Question

10. In simple staining, the colour of Cocci is ……

(a) Blue (b) Red (c) Colourless (d) Pink​

Answer 1

Answer:

In simple staining , the colour of cocci is .....

• crystal violet ( blue)

so, 1st option is right .

Answer 2

The correct answer is option (a) Blue.

Explanation:

• In simple staining, the colour of Cocci is Blue.
• Simple stains use basic dyes which are positively charged.
• These positive dyes interact with the slightly negatively charged bacterial cell wall thus lending the color of the dye to the cell wall.
• The slide to the right shows a cocci that has been stained with crystal violet.
• This shows Gram-positive (purple/blue) cocci, and a scattering of Gram-negative (red) cocci.
• The organism that most commonly infects the skin is staphylococcus aureus, and the younger organisms stain Gram-positive, and the older organisms are sometimes Gram-negative.