Exam 18: Ecosystems

A tallgrass prairie or beech-maple woodland are examples of

In marine ecosystems, net primary productivity tends to be

If a person needs to consume 100 kcal of energy and she chooses to do that by eating chicken, how many kcal of grain would the chicken need to consume to make 100 kcal available to the human?

You are relaxing on an island beach enjoying the warm air and sunshine when you notice the striking pure blue color of the water in the deep crater of the island's bay. The water in the surrounding ocean is more of a green color. Which of the following is a logical hypothesis?

Tuna are predatory fish that consume smaller, carnivorous fish that have fed on zooplankton. The zooplankton had fed on phytoplankton. You eat tuna, you are what level of the food chain?

Match each term to its correct description below. -Nearly one third of the Earth's land surface is covered with this biome that does not retain heat because it lacks moisture. The plants have small leaves, like the spines on cacti, to minimize water loss. Most of the animals are nocturnal.

Which of the following groups of organisms would NOT be considered to be consumers?

On what four factors does net primary productivity rely, and what terrestrial ecosystem is the most productive because of these factors?

You are studying a grassland ecosystem with 400,000 kcal of energy stored in the primary producer level. Grasshoppers eat the grass, meadowlarks eat the grasshoppers, and a hawk eats the meadowlarks. How many kcals are now stored, and available, in the hawk?

All of the living organisms present in an ecosystem comprise the ________ or biotic portion of the ecosystem.

The amount of energy captured by photosynthetic organisms, minus the amount lost as heat from respiration and other life processes, is called ________.

In the absence of ________, nutrients would not move from the abiotic to the biotic portion of the nutrient cycle within an ecosystem.

What best explains this observation: consumers directly use approximately 20 percent of a forest's net primary productivity (NPP), whereas decomposers directly use approximately 80 percent?

Ecologists often define an ecosystem by describing how ________ and ________ are acquired and distributed by the biotic community.

Which of the following describes the ultimate disposition of most energy in an ecosystem?

In the diagram below, how do nutrient and energy flow differ?

Which of the following are likely biotic components of a desert ecosystem?

A group of living communities interacting with one another and their shared physical environment is a(n) ________.

A community of organisms together with the physical environment in which they live is known as a(n)

What would happen to nutrient cycling in a forest ecosystem if all of the bacteria, protozoans, fungi, and worms were eliminated?