Holozoic nutrition in protozoa — which statement correctly defines this feeding mode?

Introduction:
Holozoic nutrition describes animal-like feeding. Protozoa with this habit ingest particulate food and digest it intracellularly, analogous to macrophage phagocytosis.

Given Data / Assumptions:

• We must focus on solid vs soluble food and the uptake mechanism.
• Food vacuole formation is central to intracellular digestion.

Concept / Approach:
Holozoic = ingestion of solid particles. Pinocytosis takes up fluids/solutes; photosynthesis is autotrophic, not holozoic. Therefore the accurate description centers on phagocytosis of solids and food vacuole formation.

Step-by-Step Solution:

Verification / Alternative check:
Classic amoebae feed by engulfing bacteria/algae fragments and digesting them in vacuoles; microscopy confirms stepwise phagosome to phagolysosome maturation.

Why Other Options Are Wrong:

• Pinocytosis of solids: solids are not pinocytosed; pinocytosis targets fluids.
• Phagocytosis of soluble nutrients: “soluble” contradicts phagocytosis.
• Photosynthesis: not a feeding mode of holozoic protozoa.

Common Pitfalls:
Confusing pinocytosis with phagocytosis; assuming any vacuole equals food vacuole.

Final Answer:
Phagocytosis of solid nutrients followed by formation of phagocytic (food) vacuoles