{12}O_6\)) reacts with oxygen and is broken down into carbon dioxide. This breakdown by reaction with oxygen is a form of oxidation.} \\ \bullet & \text{Since energy is released during this process, it is an exothermic reaction, not endothermic (which absorbs heat).} \\ \bullet & \text{It is not a combination reaction, as one complex reactant breaks down. It is a type of combustion reaction.} \\ \bullet & \text{While it is a redox reaction (oxygen is reduced), the primary process concerning the fuel (glucose) is oxidation.} \\ \end{array}\] Given the options, oxidation is the most accurate description of what happens to the food molecule to release energy.

Step 3: Final Answer:
Respiration is a type of oxidation reaction.