1. What are nutrients? 2. Which are the nutrients essential for our body? 3. Write the functions of food. 4. Name the different food groups. 5. How will you test for starch in a food sample? 6. How will you test for protein in a food sample? 7. How will you test for fat in a food sample? 8. What are the main carbohydrates found in our food? 9. Name two nutrients which protect the body from diseases. 10. Make a table about different vitamins, their sources and the role they play in our body functions.
Answers
Answer:
The major nutrients in our food are carbohydrates, proteins, fats, vitamins and minerals. In addition, food also contains dietary fibres and water. Carbohydrates and fats mainly provide energy to our body. Proteins and minerals are needed for the growth and the maintenance of our body.
ANSWER:-
1) A substance that provides nourishment essential for the maintenance of life and for growth.
2) Nutrients are compounds in foods essential to life and health, providing us with energy, the building blocks for repair and growth and substances necessary to regulate chemical processes. There are six major nutrients: Carbohydrates (CHO), Lipids (fats), Proteins, Vitamins, Minerals, Water.
3)Food provides our bodies with what they need to:
stay alive, be active, move and work;
build new cells and tissues for growth;
stay healthy and heal themselves;
prevent and fight infections.
4)breads, cereals, rice, pasta, noodles and other grains.
vegetables and legumes.
fruit.
milk, yoghurt, cheese and/or alternatives.
lean meat, fish, poultry, eggs, nuts and legumes.
5)Place one spatula of the food sample on a dish or 1 cm 3 if the sample is liquid. Using a dropper, place a few drops of iodine solution onto the food. Record any change in the colour of the solution.
6)Proteins are detected using Biuret reagent . This turns a mauve or purple colour when mixed with protein.
7)For fats the test is simply to squash a sample of food onto a piece of paper and leave it to dry. A positive test for fat is a translucent stain around the food sample when you hold the paper up to the light. of distilled water and stir
8)The two main forms of carbohydrates are sugars (such as fructose, glucose, and lactose) and starches, which are found in foods such as starchy vegetables, grains, rice, breads, and cereals. The body breaks down (or converts) most carbohydrates into the sugar glucose, which is absorbed into the bloodstream.
9)Antioxidants — such as vitamins C and E and carotenoids, which include beta-carotene, lycopene and lutein — help protect healthy cells from damage caused by free radicals.