O Level Biology Notes Archives - Page 2 of 2 - Free ZIMSEC & Cambridge Revision Notes & Past Exam Papers

Biology Notes: Water and its properties: Surface tension
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Biology Notes: Water and its properties: Surface tension

Notes, O Level Biology Notes, Ordinary Level Notes

Biology Notes: Water and its properties: Surface tension

By Rachel Majaya|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
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Biology Notes: Water and its properties: Density and heat fusion

Notes, O Level Biology Notes, Ordinary Level Notes

Biology Notes: Water and its properties: Density and heat fusion

By Rachel Majaya|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 Rachel Majaya|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 Rachel Majaya|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 Rachel Majaya|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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