Match the following columns:
Column-$I$ Column-$II$
$A$. Halophiles $i$. Gram-negative bacteria
$B$. Thermoacidophiles $ii$. Extremely salty areas
$C$. Spirochetes $iii$. Responsible for methane production
$D$. Firmicutes $iv$. Acidic and high temperature environments
$v$. Gram-positive bacteria

  • A
    $A-i, B-ii, C-iii, D-iv$
  • B
    $A-v, B-iv, C-iii, D-ii$
  • C
    $A-ii, B-iv, C-i, D-v$
  • D
    $A-ii, B-iv, C-iii, D-v$

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$S$ - Statement: Bacteria are divided into two groups based on the staining procedure developed by Gram.
$R$ - Reason: Bacteria that take up the Gram stain are called Gram-negative.

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