OXYGEN a) Occurrence. Fifty 50% of the earth’s crust consist of Oxygen combined with other elements e.g. oxides of metals About 70% of the earth is water made up of Hydrogen and Oxygen. About 20% by volume of the atmospheric gases is Oxygen that form the active part of air. b) School laboratory preparation […]
SEED GERMINATION CONDITIONS, CONDITIONS NECESSARY FOR GERMINATION What are the conditions necessary for seed germination? Seeds can easily be destroyed by unfavourable conditions such as excessive heat, cold or animals. Seeds need certain conditions to germinate and grow. Some of these conditions are external, for example water, oxygen and suitable temperature while others are internal
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OXYGEN (O2) PROPERTIES AND USES Oxygen (O2) is an active, life-sustaining component of the atmosphere; making up 20% by volume of the air we breathe. It is colorless, odorless and tasteless. Oxygen is the most widely occurring element on earth. Because it forms compounds with virtually all chemical elements except the noble gases, most oxygen
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