Benchmark 6 - Ecology

Front

What type of relationship do cactus wrens and cholla cacti demonstrate? Options: Mutualism, Competitive, Commensalism, Parasitism

Back

Commensalism

Front

The mouse population of an area decreased last year. Which abiotic factor would explain the population decrease?

Back

a decrease in rainfall

Front

Which animal is classified as an omnivore? Options: black bear, deer, red fox, rabbit

Back

black bear

Front

Common animal diets: Snakes: Squirrels, chipmunks, gophers, and mice; Hawks and Owls: Rodents and reptiles; Rodents: Seed, nuts, roots, grass, leaves, and flowers. Which energy pyramid best represents the data in the table?

Back

A

Front

Which relationship is mutualistic? Options: An insect that lives and feeds on the body of an alligator, A bird that migrates to follow the movements of the butterflies that it eats, A deer that eats one kind of plant, which allows another kind of plant to grow in its place, An ant that lives on a plant and eats the nectar and defends the plant from other insects

Back

An ant that lives on a plant and eats the nectar and defends the plant from other insects

Front

What could account for the change in the pigeon population between years 7 and 8? Options: The birth rate of the pigeons increased, The neighborhood reached its carrying capacity for the pigeon population, The emigration rate of the pigeons decreased, The death rate of the pigeons exceeded the birth rate

Back

The death rate of the pigeons exceeded the birth rate

Front

Which pair of organisms breaks down dead organisms and returns nutrients to the environment? Options: Snake and hawk, Bacteria and fungi, Grasshopper and worm, Grass and algae

Back

Bacteria and fungi

Front

Due to its role in this ecosystem, what type of species would the grizzly bear be classified as? Options: foundation species., endangered species., keystone species., dominant species.

Back

keystone species.

Front

Approximately how much energy is available to the secondary consumers in this energy pyramid?

Back

100 kcal/ m 2 /year

Front

How do nitrogen-fixing bacteria help cycle nitrogen through ecosystems?

Back

They capture nitrogen from the atmosphere and convert it into forms that plants can use.