Test for Carbohydrates

Q.

A positive Seliwanoffs test is obtained with?

1. Glucose

2. Fructose

3. Galactose

4. Mannose

Q. Which of these changes the colour of starch to blue black?

1. Lime water
2. Iodine solution
3. Methylated solution
4. Benedict's solution

Q. A green leaf that has fallen down from a plant is taken and is kept in hot water for sometime and then taken out. It is then dipped in spirit and iodine solution. The leaf turns bluish indicating the presence of ___.

1. protein
2. starch
3. fats
4. carbohydrates

Q.

The confirmation of starch can be done by using:

1. Iodine

2. Copper sulphate solution

3. Caustic soda

4. All of the above

Q.

What is the procedure for testing a food item for fat content? [5 MARKS]

Q. Sam conducted an experiment in which a blue coloured solution 'A' was added to the solution to be tested. It changed the colour of the solution to brick red due to the presence of glucose. Identify 'A'.

1. Iodine
2. Biuret solution
3. Starch
4. Benedict's solution

Q. ___ solution is used to test the presence of starch.

1. Copper sulphate
2. Iodine
3. Sodium hydroxide
4. Tartaric acid

Q. Which one of the following is the combination of relevant materials required for setting up an experiment to show that light is necessary for photosynthesis?

1. Destarched leaves, strips of black paper, starch solution and iodine crystals
2. A potted plant, strips of coloured of coloured paper, starch solution, iodine and potassium iodide
3. Strips of black paper, starch solution, destarched leaves and potassium iodide
4. Strips of black paper, destarched potted plant and iodine solution

Q. Foods rich in starch turnsin colour, when treated with iodine solution.

1. orange
2. pink
3. green
4. blue-black

Q. The process of photosynthesis takes place in _______.

1. Leaf cells only
2. Root cells only
3. Both A and B
4. All cells of the plant