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STD 11 - 8. Cell the unit of life — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 8. Cell the unit of life1 Mark
MCQ
Select the wrong statement.
  • A
    Bacterial cell wall is made up of peptidoglycan.
  • ✓
    Pili and fimbriae are mainly involved in motility of bacterial cells.
  • C
    Cyanobacteria lack flagellated cells.
  • D
    Mycoplasma is a wall­less microorganism.
✓

Answer

Correct option: B.
Pili and fimbriae are mainly involved in motility of bacterial cells.
b
(b) : Pili and fimbriae are bacterial appendages which are not involved in locomotion. Actually, pili are long fewer and thicker tubular outgrowths which develop in response to $F^+$ or fertility factor in Gram negative bacteria. Being long they are helpful in attaching to recipient cell and forming conjugation tube. Fimbriae are small bristle­like fibres sprouting from cell surface in large number. There are $300-­400$ of them per cell. They are involved in attaching bacteria to solid surfaces.

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Column-$I$ (Terms) Column-$ll$ (Examples)
$A$. Ascus $I$. Spirulina
$B$. Basidium $II$. Penicillium
$C$. Protista $III$. Agaricus
$D$. Cyanobacteria $IV$. Euglena
$E$. Animalia $V$. Sponges

Match the terms given in column-$I$ with their examples given in column-$II$ and choose the correct option

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