Grade 7 Sci Review Topics 5 and 6 - Ecosystems

The first species to populate an area.

• primary species

• pioneer species

• secondary species

Which is a pioneer species?

• lichen

• moon

• albatross

Changes that happen in an existing ecosystem that is disturbed.

• succession

• primary succession

• secondary succession

• tertiary succession

A relationship in which one species benefits and the other species is neither helped or harmed.

• parasitism

• mutualism

• commensalism

• geocentrism

The role of an organism in its habitat.

• niche

• stick

• succession

• tertiary succession

An interaction where one organism kills another for food or nutrients.

• predation

• mutualism

• commensalism

• geocentrism

The number and variety of species in an area.

• university

• adversity

• biodiversity

A species that influences the survival of many other species in an ecosystem.

• primary species

• pioneer species

• endangered species

• keystone species

Which is a positive impact humans have had on biodiversity?

• deforestation

• overfarming

• overfishing

• protecting endangered species

Which is a negative impact humans have had on biodiversity?

• reforestation

• ecological restoration

• overfishing

• conservation