Unit 6 Review

Match the following

• Organism

• 
• Community

• 
• Population

• 

The populations of which organisms will most likely increase as a result of a disease that suddenly reduced the population of Texas horned lizards?

• Grasses and ants

• Ants and grasshoppers

• Grasshoppers and Texas cottonmouths

• Texas cottonmouths and red-shouldered hawks

Tags

12C

A sudden disease causes the krill population to become severely reduced. Which organism in the food web below is most affected by this situation?

Tags

12C

Which organism is a primary consumer that eats dandelions?

Tags

12C

Which statement provides the best explanation for the difference in biomass of organisms found at each trophic level?

• Organisms at higher trophic levels have less energy available to them than organisms at lower trophic levels.

• Organisms at higher trophic levels require smaller habitats than organisms at lower trophic levels.

• Organisms at lower trophic levels provide less energy than organisms at higher trophic levels

• Organisms at lower trophic levels outcompete organisms at higher trophic levels.

Tags

12C

All of the organisms in a typical ecosystem are interdependent, helping to maintain the equilibrium of the ecosystem and sustaining each other. Which of the following processes can bacteria perform that is not possible for the other members of a typical ecosystem?

• Converting radiant energy into chemical energy

• Conserving water

• Using nitrogen from the atmosphere

• Balancing carbon dioxide levels

Tags

11A

Thick fleshy stems with thick waxy covering would most likely be useful adaptations for which of the following types of plants?

• Desert plants that need to conserve water

• Prairie plants that need to survive fires

• Tundra plants that need to conserve heat

• Rainforest plants that need to repel insects

Tags

12B

In recent years humans have interfered with the natural balance within deer populations in various ecosystems. The interference includes eliminating predators of the deer. Which of the following statements correctly describes the long-term outcome of this interference?

• The deer that are the fastest and most agile will survive and reproduce.

• The deer population will be too large to be supported by producers.

• Other browsing species will thrive and outcompete the deer.

• The producers will evolve into species that are less palatable to the deer.

Tags

12E

Reorder the following stages of succession.

• 
• 
• 
• 

Tags

11B

The main difference between primary and secondary succession is that primary succession begins in an area of no

Tags

11B