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Question

Amoeba acquires its food through a process, termed as


A

Exocytosis

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B

Endocytosis

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C

Plasmolysis

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D

Exocytosis and endocytosis both

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Solution

The correct option is B

Endocytosis


The correct option is B.

Explanation of the correct option:

Option B:

  1. The amoeba is a unicellular organism that mainly lives in marine or aquatic habitats. It obtains its food by a method of holozoic nutrition. The organisms in this mode of nutrition take in solid or liquid food as a whole and digest it inside the body.
  2. The internalization of substances into the cell is known as endocytosis. The material is encircled by the cell membrane before it buds off and forms a vesicle inside the cell.
  3. Endocytosis includes processes like phagocytosis and pinocytosis. Amoeba uses pseudopodia to aid in the endocytosis process by which it consumes its meal.
  4. When a specific molecule in the fluid enveloping cells is linked to specialized receptors in the plasma membrane, endocytosis is mediated by receptors.
  5. The plasma membrane folds inward and creates a vesicle, as observed in pinocytosis.

Explanation of the incorrect options:

Option A:

  1. Exocytosis is the process through which molecules are expelled from an organism's body.
  2. A cell moves molecules out of the cell through an active transport and bulk transport process called exocytosis.
  3. Exocytosis uses energy to move materials because it is an active transport process.

Option C:

  1. When a plant loses water, it experiences plasmolysis, which causes the plant to contract.
  2. Plant cells subjected to hyperosmotic stress frequently exhibit plasmolysis as a reaction.
  3. The live protoplast violently separates from the cell wall as a result of the loss of turgor.
  4. The vacuole is primarily responsible for the plasmolytic process. Living plant cells exhibit plasmolysis, which is reversible (deplasmolysis).

Option D:

  1. Amoeba does not acquire food through both exocytosis and endocytosis.

Final answer: Amoeba acquires its food through a process, termed endocytosis.


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