Ecology in Review

Even though both hawks and owls have two sources of food, explain why hawks would be less likely to survive if a disease wiped out the mice.

• The hawks eat mice and snakes, which also eat mice; while the owls eat mice and frogs, which eat crickets not mice. The hawk’s and owl’s second food source feed on mice

• The hawk’s and owl’s second food source feed on mice

• Disease would wipe out all the organisms in the ecosystem.

• Disease would wipe out all the organisms in the ecosystem. The grasses population growth would exceed its carrying capacity and the cricket population would increase.

The population of wolves in 1979 was close to

• 20

• 800

• 50

• 2500

An observable trend in the wolf and moose data between 1979 and 2009

• as the wolf population decreases, the moose population increases

• as the wolf population decreases, the moose population decreases

• the numbers of wolves and moose don’t appear to be related

• the numbers of wolves and moose are relatively constant

In ecology, organisms

• interact with each other, but do not interact with the physical environment

• are independent and do not interact with each other or with the physical environment

• do not interact with other living organisms, but do interact with the physical environment

• interact with other living organisms and interact with the physical environment

In this pond where these fish live, temperature is a

• limiting factor

• hereditary factor

• source of ATP

• source of solar energy

• 12°C to 18°C

• 32°C to 38°C

• 2°C to 8°C

• 22°C to 28°

In a lake environment where the fish live, temperature is both a

• limiting factor and biotic

• source of energy and biotic factor

• source of nutrition and abiotic factor

• limiting factor and abiotic factor

Number 2 in the pyramid represents

• producers

• herbivores

• scavengers

• decomposers

Using the graph, iIf the oak and hickory trees were burned in a forest fire, leaving bare soil, which group of plants would most likely be the first to grow back?dentify what is going o

• crabgrass and horseweed

• oak and hickory trees

• broomsedge and pine seedlings

• mature pine and young deciduous trees

Nitrogen is a primary necessity for all organisms to survive. It is found most abundant in the Earth's atmosphere in the form of a gas. However, nitrogen must be converted into another form in order for organisms to use it. Which crucial component sits in the center of the nitrogen cycle, and why is it important?

• Sun: it provides the initial energy to the plants so they can release the nitrogen into the cycle

• Producers: they produce the nitrogen that is circulating.

• Decomposers: they break down dead plants and animals to reintroduce nutrients into the cycle.

• Secondary consumers: they remove nitrogen from the atmosphere