CBSE Questions for Class 6 Biology Components Of Food Quiz 2 - MCQExams.com

• Scurvy is a disease caused by severe and chronic vitamin C (ascorbic acid) deficiency. 
• Symptoms include feeling generally unwell and bleeding gums. Babies and young children can suffer complications from scurvy including stunted bone growth. Good dietary sources of vitamin C include citrus fruits and green vegetables.
  Hence, correct option is C.

• Soya bean, pea and meat are major sources of proteins.
• Proteins help in the growth of the body and in the repair of body cells.
• Butter is a major source of fats.

$$\textbf{Correct answer: C}$$ 

$$\textbf{Option (A):}$$ 

$$\bullet$$ Hormones are produced in the endocrine glands present in the human body. 

$$\bullet$$ It does not require external supply through a specific diet as that of the nutrients.

$$\textbf{Option (B):}$$ 

$$\bullet$$ Meat, milk and eggs are not specific sources of carbohydrates. 

$$\bullet$$ It may be present in trace amounts but not as the main nutrient. 

$$\textbf{Option (C):}$$ 

$$\bullet$$ Meat, milk and egg are included in the diet as rich sources of protein. 

$$\bullet$$ The protein present in meat is the animal protein containing all the essential amino acids. 

$$\bullet$$ Milk protein casein is an important source of protein in both infants and adults. 

$$\bullet$$ Egg albumin is one of the chief sources of protein in a healthy diet. 

$$\textbf{Option (D):}$$ 

$$\bullet$$ All the elements have a limited level of fats in them. But it can not be considered as the chief nutrient from such food. 

Hence, the correct answer is option (C).

Sources of dietary proteins are fish, milk (dairy products), eggs, seeds and nuts, beans and legumes, etc. Hence, milk, fish, vegetables and pulses are rich in proteins.

Proteins are required by our body for muscle building and repairing worn-out tissues. Our muscles, organs, and even blood are made up mostly of proteins.

So, the correct answer is 'proteins'.

• Almonds are rich in protein, healthier fats, and fibres.
• Rice is rich in carbohydrates.
• Butter is rich in vitamins and fat.
• Soyabean is a rich source of carbohydrates, proteins as well as fats. The 100g serving of soybean consists of 17g protein, 1g of saturated fat, 10g of carbohydrate, and 6g of fibre. 
• So, the correct answer is option C.

• Raw potato contains approximately 17% starch. 
• When iodine solution is added to the raw potato sample, it turns blue-black. Iodine reacts with the starch present in the raw potato which results in the formation of a blue-black coloured complex. 

• When two drops of copper sulphate and ten drops of caustic soda or NaOH is added to the egg, it turns violet. This indicates the presence of proteins.
• This is Biuret's test and the principle is simple as follows:
• In the presence of alkaline medium (caustic soda or NaOH), the $$Cu^{2+}$$ ions get reduced to $$Cu^+$$ and binds to the egg proteins, thereby giving a violet colour.

$$\textbf{Correct answer: C}$$ 

$$\textbf{Option (A):}$$ 

$$\bullet$$ Amla is a rich source of vitamin C and so it needs to be included in the diet. 

$$\textbf{Option (B):}$$ 

$$\bullet$$ Guava is a rich source of vitamin C making it another essential fruit that can be included in the diet.

$$\textbf{Option (C):}$$ 

$$\bullet$$ Therefore both amla and guava are suitable for a person having breathing gums. 

$$\textbf{Option (D):}$$ 

$$\bullet$$ Milk is rich in vitamin D and Calcium which are required mainly to provide proper bone growth.

$$\bullet$$ In the conditions like osteoporosis or tickets, there is a requirement for milk in the diet. 

Hence, the correct answer is option (C).