Ecosystem test

If the population of a country grows at a rate of approximately 5% per year, the number of years required for the population to double is?

15 years (70/5)

Exemplified by moss growing on a tree trunk in a forest

Commensalism

Exemplified by starlings displacing bluebirds from nesting sites

Competition

This identifies the two factors thought to be the most harmful to biodiversity.

Destruction of habitat and invasion by nonnative species

A scientist measures the circumference of acorns in a population of acorn trees and discovers that the most common circumference is 2 cm. What would you expect the most common circumference to be after 10 generations of disruptive selection?

Greater than 2 cm and less than 2 cm

This invasive species decimated the fish populations of the Great Lakes

Lamprey

Exemplified by bees consuming nectar and carrying pollen from one flower to another

Mutualism

Exemplified by ticks feeding on a deer

Parasitism

The human population is an example of...

Positive feedback loop

In a kelp bed ecosystem off the coast of California one species seems to be the most important in maintaining the normal status of the ecosystem. What organism is it and what is the term for this kind of species in an ecosystem?

Sea otter, keystone species

This organism in Virginia is supposed to be killed and not released back into the environment. It can swim and walk.

Snake head fish

Why do introduced species often become pests?

They displace native species

Which species found at the Frontier Culture museum was not introduced?

Walnut tree

The K in k-selected stands for

carrying capacity

This growth increases forever

exponential

The r in r-selected stands for

growth rate

What is a biotic factor of the environment?

leaf growth

Which growth increases by a constant percentage per unit of time?

logistic

Groups of organisms with high biotic potential such as mosquitos are referred to as...

r-selected