Question

The obilique and oarallely arranged strips which are responsible for metaboly are present in
A. Flagella
B. Paraflagellar body
C. Cytoplasm
D. Pellicle

Answer 1

Hint: Euglenoids are one of the best-known groups of flagellates, which are excavated eukaryotes of the phylum euglenophyte and their cell structure is typical of that group. They are commonly found in freshwater, especially when it is rich in organic materials, with a few marine and endosymbiotic members.
Many euglenids feed by phagocytosis, or strictly by diffusion.

Complete answer: The body of euglenoids are covered by a thin pellicle, that has oblique but parallelly arranged stripes. It provides the flexibility to cause temporary changes in body shape. The pellicle strips slide over one another to help in metabolic.
The pellicle gives some shape to the cell, especially during locomotion.
Pellicles of protozoan organisms vary from flexible and elastic to fairly rigid.
In ciliates and apicomplexan, the pellicle is supported by closely packed vesicles called alveoli.

In euglenids, it is formed from protein strips arranged spirally along the length of the body. Familiar examples of protists with a pellicle are the euglenoids and the ciliate paramecium.
In some protozoa, the pellicle hosts epibiotic bacteria that adhere to the surface by their fimbriae.
A monophyletic group consisting of the mixotrophic Rapaza Viridis (1 species) and the two groups Eutreptiales (24 species) and Euglenales (983 species) have chloroplast and produce their own food through photosynthesis.
This group is known to contain the carbohydrate paramylon.

So the correct answer is- D. Pellicle

Note: Unlike plants, fungi and most types of algae, protozoans do not typically have a rigid cell wall, but are usually enveloped by elastic structures of membranes that permit movement of the cell. In some protozoans, such as the ciliates and euglenozoans, the cell is supported by a composite membranous envelope called the "pellicle".