What is the correct sequential order of the process of phagocytosis and intracellular digestion in *Amoeba proteus* from initial contact to waste removal?
- 1Extension of pseudopodia around the food particle to form a food cup and enclose it in a food vacuole.
- 2Fusion of lysosomal vesicles with the food vacuole to release hydrolytic digestive enzymes.
- 3Diffusion of digested, soluble nutrients across the vacuolar membrane into the surrounding cytoplasm.
- 4Egestion of indigestible waste through the plasma membrane as the vacuole fuses with the outer surface.
Answer
The correct sequence begins with the extension of pseudopodia around the food particle to enclose it in a vacuole, followed by the fusion of lysosomes to release digestive enzymes, then the diffusion of digested nutrients into the cytoplasm, and ends with the egestion of indigestible waste at the cell surface.
In Amoeba proteus, holozoic nutrition follows five clear physiological phases: ingestion (pseudopodial engulfment), digestion (lysosomal enzyme secretion into the food vacuole), absorption (diffusion of nutrients into cytoplasm), assimilation, and egestion (exocytosis of solid waste). Placing pseudopodial engulfment first, lysosomal fusion second, nutrient diffusion third, and waste elimination last reflects the true sequence.
Step-by-Step Solution
Key Concept
Holozoic Nutrition and Phagocytosis in Sarcodina (Amoeba)
Estimated Time:1m 0s