Topic 1- Characteristics of living organisms

These cards are based on information from the IGCSE Biology Study Guide released by CIE

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MRS GREN

Movement

Reproduction

Sensitivity

Growth

Respiration

Excretion

Nutrition

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Movement

In respones to changes e.g. the presence of a predator, to find food or mate. Parts of plants move very slowly e.g. to obtain more light for photosynthesis (achieved by growth)

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Reproduction

Producing offspring. This prevents extinction of the species

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Sensitivity

The ability to sense and respond to changes in the surroundings. The term 'irritability' is sometimes used instead.

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Growth

An increase in size, mass and complexity of an organism.

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Respiration

The breakdown of food in cells to release energy.

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Excretion

Getting rid of waste products made by chemical reactions in cells.

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Nutrition

This involved feeding by obtaining nutrients for growth, energy and maintaining health. Plants make thier own food using photosynthesis, by obtaining simple nutrients (water and carbon dioxide) and light energy.

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Things to remember

1. Do not confuse respiration with breathing.
2. Do not use faeces or defecation as an example of excretion (faeces is undigested food and it has not been formed through the metabolic processes).

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