Energy in biomass

Question 1

In this food web, what is represented by the arrows?

Answer 1

The arrows in a food chain represent energy transfer.

Question 2

Which of these organisms is a producer?

Answer 2

Animals are consumers; so pondweed is the only producer in this list.

Question 3

What is the longest food chain in this food web?

Answer 3

The longest food chain here is four trophic levels.

Question 4

For this particular food web a pyramid of biomass would be widest

Answer 4

The pyramid of biomass will be widest at the bottom.

Question 5

In a certain food chain, 20% of the energy from the first trophic level to the second one, so:

Answer 5

The efficiency refers to the useful transfer of energy in the food chain, not to the surroundings, so the answer here is 20%.

Question 6

Answer 6

Remember - plants and algae are always at the start of

any food chain because they get their energy directly fromthe sun.