Unit #2 :Ecology Test

All the different species with an ecosystem are collectively referred to as the

• niche

• community

• consumers

• population

Which term includes the three terms that follow it?

• population: community, ecosystem, organism

• community: ecosystem, organism, population

• ecosystem: organism, population, community

• organism: ecosystem, community, population

Which statement best describes a situation where competition occurs in an ecosystem?

• a deer outruns an attacking wolf.

• a deer, during the winter consumes tree bark.

• a deer and a rabbit consumes grass in a field.

• a deer and a rabbit are both startled by a hawk flying overhead.

A study was made over a period of years in a certain part of the country. It showed that the area had a low amount of rainfall, a wide seasonal variation in temperature, and a short periods of daylight. These environmental factors are

• abiotic factors of little importance to living things

• abiotic factors that limit the type of organisms that live in the area

• biotic factors important to living things in the area

• biotic factors that are affected by the abiotic factors

The organisms the prevent Earth from becoming covered with the remains of dead organisms are known as

• herbivores

• parasites

• autotrophs

• saprophytes

An environment can supply only as many organisms as the available energy, minerals, and oxygen will allow. Which term is best described by this account?

• biological feedback

• carrying capacity

• homeostatic control

• biological diversity

The diagram represents a model of a food pyramid.

Which statement best describes what happens in this food pyramid?

• more organisms die at higher levels than at lower levels, resulting in less mass at higher levels.

• energy is lost to the environment at each level, so less mass can be supported at each higher level.

• when organisms die at higher levels, their remains sink to lower levels, increasing the mass of lower levels

• organisms decay at each level, and thus less mass can xbe supported at succeedingly higher levels

In December 2004, a tsunami ( giant wane) destroyed many of the marine organisms along the coast of the Indian Ocean. What can be expected to happen to the ecosystem that was most severely hit by the tsunami?

• the ecosystem will change until a new stable community is established

• succession will continue in the ecosystem until one species of marine organism is established

• ecological succession will no longer occur in this marine ecosystem

• the organisms in the ecosystem will become extinct

Base your answers on the following diagram for questions 9

The cycle represented by the diagram is the

• nitrogen cycle

• carbon cycle

• water cycle

• oxygen cycle

Nitrifying bacteria in the soil are represented by the letter

• A

• E

• C

• D