Exam 10: Systems and Cycles: Are We Changing Earths Life Support System

Scientists are modeling the population of common loons (Gavia immer) over time on an isolated lake in Canada. What would be a flow in this example?

The increase in atmospheric levels of is leading to a in the pH of oceans.

Which of the following would be a sink for phosphorus?

Fossil fuels are a sink for carbon located in the

Oxygen, nitrogen and phosphorus are macronutrients, which means that they

A complex system like the climate of Earth can be better understood by

Methanogens are important for the cycling of which macronutrient?

An area described as a dead zone in the ocean is an area with

An ecosystem at a park near you is an example of a(n)

Is the human body an open or closed system? Justify your answer with examples.

How could Biosphere 2 have been modified to turn it into an open system?

Tracing the path of nitrogen as it travels through living things and nonliving things would be considered

As plants die, the nitrogen in their cells is converted to by fungi and bacterial decomposers, in a process known as .

There are several types of feedback described in Chapter 10. All of these have which feature in common?

If you removed a pea or bean plant from the soil and cut a small slice from a root nodule, what types of cells, other than plant cells, would you expect to find?

The Biosphere 2 project did not go as planned, and oxygen gas had to be supplemented into the system. This was due to

What is the main way in which excess phosphorus and nitrogen get into bodies of water to result in eutrophication?

Nitrogen is converted from its free form to ammonia by which of the following?

Scientists have isolated several bacteria from the soil. When they provide nitrogen compounds to these bacteria, they can detect higher amounts of N₂ gas being produced and released. Therefore, these researchers conclude these bacteria are capable of what process?

Diazotrophs are essential to plants because they