Question 26

Question

Directions: The diagram below models part of the nitrogen cycle. Use the diagram to answer any questions that follow.

What happens to the nitrogen at W?

a
Its usable form is inhaled and turned into proteins by the rabbit.
b
Its usable form is bonded with other molecules in the atmosphere.
c
Its unusable form is directly transferred up the tree roots.
d
Its unusable form is converted into a form that is usable by bacteria in the soil.
Question 27


Based on the pyramid, which organism(s) provide the MOST available energy?

a
predator fish
b
phytoplankton and bacteria
c
birds and mammals
d
insects and zooplankton
Question 28
What is the typical/average percentage of loss of energy in transfers from one trophic level to the next?

a
10%
b
50%
c
60%
d
90%
Question 29
Within the ecosystem there are producers, consumers, and decomposers. Which are found at the bottom of the energy pyramid?

a
producers
b
consumers
c
decomposers and producers
d
decomposers and consumers
Question 30
The pyramid shows how biomass changes between trophic levels of an ecosystem.

image b95050928618458399679f086eb24478



Which explains how the biomass at the top of the pyramid will change if a fire destroys a large percentage of the grasses in this ecosystem?

a
It will increase because the amount of energy lost as heat between the first trophic level and second trophic level will decrease.
b
It will decrease because there will be a greater number of organisms at the second trophic level to support the higher trophic levels.
c
It will decrease because the amount of chemical energy photosynthesis generates will not be enough to support higher trophic levels.
d
It will increase because the fire increases the efficiency of energy transfer and prey aquisition at higher trophic levels.

Answer 1

Here are the answers to your questions:

Question 26: What happens to the nitrogen at W?

• Answer: d Its unusable form is converted into a form that is usable by bacteria in the soil.

Question 27: Based on the pyramid, which organism(s) provide the MOST available energy?

• Answer: b phytoplankton and bacteria

Question 28: What is the typical/average percentage of loss of energy in transfers from one trophic level to the next?

• Answer: d 90%

Question 29: Within the ecosystem there are producers, consumers, and decomposers. Which are found at the bottom of the energy pyramid?

• Answer: a producers

Question 30: Which explains how the biomass at the top of the pyramid will change if a fire destroys a large percentage of the grasses in this ecosystem?

• Answer: c It will decrease because the amount of chemical energy photosynthesis generates will not be enough to support higher trophic levels.