The Table shows the energy at each trophic level of a food chain in a field.

Table

Trophic level	Organism	Energy in $kJ\text{kJ}$ per $m2\text{m}^2$ per year
producer	grass	$00020\,000$
primary consumer	rabbit	1600
secondary consumer	fox	96

Calculate the efficiency of energy transfer from the grass to the rabbits.

The rabbits use 1120 kJ per $m2\text{m}^2$ per year in respiration.

Calculate the percentage of the energy in the rabbits that is used in respiration.

Explain why only a small percentage of the energy in the grass is transferred to the rabbits.

Use information from the Table to explain why there are fewer foxes than rabbits in the field.

The Table shows the energy at each trophic level of a food chain in a field.

Table

Trophic level	Organism	Energy in $kJ\text{kJ}$ per $m2\text{m}^2$ per year
producer	grass	$00020\,000$
primary consumer	rabbit	1600
secondary consumer	fox	96

Calculate the efficiency of energy transfer from the grass to the rabbits.

The rabbits use 1120 kJ per $m2\text{m}^2$ per year in respiration.

Calculate the percentage of the energy in the rabbits that is used in respiration.

Explain why only a small percentage of the energy in the grass is transferred to the rabbits.

Use information from the Table to explain why there are fewer foxes than rabbits in the field.

9.2 Energy transfer and biodiversity

9.2 Energy transfer and biodiversity Questions