NEET BIOLOGY

Detailed explanation-1: -Pellicle. Euglena and all of the euglenids are characterized by the presence of a unique cell covering known as the pellicle. This pellicle is a complex structure consisting of a proteinaceous layer or ‘membrane skeleton’ that is underlain by microtubules and covered by the plasma membrane of the cell.

Detailed explanation-2: -Euglena gracilis is a photosynthetic flagellate possessing chlorophyte-derived secondary plastids that are enclosed by only three enveloping membranes, unlike most secondary plastids, which are surrounded by four membranes.

Detailed explanation-3: -Presence of pellicle is the characteristic feature of Euglenoids. Pellicle is the complex structure consisting of proteinaceous layer. It is covered by plasma membrane of cell. It is a protective covering of euglenoids.

Detailed explanation-4: -Unlike plant cells, Euglena lack a rigid cellulose wall and have a flexible pellicle (envelope) that allows them to change shape.