Step 1: Core Concept:
The question seeks to identify the cell organelle involved in intracellular digestion.
Step 2: Breakdown:
Examine the function of each organelle:
\[\begin{array}{rl} \bullet & \text{1. Rough endoplasmic reticulum (RER): Synthesizes and modifies proteins for secretion or membrane insertion.} \\ \bullet & \text{2. Nucleus: Contains the cell's DNA and controls cell growth and reproduction.} \\ \bullet & \text{3. Lysosome: Contains hydrolytic enzymes and functions as the cell's digestive system, breaking down waste, damaged organelles, and foreign material.} \\ \bullet & \text{4. Ribosome: Sites of protein synthesis, using mRNA to build proteins.} \\ \end{array}\]Based on these functions, the lysosome facilitates digestion.
Step 3: Answer:
The lysosome is the primary organelle for digesting food particles.
Given below is the diagram of a turgid plant cell.