7.4 Trophic levels in an ecosystem (biology only)

EasyMediumHard
12345678910111213141516171819
Question 1
Medium

Farmers can increase the growth rate of livestock by controlling their diets.

A poultry farmer has 1500 ducks.

  • The farmer feeds the ducks on grain from barley plants.
  • 1 hectare of land produces 13.2 tonnes of barley grain.
  • The barley grain has an energy content of 15 MJ per kg.
  • Ducks can use 85% of the energy in barley grain.
  • Each duck needs 65 MJ of energy to grow to full size.

Calculate the area of land needed to provide enough energy from barley grain for 1500 ducks to grow to full size.

Give your answer in m2\text{m}^2m2.

Give your answer to 3 significant figures.

1 hectare = 10,000 m2\text{m}^2m2

1 tonne = 1000 kg

[5]

7.4 Trophic levels in an ecosystem (biology only) Questions

  1. GCSE
  2. /Biology
  3. /7.4 Trophic levels in an ecosystem (biology only)