Assertion : Some bacteria have the capacity to retain Gram stain after treatement with acid alcohol.
Reason : They are known as Gram positive as they are attracted towards positive pole under influence of electric current.

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false

Answer

C

Explanation

To differentiate bacterial species based on their cell wall gram staining is used. The bacterial cells with crystal violet dye that impart purple colour to all cells. Then bacteria are treated with iodine that function as mordant. Dip in ethyl alcohol that decolourises stain.
After this step some bacteria retain the purple colour while some other loose purple colour. Bacteria that retain colour are classified as gram positive and bacteria that lose the color after decolourisaton are classified as Gram negative.