Task 4c: Answer the exam questions and self mark

Task 6b: Make notes that:

• Define trophic level, apex predator and decomposer

• Draw a food chain involving 4 organisms

  1. Label the producer, primary consumer, secondary consumer and tertiary consumer

  2. Label each trophic level

• Define biomass and explain the difference between dry and wet biomass.

• Describe the differences between a pyramid of biomass and pyramid of numbers.

1. Use the data provided to draw a pyramid of biomass

2. Calculate the percentage change in biomass between:

i) The producer to the primary consumer

ii) The primary consumer to the secondary consumer

3. Suggest why biomass decreases at each trophic level.

Task 7b: Make notes that:

• Copy the key facts on slide 7

• List the ways in which biomass is lost along a food chain and explain why each one causes biomass to be lost.

1. Use the data provided to calculate the percentage of biomass lost at each trophic level.

2. Calculate the efficiency of the energy transfer at each trophic level

Task 7c: Answer the exam question and self mark

Task 8b: Make notes that:

• Define food security

• List the biological factors that are affecting food security.

• List the ways to improve the efficiency of food production.

• Evaluate the use of factory farming to increase the efficiency of food production (advantages and disadvantages and come to an overall conclusion)

Task 8c: Use data from the graph to explain how changin diets in one country can affect food security in another. (6 marks)

Task 8d: Answer the exam question and self mark.

Task 9b: Make notes that:

• Describe how we can reduce the length of food chains.

• Describe how we can reduce waste.

• Describe overfishing and list the ways in which we can manage fish stocks.

• Answer the questions on slide 13 and self mark using slide 14.

• State what mycoprotein is and give the conditions needed to produce it.

• List the ways genetic modification can be useful in making food production more sustainable.

Task 9d: Answer the exam question and self mark.