Which one of the following processes in the bodies of living organisms is a digestive process?

Digestion is the mechanical and chemical breakdown of ingested food into small absorbable units. Proteins are hydrolysed by digestive enzymes secreted in the stomach, pancreas and the small intestine to yield peptides and ultimately amino acids, which are then absorbed [2]. Hence, “breakdown of proteins into amino acids” is a digestive process. In contrast, the breakdown of glucose to CO2 and H2O is cellular respiration — an intracellular metabolic catabolic pathway for energy release, not a digestive step [3]. Conversion of glucose to glycogen (glycogenesis) and assembly of amino acids into proteins are anabolic, metabolic/storage or biosynthetic processes rather than digestion.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > Activity 5.3 > p. 86
2. [2] Science-Class VII . NCERT(Revised ed 2025) > Chapter 9: Life Processes in Animals > Stomach > p. 125
3. [3] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > Activity 5.5 > p. 87