Q.2 Which of the following cellular organelle is called as digestive tract of the cell ?
I. Golgi apparatus
2. Peroxisomes
3. Nucleus
4. Lysosomes
Lysosomes are known as the digestive tract of the cell due to their role in breaking down waste, macromolecules, and foreign materials using hydrolytic enzymes. This function aligns perfectly with the question’s options.
Option Analysis
Golgi apparatus modifies, sorts, and packages proteins and lipids into vesicles for secretion or use within the cell. It acts more like a post office than a digestive system.
Peroxisomes handle fatty acid breakdown and detoxification via oxidative reactions, producing hydrogen peroxide. They focus on specific metabolic cleanup, not general digestion.
Nucleus houses genetic material and controls cellular activities through transcription. It has no digestive role whatsoever.
Lysosomes is the correct answer. These single-membraned organelles contain over 50 acid hydrolases that degrade proteins, lipids, carbs, and nucleic acids in an acidic environment (pH ~5), processing endocytosed materials, autophagocytosed organelles, and debris—earning them the “digestive tract” nickname.
The cellular organelle called digestive tract of the cell is the lysosome, a powerhouse for intracellular breakdown. It digests everything from bacteria to worn-out organelles, maintaining cellular homeostasis.
Lysosome Structure
Spherical sacs (0.1–1.2 μm) bounded by a single membrane protect the cytoplasm from ~50 hydrolytic enzymes active at acidic pH. Formed from Golgi-derived vesicles, they fuse with endosomes or autophagosomes for digestion.
Key Functions
Lysosomes perform phagocytosis digestion, autophagy (self-eating), and endocytosis breakdown, recycling nutrients. They also aid apoptosis and antigen presentation, with defects causing lysosomal storage diseases like Tay-Sachs.
| Organelle | Primary Role | Enzymes | “Digestive” Fit |
|---|---|---|---|
| Lysosomes | Macromolecule degradation | Hydrolytic (acidic pH) | Yes – full digestive tract |
| Golgi Apparatus | Protein packaging | Glycosyltransferases | No |
| Peroxisomes | Fatty acid oxidation | Oxidases | Partial (specific) |
| Nucleus | Gene regulation | None | No |
Exam Insights
In competitive biology tests, cellular organelle called digestive tract of the cell highlights lysosomes’ catabolic supremacy over packaging (Golgi) or control (nucleus) roles.
