Dynamic Ecosystems Question Preview (ID: 62334)


7th Grade. TEACHERS: click here for quick copy question ID numbers.

The living and nonliving things in an area make up the
a) ecosystem
b) community
c) population
d) species

All the organisms of the same species that live in the same area at the same time
a) population
b) species
c) community
d) ecosystem

The potential growth of a population if it could grow in perfect conditions with no limiting factors
a) biotic potential
b) carrying capacity
c) climax community
d) overpopulation

A tick attaches itself to a person and drinks its blood. It passes on Lyme disease to the person. This is an example of
a) parasitism
b) predator-prey relationship
c) competition
d) commensalism

___ are formed when organisms of the same species work together for a common purpose
a) cooperative relationships
b) predator-prey relationshipa
c) mutualistic relationships
d) commensalistic relationships

Usually, changes to ecosystems happen
a) gradually
b) quickly
c) suddenly
d) never

Which of the following is first to grow during succession?
a) small plants
b) shrubs and bushes
c) trees
d) rocks

Ecological succession in new areas of land with little or no soil or vegetation.
a) primary succession
b) secondary succession
c) dynamic succession
d) volcano succession

What helps to fill the bottom of a pond?
a) both
b) runoff containing dirt
c) decaying organisms
d)

What can happen if too much sediment enters a body of water
a) all of the above
b) habitat loss
c) make it difficult to see
d) block sunlight for aquatic plants

How are nutrients added to water?
a) both
b) decaying organisms
c) runoff that includes fertilizers
d)

Humans can contribute to eutrophication
a) true
b) false
c)
d)

Any activity that takes resources from nature is called
a) resource extraction
b) dynamic equilibrium
c) commensalism
d) competition

Cropland that has been left alone will go through
a) secondary succession
b) primary succession
c) dynamic succession
d) climax succession

A close, long-term relationship between two species that usually involves an exchange of food or energy
a) symbiosis
b) competition
c) cooperative relationship
d) dynamic equilibrium

If an organism has decreased in numbers but isn't close to being extinct, it is considered
a) threatened
b) endangered
c) critically endangered
d) non-native

How is a predator-prey relationship beneficial to the prey?
a) more resources are available when the predators eliminate weak or injured prey.
b) the predator will leave the prey alone once it eats a few
c) the prey get exercise running from the predators
d) all of the above

Any material broken down by the process of weathering and then transported to a different place
a) sediment
b) prey
c) hosts
d) dirt

A symbiotic relationship that benefits one species but doesn't harm or benefit the other
a) commensalism
b) mutualism
c) communism
d) parasitism

Ravens like to eat the meat that wolves kill. The wolves scare the ravens away when they try to eat. This is
a) competition
b) commensalism
c) predator-prey relationship
d) cooperative relationship

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