Question

Match List-I with List-II
List-I (Biocompound):
(A). 2, 4-diacetyl-phloroglucinol
(B). Herbicolin
(C). Zwittermicin A
(D). Xanthobaccin A
List-II (Organism):
(I). Pseudomonas fluorescens
(II). Pantoea agglomerans
(III). Bacillus cereus
(IV). Lysobacter sp.

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

Hint:

Remember that 2,4-DAPG is synonymous with fluorescent pseudomonads (Pseudomonas fluorescens), and Herbicolin stems from "herbicola" (Pantoea agglomerans Erwinia herbicola).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Biological control of plant pathogens relies on antagonistic microorganisms that produce bioactive antimicrobial metabolites.
Identifying these biocompounds and their producing organisms is critical in agricultural biotechnology.

Step 2: Detailed Explanation:
Let us pair each biocompound with its producing organism:
(A) 2,4-diacetyl-phloroglucinol (2,4-DAPG):
This phenolic compound is a well-known antibiotic produced by certain biocontrol strains of Pseudomonas fluorescens.
It exhibits broad-spectrum antifungal activity and plays a major role in suppressing soil-borne diseases like take-all of wheat.
Thus, (A) matches with (I).
(B) Herbicolin:
Herbicolins are lipopeptide antibiotics produced by Pantoea agglomerans (formerly known as Erwinia herbicola).
They are highly active against various yeasts and filamentous fungi.
Thus, (B) matches with (II).
(C) Zwittermicin A:
Zwittermicin A is an aminopolyol antibiotic produced by Bacillus cereus.
It contributes to the biocontrol of oomycete pathogens and enhances the insecticidal activity of Bacillus thurigiensis toxins.
Thus, (C) matches with (III).
(D) Xanthobaccin A:
Xanthobaccin A is an antifungal antibiotic produced by species of the genus Lysobacter (such as Lysobacter enzymogenes).
It suppresses diseases like damping-off of sugar beet caused by Pythium.
Thus, (D) matches with (IV).
The matching sequence is: (A) - (I), (B) - (II), (C) - (III), (D) - (IV).

Step 3: Final Answer:
The correct option is (B).