Exam 19: Ecosystem Essentials

Which of the following is a biotic component of an ecosystem?

Plants on the floor of a rain forest often have very dark-green leaves.This colouration is due to the presence of ________ amounts of chlorophyll in the leaves which is necessitated by the fact that the amount of light reaching the forest floor is ________.

Given the way in which humans are altering the environment,destroying species,using resources,and generating wastes,our relationship with planet Earth is akin to that of a ________ relationship.

A self-regulating association of living plants and animals and their nonliving physical environment is termed a(n)

The fact that no two organisms can occupy the same niche successfully in a stable community is a statement of which general ecological principle?

Which of the following results from the competition for sunlight in a plant community?

Which of the following is true of nitrogen?

The different spatial distribution of coast redwoods and red maple trees illustrates the operation of

There are fig trees in the tropical rain forest that are pollinated by only one species of wasp,and these wasps are entirely dependent upon the one species of fig tree they pollinate for their food supply.This is an example of a(n)________ relationship.

________ is the specific physical location of an organism,whereas the function,or occupation,of a life-form within a given community is called its ________.

Which of the following is not true regarding the possible effects of climate change?

The material inputs of photosynthesis are the same as the outputs of the process of respiration.

Loss of phytoplankton in the ocean would constitute a(n)________ effect on the marine ecosystem because ________.

Chlorophyll does not use green light as an energy source.

An individual species must satisfy several aspects of its niche,such as feeding and reproduction.

Because of biological amplification of pollutants,you could get sick from eating oysters,even if the oysters themselves were not sick.

The loss of species throughout the world constitutes a loss of biodiversity,which could cause a ________ in ecosystem stability and a ________ in productivity.

Humans are responsible for relatively little nitrogen fixation.

The openings in the surfaces of leaves are known as ________,and the cells which control the size of the openings are called ________.

In the savanna regions of Africa,elephants dig holes in dry river beds to create water holes that also provide water for other animals that would otherwise die during the dry season.The location where the elephants live is an example of a(n)________,and the role they play is an example of a(n)________.