Question

Match List-I with List-II regarding bacterial contamination and the type of spoilage in eggs

List-I (Microbes)	List-II (Type of spoilage in eggs)
(A) Serratia marcescens	(I) Green rot
(B) Pseudomonas maltophilia	(II) Black rot
(C) Enterobacter spp	(III) Red rot
(D) Proteus spp.	(IV) Custard rot.

Choose the correct answer from the options given below

• (A) - (I), (B) - (III), (C) - (II), (D) - (IV)
• (A) - (II), (B) - (IV), (C) - (I), (D) - (III)
• (A) - (III), (B) - (I), (C) - (IV), (D) - (II)
• (A) - (I), (B) - (II), (C) - (III), (D) - (IV)

Hint:

To easily recall egg spoilages:
- Serratia = Red rot (due to red prodigiosin pigment).
- Pseudomonas = Green rot (due to fluorescent pyoverdine pigment).
- Proteus = Black rot (due to \(\text{H}_2\text{S}\) production).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Bacterial spoilage in shell eggs occurs when bacteria penetrate the shell pores and grow inside the egg, producing characteristic pigments, gases, and odors.
These spoilages are classified into distinct "rots" based on the appearance of the yolk and albumen.

Step 2: Detailed Explanation:
Let us match each bacterial group with its characteristic type of egg spoilage:
- (A) Serratia marcescens: This bacterium produces a red pigment called prodigiosin, which discolors the albumen and yolk, causing "red rot" in eggs.
This matches with (III).
- (B) Pseudomonas maltophilia (and other Pseudomonas species): These are psychrotrophic bacteria that produce a water-soluble, fluorescent green pigment called pyoverdine, which gives the albumen a characteristic green glow under ultraviolet light, known as "green rot."
This matches with (I).
- (C) Enterobacter spp: These coliform bacteria ferment sugars and produce a yellow, custard-like consistency in the egg yolk and white, causing "custard rot."
This matches with (IV).
- (D) Proteus spp: These anaerobic or facultative bacteria produce hydrogen sulfide (\(\text{H}_2\text{S}\)), which reacts with iron to form black iron sulfide.
This turns the entire contents of the egg black and produces a strong, putrid odor, known as "black rot."
This matches with (II).
Therefore, the correct matching sequence is: (A) - (III), (B) - (I), (C) - (IV), (D) - (II).

Step 3: Final Answer:
The correct matching sequence corresponds to option (C).