Towards a Healthy Life - 2

Proteins help in the formation of hair and nails in humans.

Vitamin A is important for good vision.

This is the correct option as this is not an intrinsic or internal factor which affects human health. Environmental pollution is an extrinsic factor.

Junk food is not good for health.

Amla, orange and lemon are citrus fruits. They are a rich source of vitamin C. 

Vitamins are major components of our food. They strengthen our body to fight against diseases.

Potatoes contain starch and thus give positive test for starch with iodine solution.

Calcium is a major component of our bones and teeth. Iron is present as haemoglobin in blood and iodine is required for the regular body metabolism. Mercury is poisonous for our health and can lead to death even if taken in small amount. 

Our teeth and bones are basically formed from the compounds of calcium, the deficiency of which leads to their decay.

Deficiency of proteins in the diet for a long time results in swelling of face and neck, undergrowth of the body, etc. This is because proteins are the building blocks of the body and should be taken in sufficient amounts. 

This is the correct option. Temporary or permanent damage to body parts causes physical diseases. Invasion of the body by other organisms causes infectious diseases. Inadequate diet causes deficiency diseases.

Mosquitoes should not be allowed to breed in stagnant water.
One should sleep under mosquito nets to prevent oneself from mosquito bites.

Water that is fit for drinking is called potable water.

Typhoid is a water-borne disease.

During diarrhoea, there is an excessive loss of water from the body along with salts and sugar. For this, WHO recommends a home-made solution of water with dissolved salt and sugar known as oral rehydration solution (ORS).