To explain the energy changes in the biomass of organisms at successive stages in the food

chain.

To describe how the efficiency of food production can be improved.

Advantages Animals not restricted in terms of movement.

Less stress.

Less susceptibility to disease.

Consumers report better tasting meat.

Lower running costs.

High productivity.

More profitable.

Less labour-intensive.

Climate not an issue.

Disadvantages More labour-intensive.

Expense of feeding.

Animals more susceptible to climatic factors.

Reputation amongst public/environmental bodies.

Animals susceptible to rapid spread of disease.

Costs of maintaining conditions inside buildings.

Free range Factory farming