Question

What is the safest way to test another 2 cm piece of onion leaf for the presence of reducing sugar?

A) Cut the leaf and place it in a petri dish with water, then heat the mixture. Add Benedict's solution and heat again. If the solution turns orange-red, reducing sugar is present.

B) Cut the leaf and place it directly into Benedict's solution. If the solution turns orange-red, reducing sugar is present.

C) Crush the leaf and mix it with water. Filter the mixture and add iodine solution. If the solution turns blue-black, reducing sugar is present.

D) Cut the leaf and place it in a beaker with alcohol. Heat the mixture and add iodine solution. If the solution turns blue-black, reducing sugar is present.

Answer 1

The safest way to test another 2 cm piece of onion leaf for the presence of reducing sugar is to cut the leaf and place it directly into Benedict's solution. If the solution turns orange-red, reducing sugar is present.

Step-by-step explanation:

The safest way to test another 2 cm piece of onion leaf for the presence of reducing sugar is to Option B: cut the leaf and place it directly into Benedict's solution. If the solution turns orange-red, reducing sugar is present. This method is safe because it does not involve heating or the use of other hazardous chemicals. Benedict's solution is a commonly used reagent that contains copper ions, which can be reduced by reducing sugars to form a red color precipitate.