All AP Biology Resources
Example Questions
Example Question #91 : Ecology
Which of the following is true regarding keystone species?
They are always the most abundant species in an ecosystem
The presence of a keystone species collapses the ecosystem
There will be no effect if a keystone species is removed from an ecosystem
Keystone species have a large effect on the ecosystem
Keystone species have a large effect on the ecosystem
Despite their relatively small abundance, keystone species have a large impact on the environment in which they inhabit. If a keystone species is removed from an ecosystem, then there may be a large change in ecosystem’s stability.
Example Question #92 : Ecology
How does human initiated deforestation impact ecosystems?
Decrease in soil erosion
None of these
Decrease in greenhouse gas emissions
Increase in biodiversity
None of these
Deforestation can be defined as the removal of forests by humans. Deforestation has many negative environmental impacts including soil erosion, a decline in biodiversity, and an increase in greenhouse gas emissions.
Example Question #92 : Ecology
Which of the following is true regarding tropical rainforest biomes?
There are three seasons: rainy, dry, and winter
There is little rainfall
Soil is nutrient-rich
They have the greatest biodiversity
They have the greatest biodiversity
Tropical rainforest biomes have the greatest biodiversity of all biomes. They have only two seasons (rainy and dry) and the soil in these environments is generally nutrient-poor. Tropical rainforests also have a multi-layered canopy that allows little light to penetrate to the ground.