In Amoeba, nutrition is

The correct option is Holozoic.

To understand why this is the correct answer, let us break down the different modes of nutrition and see how nutrition occurs in Amoeba:
1. Holozoic nutrition: This is a method of heterotrophic nutrition where an organism ingests solid or liquid organic matter. Once inside the body, the food is digested, absorbed, and assimilated to provide energy, and the undigested waste is egested. Examples include humans, dogs, and Amoeba.
2. Saprobic (Saprotrophic) nutrition: In this mode, organisms feed on dead and decaying organic matter by releasing enzymes outside their body and absorbing the liquefied nutrients (e.g., fungi).
3. Parasitic nutrition: In this mode, an organism lives on or inside another host organism and derives nutrients at the host's expense without killing it immediately (e.g., tapeworms, plasmodium).
4. Holophytic (Autotrophic) nutrition: In this mode, organisms synthesize their own food using inorganic substances like carbon dioxide, water, and sunlight (e.g., green plants).

In the case of Amoeba, a unicellular organism, nutrition proceeds through the following holozoic steps:
⇒ Ingestion: Amoeba uses its temporary finger-like projections called pseudopodia to engulf food particles (like microscopic algae or bacteria) forming a food vacuole.
⇒ Digestion: Inside the food vacuole, digestive enzymes break down the complex food substances into simpler, soluble molecules.
⇒ Absorption & Assimilation: The digested food diffuses directly into the cytoplasm and is utilized for growth, maintenance, and energy production.
⇒ Egestion: The undigested waste materials are sent to the cell membrane, which ruptures to release them outside the cell.

Since Amoeba ingests solid food particles, digests them internally, and eliminates waste, its mode of nutrition is strictly Holozoic.