Answer: Option D. -> Both vinegar and salt
:
D
$\bullet$Preservatives are the substancesthat are generally added to kill or inhibit the growth of microorganisms in a food item.
$\bullet$Common salt(NaCl) and sugar are natural preservatives, vinegarand sodium benzoateare chemical preservatives.
$\bullet$Common salt removes the water content in the pickled mangoes. In the absence of water, bacteria can't multiply and hence itact as a preservative.
$\bullet$ Similarly, fishermen add saltto fish to keep them fresh for a longer period of time.

Answer: Option A. -> Night Blindness
:
A
Night blindness is caused by lack of vitamins. Ketosis is caused by lack of carbohydrates. Kwashiorkor is caused by lack of proteins.
Obesity is a life-style disease.

Answer: Option C. -> mineral
:
C
Iron is an important part of the haemoglobin molecule. Haemoglobin in the red blood cells is responsible for carryingoxygen from the lungs to different parts of the body.

Answer: Option A. -> lemon
:
A
Scurvy is caused by lack of vitamin C. Orange, lemon are rich in vitamin C.Rice, wheat, millet are cereals, they do not contain vitamin C.

Answer: Option D. -> Egg
:
D
Chicken, egg, cottage cheese etc. are all richsources of protein. These items provide strength tothe body. Apples are rich in fibre.Cabbage is rich in vitamins.

Answer: Option A. -> water
:
A
The process of addition of another substance in food items which degrade the quality of the food is known as adulteration. Milk is usually adulterated by adding water.

Answer: Option B. -> False
:
B
Fats provide us with energy but it is good only if consumed in proper quantity. If we consume too much fat, all the excess fat will be stored in our body and could, in the long run, lead to obesity and other dangerous heart diseases.

Answer: Option D. -> Egg
:
D

Chicken, egg, cottage cheese etc. are all rich sources of protein. These items provide strength to the body. Apples are rich in fibre. Cabbage is rich in vitamins.

Answer: Option B. -> False
:
B

Fats provide us with energy but it is good only if consumed in proper quantity. If we consume too much fat, all the excess fat will be stored in our body and could, in the long run, lead to obesity and other dangerous heart diseases.

Answer: Option A. -> diabetes
:
A

Diabetes is a lifestyle disease. This means that the disease can often occur as a result of a person's eating habits. Therefore, excessive consumption of junk food can result in obesity which in turn could increase the risk of diabetes.