Calculate energy transfer efficiency between trophic levels

Question 1

Why are food chains rarely longer than 4 or 5 levels?

• A. There are not enough species on Earth
• B. Animals refuse to eat higher animals
• C. Plants stop growing
• D. Too little energy is left to support another level

Question 2

Producers capture 500000 kJ. 10 % is passed to primary consumers and 5 % of that is passed to secondary consumers. How much energy reaches the secondary consumers, in kJ?

Answer kJ

Question 3

Producers in a field store 25000 kJ/m² of energy per year. Primary consumers gain 2500 kJ/m². What is the efficiency of energy transfer, in %?

Answer %

Question 4

Pyramids of biomass are usually pyramid-shaped. Why?

• A. It is just how they are drawn
• B. Producers are always heavier individually
• C. Less biomass can be supported at each higher level because energy is lost
• D. Predators are always smaller than prey

Question 5

Producers capture 200000 kJ. 10 % is passed to primary consumers and 5 % of that is passed to secondary consumers. How much energy reaches the secondary consumers, in kJ?

Answer kJ

Question 6

Producers in a field store 20000 kJ/m² of energy per year. Primary consumers gain 3000 kJ/m². What is the efficiency of energy transfer, in %?

Answer %

Question 7

Why are food chains rarely longer than 4 or 5 levels?

• A. Animals refuse to eat higher animals
• B. Too little energy is left to support another level
• C. Plants stop growing
• D. There are not enough species on Earth

Question 8

Producers capture 500000 kJ. 10 % is passed to primary consumers and 5 % of that is passed to secondary consumers. How much energy reaches the secondary consumers, in kJ?

Answer kJ

Question 9

Producers in a field store 20000 kJ/m² of energy per year. Primary consumers gain 1600 kJ/m². What is the efficiency of energy transfer, in %?

Answer %

Question 10

Why is energy transfer between trophic levels inefficient?

• A. Predators eat too much
• B. Energy is destroyed at each level
• C. Much is used in respiration and lost as heat, and some material is not eaten or digested
• D. Consumers photosynthesise

Question 11

Producers capture 200000 kJ. 20 % is passed to primary consumers and 10 % of that is passed to secondary consumers. How much energy reaches the secondary consumers, in kJ?

Answer kJ

Question 12

Producers in a field store 50000 kJ/m² of energy per year. Primary consumers gain 10000 kJ/m². What is the efficiency of energy transfer, in %?

Answer %

Question 13

Why is energy transfer between trophic levels inefficient?

• A. Energy is destroyed at each level
• B. Much is used in respiration and lost as heat, and some material is not eaten or digested
• C. Consumers photosynthesise
• D. Predators eat too much

Question 14

Producers capture 500000 kJ. 20 % is passed to primary consumers and 5 % of that is passed to secondary consumers. How much energy reaches the secondary consumers, in kJ?

Answer kJ

Question 15

Producers in a field store 10000 kJ/m² of energy per year. Primary consumers gain 1200 kJ/m². What is the efficiency of energy transfer, in %?

Answer %

Question 16

Why is energy transfer between trophic levels inefficient?

• A. Energy is destroyed at each level
• B. Much is used in respiration and lost as heat, and some material is not eaten or digested
• C. Consumers photosynthesise
• D. Predators eat too much