August 2015

Experiment: Do plants release carbon dioxide when they respire?

By |2022-09-15T12:41:43+02:00August 27th, 2015|Notes, O Level Science Notes, Ordinary Level Notes|

Potted plant. Image credit artificialplantsandtrees.com

Potted plant. Image credit artificialplantsandtrees.com ZIMSEC Combined Science Revision Notes: Do plants release carbon dioxide when they respire?

Aim: To determine whether all living things, including plants, release carbon dioxide when they respire.

Materials: bell jar or a large container, 3 boiling tubes/flasks glass or rubber tubing, lungs, suction […]


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Inhaled vs Exhaled air experiment: Method 2

By |2022-09-15T12:41:44+02:00August 25th, 2015|Notes, O Level Science Notes, Ordinary Level Notes|

Lime water is used to test for carbon dioxide. Image  weebly.com

Lime water is used to test for carbon dioxide. Image weebly.com ZIMSEC O Level Combined Science Notes: Inhaled vs Exhaled air experiment: Method 1

Aim: Test to compare the composition of exhaled and inhaled air.

Materials: Limewater (to test for the presence […]


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Exhaled air vs inhaled air

By |2022-09-15T12:41:44+02:00August 25th, 2015|Notes, O Level Science Notes, Ordinary Level Notes|

Air sacs. Image credit MediaWiki

Air sacs. Image credit MediaWiki ZIMSEC O Level Combined Science Notes:Exhaled air vs inhaled air
  • Air which enters the lungs (inhaled air) is different in several regards to air that is passed out (exhaled air)
  • Exhaled air contains less oxygen and more carbon dioxide.
  • It is also warmer […]

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Respiration

By |2022-09-15T12:41:45+02:00August 23rd, 2015|Notes, O Level Science Notes, Ordinary Level Notes|

ZIMSEC O Level Combined Science Notes: Respiration

  • During the gaseous exchange process oxygen is taken into the body and carbon dioxide is expended.
  • Oxygen is needed to burn fuels to release energy.
  • Food is a fuel and oxygen is used by th cells to “burn” the fuel.
  • The burning process is very slow and there are not flames involved.
  • […]


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The respiratory system and gaseous exchange

By |2022-09-15T12:41:46+02:00August 23rd, 2015|Notes, O Level Science Notes, Ordinary Level Notes|

Human respiratory system. Image credit anatrik.org

Human respiratory system. Image credit anatrik.org ZIMSEC O Level Combined Science Notes: The respiratory system and gaseous exchange
  • The respiratory system is responsible for gaseous exchange and breathing so that oxygen is taken into the body and carbon dioxide is released from the body.
  • Mammals including […]

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