Biogeochemical Cycles & Populations

Front

How are the molecules shown in the model used in the process of photosynthesis? Options: Carbon dioxide is taken in by the plant and oxygen is released. Water and oxygen are used to produce glucose and carbon dioxide. Oxygen and carbon dioxide are used to produce glucose and water. Glucose is taken in by the plant and water is released.

Back

Carbon dioxide is taken in by the plant and oxygen is released.

Front

How does a thick algae bloom on the surface of water affect the amount of oxygen in the water?

Back

It decreases the amount of oxygen because plants are unable to perform photosynthesis.

Front

In the carbon cycle, why must all animals consume other organisms?

Back

They cannot absorb carbon directly from the air.

Front

How is phosphorus transferred between animals and soil?

Back

Decomposers break it down from wastes and dead animals.

Front

What is a density independent limiting factor?

Back

Hurricane

Front

Which of the following would INCREASE the carrying capacity of an ecosystem? Options: increase in predators, disease, increase in available food, drought

Back

increase in available food

Front

What do we call the variety of life in an ecosystem?

Back

Biodiversity

Front

The data in the graph most strongly support which explanation about the predator-prey relationship of the model? Options: An increasing predator population acts to increase the prey population. An increasing prey population acts to decrease the predator population. A decreasing prey population acts to limit the size of the predator population. Changes in predator and prey populations act independently, without acting on one another.

Back

A decreasing prey population acts to limit the size of the predator population.

Front

Based on the trends of the carrying capacity graph, what is the predicted (estimated) population of organisms, in millions, in 1950? Options: 2.0 million, 1.75 million, 1.25 million, 1.5 million

Back

1.75 million

Front

Density independent factor affects the growth of a population regardless of the population density. Which of the following is an example of a density independent factor?

• a tornado destroying a stand of pine trees
• two species competing for the same food source
• snowy owls preying on arctic hares
• a disease passing through a population of pigs on a farm
• intraspecific competition

Back

a tornado destroying a stand of pine trees