Question

Locomotory structure of Amoeba is
A. Cilia
B. Flagella
C. Pseudopodia
D. None of the above

Answer 1

Hint: Amoeba is a large genus (Amoeba) of naked protozoa rhizopoda with lobed and without permanent organs or supporting structures and widely distributed in fresh and salt water and humid terrestrial environments.

Complete Answer:
- There are several amoebas with parasites. Amebic dysentery is caused by Entamoeba histolytica of six species present in the human food tract.
- Acanthamoeba and Naegleria, strains of which have been recognised as disease-causing parasites in many vertebrates , including humans, are two related free-living genera of growing biomedical significance.
- Amoebas are known by their capacity to form temporary cytoplasmic extensions called pseudopodia, or false feet, through which they pass. The most basic form of animal locomotion is known to be this sort of movement, called amoeboid movement.
- Amoebas are used widely for the assessment of the relative roles and interactions of the nucleus and cytoplasm in cell science. Every ameba contains a small mass of jellylike cytoplasm separated into a thin outer plasma membrane, a transparent, rigid ectoplasm layer just inside the plasma membrane, and a granular central endoplasm.
- There is no mouth or anus in the ameba; food is taken in and material is excreted at every point on the surface of the cell. Cytoplasm extensions flow around food particles during feeding, covering them and creating a vacuole into which enzymes are secreted in order to digest the particles.

The correct Answer is option (C) Pseudopodia.

Note: Many amoebas live by encystment during adverse environmental periods: the ameba becomes spherical, loses much of its water, and secretes a cyst membrane that acts as a protective covering. The envelope ruptures when the atmosphere is ideal again, and the amoeba emerges.