Carbon and Nitrogen

Nitrogen and Carbon Cycles, Levels of Organization Bellringe

Multiple Choice

Where does nitrogen originally come from?

• plants

• atmosphere

• animals

• water

Multiple Choice

Dead zones are low-oxygen areas that develop on the seafloor. Scientists hypothesize that phytoplankton blooms cause these dead zones. Phytoplankton blooms occur when excess nutrients are introduced by pollution from fertilizers, sewage plants, and the burning of fossil fuels. Which of the following would most likely cause an increase in these contributors to dead zones?

• Rainfall patterns that increase freshwater runoff from terrestrial ecosystems
• Replacing coal-fired power plants with windmills
• Farming practices that reduce nitrate and phosphate applications
• Constructing efficient water-recovery and treatment plants

Multiple Choice

The diagram shows the flow of organic molecules through an ecosystem. One process that occurs in this ecosystem is labeled X, and another process that occurs is labeled Y.
Which two processes are identified by the labels X and Y?

• X: Respiration
  Y: Predation
• X: Adaptation
  Y: Decomposition
• X: Fermentation
  Y: Nitrogen fixation
• X: Decomposition
  Y:Respiration

Multiple Choice

A science class is planning a field trip to a local farm that has a large pond. Which of the following lists the order of biological organization from smallest to largest that the students can expect to find at the pond?

• Organism, community, population, ecosystem

• Organism, population, community, ecosystem

• Population, organism, community, ecosystem

• Population, organism, ecosystem, community

Multiple Choice

A student is studying the ecology of a playa lake, which forms after a rainfall in a dry lake bed. The table lists the organisms that the student observed.
Which level of biological organization has the student described in the table?

• Biosphere
• Organelle
• Ecosystem
• Community