O Level Biology Weekly Quiz
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January 2023
Safety in the laboratory
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, […]
Biology Notes: Emergency Procedures in the Lab
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 […]
Biology Notes: Causes of accidents in the laboratory
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 […]
Biology related careers
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 […]
Chemical building blocks of Life: Water
Water is life
ZIMSEC O Level Biology Notes:Chemical building blocks of Life: Bio-molecules
Water
Structure of a water molecule
- Water is essential for life.
- Approximately 75% earth’s surface is water.
- Life evolved in water.
- An average adult body is 50 to 65 percent water
- This rises to about 80% in a child
- A water molecule is made up of 2 hydrogen atoms […]
Biology Notes: Water and its properties: Polar solvent
ZIMSEC O Level Biology Notes:Properties and Biological significance of water
Property: Polar solvent
- Water is an excellent solvent for ions and polar molecules because the water molecules attract to them, collect and separate them.
- This is what happens when a substance dissolves in water.
- Once a chemical is in solution, it is free to move about and react with other chemicals.
[…]
Biology Notes: Water and its properties: Transparency and high heat of evapouration
ZIMSEC O Level Biology Notes: Properties and Biological significance of water
Property: High heat of vaporization
- This is a measure of the heat energy required to vaporize a liquid to overcome the attractive forces between its molecules so that they can escape as a gas.
- A relatively large amount of energy is needed to vaporize water.
- This is due […]
Biology Notes: Water and its properties: Transport medium and specific heat capacity
ZIMSEC O Level Biology Notes:Properties and Biological significance of water
Property: Transport medium
- Water is a neutral liquid medium because it has a pH of 7.
Biological role of this property
- Water’s solvent properties also mean that it acts as a transport medium in the blood transporting cells, lymphatic and excretory system, the alimentary canal and in the xylem and phloem.
Property: High […]
Biology Notes: Water and its properties: Density and heat fusion
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 […]