Select the wrong statement
Answer: (B) Pili and fimbriae are mainly involved in motility of bacterial cells. Answer: (B) Pili and fimbriae are mainly involved in motility — WRONG Solution: Pili and fimbriae are not motility structures; bacterial motility is by flagellum.
- A.Bacteria cell wall is made up of peptidoglycan
- B.Pili and fimbriae are mainly involved in motility of bacterial cells✓
- C.Cyanobacteria lack flagellated cells
- D.Mycoplasma is a wall – less microorganism
Correct Answer
(B) Pili and fimbriae are mainly involved in motility of bacterial cells
Solution & Explanation
Answer: (B) Pili and fimbriae are mainly involved in motility — WRONG Solution: Pili and fimbriae are not motility structures; bacterial motility is by flagellum. Bacterial cell walls are noncellulosic (polysaccharide + amino acid, i.e. peptidoglycan) (A correct), and Mycoplasma completely lack a cell wall (D correct). Cyanobacteria lacking flagellated cells (C) is treated as correct, making B the wrong statement. NCERT Reference: NCERT Class XI, Biological Classification, p.13, lines 24-25 — "the presence of a rigid cell wall, and if motile, a flagellum"