Ecosystems & enviromental factors. 9th grade.

From an ecology perspective, a population is:

• The number of individuals in an ecosystem.

• The series of organisms in an ecosystem.

• The series of species in an ecosystem.

• The series of organisms of the same species in an ecosystem.

An ecosystem is a system consisting of:

• Biocenosis, the environment with its characteristics, and the interactions established between them.

• Living beings and the interactions established between them.

• Living beings and the environment they live in.

• None of the above.

The interval includes:

• An area of intolerance, an area of environmental stress and an optimal area.

• An optimal area for all populations of the ecosystem and areas for each of the specific populations.

• Different areas to those described above.

• An optimal area and two areas of environmental stress.

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The seasons, which influence temperature and the availability of water and light on land, are due to:

• The Earth's rotation and its climate.

• The Earth's tilt and rotation.

• The Earth's tilt and orbital movement.

• The Earth's tilt and latitude.

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If we talk about high biodiversity, few deciduous trees, tall grass, we are referring to:

• The rainforest (jungle).

• The Mediterranean forest.

• The savannah.

• The deciduous forest.

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The adaptation of a species, its needs, the territory it can live in, etc., are known as:

• Intraspecific interaction.

• Group adaptation.

• Ecological characteristics.

• Ecological niche.

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From an ecological perspective, everything living beings need to obtain from their environment is known as:

• Necessity.

• Demand.

• Resource.

• Requirement.

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What makes two species that use similar resources not compete?

• Both of them migrate out of season.

• Options b) or c) come about.

• One of them migrates out of season.

• They have different ecological niches.

An example of colonial association could be:

• Coral groups.

• Beehives.

• People living abroad in groups.

• Herds of elephants.

A secondary succession is formed:

• On an existing succession that has suffered disruptions from natural causes.

• On an existing succession that has not suffered disruptions from natural causes.

• On a primary succession that has not suffered disruptions from natural causes.

• On a secondary succession that has suffered disruptions from natural causes.