Discussion
Following devised the starch-iodine test to determine the presence of semen
Answer: C
The key credits Roberts with devising the starch-iodine test for the presence of semen. Willott, E.M. Southern and Ouchterlony are known for other things: Southern for the Southern blot technique in DNA analysis, and Ouchterlony for the double diffusion method in immunology. The answer is C. The test gives a blue-black colour when iodine acts on starch, and it was proposed as a presumptive test for semen on the basis of the starch-iodine reaction. A presumptive test shows only that a stain may be semen and must be followed by a confirmatory test, such as demonstration of spermatozoa or the P30 test.
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