A student was given the following materials to conduct an experiment. Identify the experiment which may be conducted with these materials. Mat

Question

A student was given the following materials to conduct an experiment. Identify the experiment which may be conducted with these materials.
Materials given:
· Glass beaker
· Test tube
· Potato
· Alcohol
· Milk
· Copper sulphate
· Caustic soda (NaOH}
· Water
· Iodine solution
Experiments:
A. CO₂ is essential for photosynthesis. B. Testing carbohydrates in food. C. CO₂ is released during respiration. D. Testing proteins in food.
Options:

A, B and D

B, C and D

C, D only

B, D only

Solution

Correct option is D

Correct Answer: (d)
Explanation
Let's check each experiment:
· A. CO₂ is essential for photosynthesis This experiment requires a plant, KOH, bell jar, etc., which are not provided.
· B. Testing carbohydrates in food Iodine solution is used to test starch (carbohydrate} in potato.
· C. CO₂ is released during respiration This requires germinating seeds and lime water/KOH, which are not available.
· D. Testing proteins in food Copper sulphate + Caustic soda (NaOH} are used in the Biuret test for proteins (e.g., milk}.
Hence, only B and D can be conducted.
Additional Information
Food Tests

Nutrient	Reagent	Positive Result
Starch	Iodine solution	Blue-black colour
Protein	CuSO₄ + NaOH (Biuret test}	Violet/Purple colour
Fat	Brown paper/Sudan III	Translucent spot or red stain
Glucose	Benedict's/Fehling's solution	Brick-red precipitate