Answer ( 1 )

  1. XLD agar id used to inhibit the growth of the gram-positive micro-organisms. XLD act as both selective and differential.

    selective agent in XLD agar is sodium deoxycholate(this don’t support the growth of the gram-positive bacteria ).

    in this media xylose is present that is fermented by bacteria, produce acid and then media colour change into yellow.

    hope you got the point.

    thanks

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