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NEET 2018 · BiologyEubacteriaPrevious Year Question

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.

  1. A.Bacteria cell wall is made up of peptidoglycan
  2. B.Pili and fimbriae are mainly involved in motility of bacterial cells✓
  3. C.Cyanobacteria lack flagellated cells
  4. 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"

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