February 2025

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 […]
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Digestive systems of cows and rabbits

By |2025-02-12T09:17:31+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Cows. Image credit creativeblogs.net Cows. Image credit creativeblogs.net ZIMSEC O Level Combined Science Notes: Digestive systems of cows and rabbits

  • Cows and rabbits are examples of herbivores.
  • They feed on plants e.g. grass and leaves.
  • Pant structures contain a large amount of cellulose which cannot be digested easily.
  • Cellulose is a fibrous carbohydrate.
  • Much […]
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The digestion process

By |2025-02-12T09:20:39+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

digestive_system_-min The digestive system of a human being. Image credit MediaWiki ZIMSEC O Level Combined Science Notes: The digestion process

  • Food is broken down in the alimentary system from large pieces/molecules into smaller molecules.
  • The food most mammals ingest is in large pieces e.g. leaves, grass, cake, meat etc.
  • All […]
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The enzyme amylase

By |2025-02-12T09:29:26+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Starch food. Image credit eurofins.com Starch food. Image credit eurofins.com ZIMSEC O Level Combined Science Notes: The enzyme amylase

  • Energy in cells is obtained by breaking down food molecules during the respiration process.
  • The chemical reactions involved are carried out by enzymes.
  • Enzyme molecules also break down food molecules in the digestive system and […]
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Poultry and Rabbit feeds

By |2025-02-12T09:29:54+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Poultry and Rabbit feeds

Chickens

  • Food forms the major part of costs when rearing poultry for eggs and meat.
  • It is therefore vital that the poultry  feed is obtained, mixed and given to chickens in the most economic and cost saving way.
  • The range of feed and the composition of the diet depends on […]
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