Energy transfer and pyramids

Question 1

A level of a food chain contains 10000 kJ. The next level gets 1500 kJ. What is the percentage efficiency of the energy transfer?

Answer %

Question 2

Producers in a field capture 50000 kJ of energy. About 10% of the energy passes to each next level. How much energy reaches the secondary consumers, in kJ?

Answer kJ

Question 3

A pyramid of biomass shows…

• A. the mass of living material at each level
• B. the number of species in the world
• C. the height of the animals
• D. the temperature at each level

Question 4

A level of a food chain contains 2000 kJ. The next level gets 200 kJ. What is the percentage efficiency of the energy transfer?

Answer %

Question 5

Producers in a field capture 10000 kJ of energy. About 10% of the energy passes to each next level. How much energy reaches the secondary consumers, in kJ?

Answer kJ

Question 6

Why do food chains rarely have more than four or five levels?

• A. There are not enough names for them
• B. There is too little energy left to support more levels
• C. Top predators do not need energy
• D. Plants stop growing

Question 7

A level of a food chain contains 4000 kJ. The next level gets 800 kJ. What is the percentage efficiency of the energy transfer?

Answer %

Question 8

Producers in a field capture 10000 kJ of energy. About 10% of the energy passes to each next level. How much energy reaches the tertiary consumers, in kJ?

Answer kJ

Question 9

Why is only about 10% of energy passed to the next level of a food chain?

• A. Plants keep all the energy
• B. Animals refuse to eat most of their food
• C. Energy is destroyed at each level
• D. Much is used for respiration and movement, or lost as heat and waste

Question 10

A level of a food chain contains 10000 kJ. The next level gets 1500 kJ. What is the percentage efficiency of the energy transfer?

Answer %

Question 11

Producers in a field capture 100000 kJ of energy. About 10% of the energy passes to each next level. How much energy reaches the secondary consumers, in kJ?

Answer kJ

Question 12

Why is it more energy-efficient for people to eat plants than to eat animals fed on plants?

• A. Energy is lost at each extra level of the food chain
• B. Animals contain no energy
• C. Plants have more protein than meat
• D. Meat is always unhealthy

Question 13

A level of a food chain contains 8000 kJ. The next level gets 400 kJ. What is the percentage efficiency of the energy transfer?

Answer %

Question 14

Producers in a field capture 20000 kJ of energy. About 10% of the energy passes to each next level. How much energy reaches the tertiary consumers, in kJ?

Answer kJ

Question 15

Why do food chains rarely have more than four or five levels?

• A. Top predators do not need energy
• B. There are not enough names for them
• C. Plants stop growing
• D. There is too little energy left to support more levels

Question 16

A level of a food chain contains 5000 kJ. The next level gets 500 kJ. What is the percentage efficiency of the energy transfer?

Answer %