Good quality food will perform the following functions in human except

Analyze the question: We are asked which function a good quality (balanced) diet does NOT perform. So three options are real functions of food, and one is not.

Explain the concept: Food provides nutrients that do the following:

• Carbohydrates and fats supply energy.
• Proteins support growth and repair of tissues.
• Vitamins, minerals and water help maintain health and regulate body processes.
• A good diet also strengthens the immune system in a general way, helping the body fight infections.

Step-by-step solution:

• A. Supplying energy: True. Carbohydrates, fats and proteins release energy through respiration.
• B. Providing resistance against malaria: Not a function of food. Malaria is caused by the Plasmodium parasite, which is transmitted by the female Anopheles mosquito. Food does not give specific resistance to it. Protection comes from mosquito nets, insecticides, antimalarial drugs and clearing stagnant water. Good nutrition may help the body cope with illness generally, but it does not provide resistance against malaria itself.
• C. Maintaining health: True. Vitamins and minerals prevent deficiency diseases such as scurvy, rickets and anaemia.
• D. Sustaining growth: True. Proteins and minerals (e.g. calcium) build body tissues, bones and teeth.

Correct answer: B. Providing resistance against malaria

Exam tip: In "except" questions, find the three statements that are clearly true and eliminate them. The leftover one is your answer. Remember that food functions are: energy, growth, repair, protection (general) and regulation. Disease-specific resistance comes from immunity, vaccines or drugs, not from food.