Energy Transfer in an ecosystem

What is wrong with this pyramid of numbers?

• Hawks don't eat Thrushes

• The clover should be at the bottom

• Snails don't eat clover

What can we conclude from this pyramid of numbers?

• The producer must be large

• The producer must be very small

• Primary consumer must be a carnivore

What is a trophic level?

• The position of an organism in a food chain, food web or pyramid

• The amount of food consumed by an organism in a food chain, food web or pyramid

• The size of a bar drawn in a pyramid of numbers or biomass

About what percentage of energy is transferred from one trophic level to the next?

• 10%

• 50%

• 90%

Which of the following is a reason why not all the energy at one trophic level is passed to the next level?

• Animals can eat and digest all of a plant or animal

• The pyramid of biomass gets smaller

• Energy is used movement

In a certain food chain, 45 kJ of energy is passed to the secondary consumers and 305 kJ is lost by the primary consumers. What percentage is transferred to the secondary consumers?

• 12.9%

• 14.8%

• 173%

Which of the following would help farmers increase the efficiency of food production?

• Feeding their animals more food

• Keeping their animals warm

• Giving their animals space to roam around

A food web including five species is shown below. Which of the following is most likely to cause the greatest decrease in the species B population?

• An increase in species E

• A decrease in species C

• A decrease in species D

• A decrease in species A

Which of the following is a difference between food chains and food webs?

• Food chains show energy flow in an ecosystem, and food webs do not.

• Food webs contain both plants and animals, but food chains contain only plants.

• Food chains are linear, while food webs are complex.

• Food webs separate organisms by trophic level, but food chains do not.