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Fig. 6.1 shows the flow of energy through the trees in a forest ecosystem. The numbers represent inputs and outputs of energy in kilojoules per m² per year.

Fig. 6.1

1. 1. On Fig. 6.1, draw a ring around the number which indicates the energy entering the system via photosynthesis.

      [1]

   2. The total energy available to the plants in the ecosystem is 1 880 000 kJ per m² per year.

      Calculate the efficiency of photosynthesis. Show your working.

      Efficiency = ……………………………

      [2]

2. Suggest four reasons why so much solar energy is not used in production in the forest ecosystem.

   1………………………………………………………………………………………………

   2………………………………………………………………………………………………

   3………………………………………………………………………………………………

   4………………………………………………………………………………………………

   [4]

3. In what form will energy from plant respiration escape from the ecosystem?

   [1]