Describe how you would test a sample of powdered milk to see if it contained reducing sugar​

The correct answer is -  Benedict's test.

Explanation:

To test the presence of the reducing sugar in the milk the best test would be Benedict's test with the help of Benedict's reagent or solution which is a mixture of sodium carbonate, copper(II) sulfate pentahydrate, and sodium citrate. It reacts with the reducing sugars and gives a precipitate of cuprous(I) oxide.

R.CHO + Cu(II)(OH)2 > R.COOH + Cu(I)2 O + 2H2O

The presence of reducing sugars results in the oxidation of them by copper iron. This forms carboxylic acid and a reddish ppt. of copper oxide turning the color of solution orange, red or brown

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.