Question

Respiration is a catabolic process due to
A. Breakdown of complex food molecules
B. Conversion of sunshine energy
C. Synthesis of energy
D. Energy storage

Answer 1

The lungs and systema respiratorium allow us to breathe. They carry oxygen into our bodies (called inspiration, or inhalation) and send $CO_2$ out (called expiration, or exhalation). This exchange of oxygen and $CO_2$ is called respiration.

Complete answer:
Cellular respiration may be a catabolic process during which glucose is catabolized to release usable energy for a cell. As altogether catabolic processes, respiration releases energy which may then be harnessed and employed by other reactions within the cell.
During Respiration, complex food molecules (mostly glucose) are catabolized into smaller and straightforward ones to release usable energy for a cell. Thus, respiration is a catabolic process. Option 'A' is correct.
Catabolic process is that process, which breaks down large molecules into smaller units that are either oxidized to release energy or utilized in other metabolic reactions. Respiration may be a process, where sugars and fats are metabolized for energy. So, Respiration may be a catabolic process.
Catabolism is the process of breakdown of any large substance into smaller ones. In respiration, glucose is catabolized into $CO_2$ and water molecules. Thus it's mentioned as a catabolic reaction.

Hence, Option 'A' is the correct answer.

Note:
When you're during a catabolic state, you're breaking down or losing overall mass, both fat and muscle. you'll be ready to manipulate your weight by understanding these processes and your overall metabolism. Both the anabolic and catabolic process cause fat loss over time.