To solve the question, we need to match each technique in Column I with its correct application in Column II.
Let's go through each option:
A. PCR - DNA Amplification: PCR (Polymerase Chain Reaction) is used for amplifying DNA sequences. Thus, it matches with 1 in Column II.
B. Western blot - Protein Detection: Western blotting is a technique used to detect specific proteins in a sample. Therefore, it matches with 2 in Column II.
C. Northern blot - RNA Detection: Northern blotting is used to detect RNA sequences. Hence, it corresponds to 3 in Column II.
D. Southern blot - DNA Detection: Southern blotting is a method used for detecting specific DNA sequences. Thus, it matches with 4 in Column II.
From this analysis, the correct matching is:
A-1, B-2, C-3, D-4
This confirms that the correct answer is indeed: A-1, B-2, C-3, D-4.