O Level Biology Notes

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March 2017

Biology Notes: Water and its properties: Surface tension

By |2018-03-03T10:28:00+02:00March 30th, 2017|Notes, O Level Biology Notes, Ordinary Level Notes|

ZIMSEC O Level Biology Notes:Properties and Biological significance of water

Property: High surface tension and cohesion (adhesion and cohesion)

  • Cohesion is the force whereby individual molecules stick together.
  • Adhesion is the force whereby water molecules stick to other surfaces.

Biological role

  • Cohesion helps water to move as an unbroken column in the xylem tubes in plants.
  • Adhesion helps the water to stick […]
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Biology Notes: Water and its properties: Density and heat fusion

By |2018-03-03T10:22:45+02:00March 30th, 2017|Notes, O Level Biology Notes, Ordinary Level Notes|

ZIMSEC O Level Biology Notes:Properties and Biological significance of water

Property: High heat of fusion

  • This is a measure of the heat energy required to melt a solid (ice).
  • Liquid water must lose a large amount of heat energy to freeze.

Biological role

  • Contents of cells and their environment are therefore less likely to freeze.
  • This is an advantage for bodies of […]
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Biology Notes: Causes of accidents in the laboratory

By |2017-03-30T07:34:47+02:00March 30th, 2017|Notes, O Level Biology Notes, Ordinary Level Notes|

Nitric acid fumes. Image credit amazingrust.com

ZIMSEC O Level Biology Notes:Causes of accidents in the laboratory

  • Fire – There should never be open flames in the lab. Make it a working rule that water is the only nonflammable liquid you are likely to encounter.
  • Explosion – Never heat a closed system or […]
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Biology related careers

By |2017-03-30T07:26:00+02:00March 30th, 2017|Notes, O Level Biology Notes, Ordinary Level Notes|

There are many Biology Related Careers. Image credit corning.com

ZIMSEC O Level Biology Notes:Biology related careers

These fall into the biology of applied sciences such as Agriculture, Medical science, Breeding, Forestry and Horticulture, Fishery, Pest Control and Animal Husbandry. The list is not exhaustive.

  • Medical Doctor
  • Nurse
  • Dermatologist
  • Biological Technician
  • Medical and Health […]
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Principal Branches of Biology

By |2017-03-30T06:59:45+02:00March 30th, 2017|Notes, O Level Biology Notes, Ordinary Level Notes|

A fish pond teeming with biological specimen. Image credit bigrockponds.com

ZIMSEC O Level Biology Notes:Principal Branches of Biology

  • The division and different branches of science are constantly spreading with the increase of knowledge in science.
  • The two main branches of science are Physical science and Biological Science.
  • Physical Science is also called […]
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Biology Notes: Emergency Procedures in the Lab

By |2017-03-30T06:42:49+02:00March 30th, 2017|Notes, O Level Biology Notes, Ordinary Level Notes|

Use the available First Aid Kit whenever there is an injury. Image credit MediaWiki

ZIMSEC O Level Biology Notes:Emergency Procedures

  • Immediately alert your instructor in case of ANY accident or fire.

A: Fire

  • In the event that your hair or clothing catches fire — DO NOT RUN. This will fuel the fire. STOP […]
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Safety in the laboratory

By |2017-03-29T09:19:30+02:00March 29th, 2017|Notes, O Level Biology Notes, Ordinary Level Notes|

A typical Biology Laboratory. Image credit ad.edu

ZIMSEC O Level Biology Notes: Safety in the Laboratory

A: Eye Protection

 

  • Wear splash goggles all the time.

B: Clothing and Personal Items

  • Closed shoes must be worn during the entire time that you are in the laboratory to protect you from splashes of chemicals, broken glass, […]
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