health

A balanced diet. Image credit healthandstylish.com ZIMSEC O Level Combined Science Notes: Nutrition

• Nutrition is that branch of science that deals with nutrients and nutrition especially in humans
• It is concerned with  ensuring that humans are eating foods that provide necessary nutrients for health and growth
• Nutrients […]
  

Testing for starch. Image credit fineartamerica.com ZIMSEC O Level Combined Science Notes: Carrying out Food Tests

• It is important to know how much nutrients they contain
• This would be useful to nutritionist and those who are health conscious

Food Testing experiments

• Simple tests can be made […]
  

Iodised salt can prevent iodine deficiency ZIMSEC O Level Combined Science Notes: Deficiency Diseases

• A person might suffer from a deficiency disease if their diet lacks certain essential minerals and vitamins
• Two essential minerals and vitamins are:
• Iodine and
• Vitamins

Iodine

Construction workers require a lot of energy. Image credit nehandaradio.com ZIMSEC O Level Combined Science Notes: Experiment: People and Energy

• While it is true that everyone needs energy for metabolism and daily activities
• Different people have different food needs
• Food requirements can […]
  

Colgate toothpaste ZIMSEC O Level Combined Science Notes: Experiment: Testing tooth cleaning agent

Aim: To test the properties of teeth cleaning agents

Materials: various brands of toothpaste, pH paper, microscopes, slat, bicarbonate of soda, lid bottles/suitable containers for the toothpaste

Method

1. Examine toothpaste under a microscope to compare the particle size of the various […]