August 2015

Products of digestion and the Absorption and Assimilation processes

By |2022-09-15T12:41:45+02:00August 24th, 2015|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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Poultry and Rabbit feeds

By |2022-09-15T12:41:46+02:00August 22nd, 2015|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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The enzyme amylase

By |2022-09-15T12:41:47+02:00August 22nd, 2015|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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The digestion process

By |2022-09-15T12:41:49+02:00August 19th, 2015|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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Growth and Development in Animals

By |2022-09-15T12:41:49+02:00August 19th, 2015|Notes, O Level Science Notes, Ordinary Level Notes|

A day old chick. Image credit 21food.com

A day old chick. Image credit 21food.com ZIMSEC O Level Combined Science Notes: Growth and Development in Animals.
  • Animals use some of the energy from the food they eat to grow.
  • During the growth process an animal changes and matures into an adult.
  • This process is […]

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Digestive systems of cows and rabbits

By |2022-09-15T12:41:50+02:00August 19th, 2015|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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Alimentary Systems

By |2022-09-15T12:41:50+02:00August 16th, 2015|Notes, O Level Science Notes, Ordinary Level Notes|

The human digestive system. Image credit airurbano.com

The human digestive system. Image credit airurbano.com ZIMSEC O Level Combined Science Notes: Alimentary Systems
  • Unlike plants, animals are just consumers and cannot make their own food.
  • They rely on plans as producers.
  • Most of the food eaten is made up of large insoluble molecules which […]

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