Energy transfer and pyramids

Question 1

A level of a food chain contains 5000 kJ. The next level gets 600 kJ. What is the percentage efficiency of the energy transfer?

Answer %

Question 2

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

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

Question 3

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

Answer kJ

Question 4

A level of a food chain contains 5000 kJ. The next level gets 750 kJ. What is the percentage efficiency of the energy transfer?

Answer %

Question 5

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 6

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

Answer kJ

Question 7

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 8

A pyramid of biomass shows…

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

Question 9

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 10

A level of a food chain contains 4000 kJ. The next level gets 200 kJ. What is the percentage efficiency of the energy transfer?

Answer %

Question 11

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

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

Question 12

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

Answer kJ

Question 13

A level of a food chain contains 2000 kJ. The next level gets 240 kJ. What is the percentage efficiency of the energy transfer?

Answer %

Question 14

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

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

Question 15

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 16

A level of a food chain contains 4000 kJ. The next level gets 600 kJ. What is the percentage efficiency of the energy transfer?

Answer %