KEGS Biology Blog


Wednesday 19th September
September 23, 2012, 12:24 pm
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Biochemistry

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In this lesson we looked at the main characteristics of the five kingdoms of biological taxonomy, such as cell type, composition of cell wall, means of nutrition and whether or not the organisms were uni or multicellulor. We also covered the definitions of an autotroph, heterotroph and saprotroph.
Autotroph: An organism able to fix their own source of carbon, i.e make their own food, for example plants via the process of photosynthesis.
Heterotroph: An organism that must eat an organism with a ready fixed source of Carbon in order to digest and subsequently reuse the carbon, for example animals that feed on plants, or other animals that have fed on plants.
Saprotroph: An organism that conducts digestion externally by releasing enzymes before absorbing the Carbon back into the body, for example fungi.

We also studied the process of classification used by biologists to determine different types of plant with a flow diagram that identifies certain aspects that the plants do not have in common, for example certain leaf shapes or colours, whether or not the plant has thorns, whether or not the plant has an almost regular structure or not, etc. By constructing our own flow diagram, we were able to determine the identity of six small samples labelled A-F as Holly, Hawthorn, Oak, Acacia, Alder, and Silver Birch.

Comment by benpessell




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