February 2025

Factors to consider when choosing construction materials

By |2025-02-12T09:23:47+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A house built using Eco friendly materials. Image credit asiagreenbuildings.com A house built using Eco friendly materials. Image credit asiagreenbuildings.com ZIMSEC O Level Combined Science Notes: Factors to consider when choosing construction materials

  • The choice of building material depends mainly on the properties of the materials and
  • The purpose of the […]
Read More
Comments Off on Factors to consider when choosing construction materials

Machines: Pulleys

By |2025-02-12T09:41:07+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Wooden pulleys. Image credit wisegeek.com Wooden pulleys. Image credit wisegeek.com ZIMSEC O Level Combined Science Notes: Machines: Pulleys

  • A pulley is a basic device or machine made of a wheel with a rim that a chain/cord/rope fits around
  • A single fixed pulley as shown below is used to change the direction […]
Read More
Comments Off on Machines: Pulleys

Experiment: Food and Energy

By |2025-02-12T09:14:50+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Burning food to to test its energy content Burning food to to test its energy content ZIMSEC O Level Combined Science Notes: Experiment: Food and Energy

Aim: Comparing the energy value of foods

Materials: burners, small containers/beakers to hold the water, food holders, thermometers, different types of starchy and fatty foods

Method

  1. Set up the apparatus […]
Read More
Comments Off on Experiment: Food and Energy

Reproduction in Humans

By |2025-02-12T09:31:34+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A Zimbabwean family A Zimbabwean family ZIMSEC O Level Combined Science Notes: Reproduction in Humans

  • Human being produce sexually
  • The process involves the fusion (joining) of the nuclei (sex cells) of the male gamete (sperm)
  • and the female gamete (ovum)
  • To form a zygote
  • The human and female sexual organs take […]
Read More
Comments Off on Reproduction in Humans

Products of digestion and the Absorption and Assimilation processes

By |2025-02-12T09:39:12+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Human nails, one of the products of assimilation. Image credit arithmaroo.com Human nails, one of the products of assimilation. Image credit arithmaroo.com ZIMSEC O Level Combined Science Notes:Products of digestion and the Absorption and Assimilation processes

  • After food has been digested in can now be used.
  • The end products ( which would […]
Read More
Comments Off on Products of digestion and the Absorption and Assimilation processes

Nutrition

By |2025-02-12T09:11:30+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

A balanced diet. Image credit healthandstylish.com 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 […]
Read More
Comments Off on Nutrition

Advantages and disadvantages of vegetative production

By |2025-02-12T09:36:14+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Sugarcane field. Image credit gov.ph Sugarcane field. Image credit gov.ph ZIMSEC O Level Combined Science Notes: Reproduction in plants: Advantages and disadvantages of vegetative (asexual) production  

  • A lot of plants which grow using the vegetative method of reproduction are able to produce seeds
  • They use vegetative reproduction because it has certain advantages

Advantages

  • New […]
Read More
Comments Off on Advantages and disadvantages of vegetative production

Selection

By |2025-02-12T08:59:43+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Selection

  • Each time male and female individuals reproduce they create an offspring that is different from themselves
  • This changes accrue over time to bring about much change in the descendants as there is inter-breeding between many individuals in each generation
  • This changes might result in the offspring having certain advantageous characteristics that are […]
Read More
Comments Off on Selection
Toggle Sliding Bar Area
Go to Top