Unit 1.3 Review: How do populations affect each other?

The following graph shows the biomass of a community after a forest fire, which process of succession is represented by this data?

• Ecological succession

• Gradual succession

• Primary succession

• Secondary succession

An autotroph is an organism that uses light to create its own food. Knowing this what would a Chemoautotroph use to produce its own food?

• chemicals

• light

• other organisms

• soil

pH is a chemical property of water that determines what type of organism lives there. What is a possible outcome of a change of pH occuring in an aquatic habitat?

• Increase in photosynthesis from phytoplankton

• Increase in the death rate of the organisms that live there

• Increase in the birth rate of the organisms that live there.

• Increase in consumption of plankton.

What abiotic factor would cause a decrease in a population for phytoplankton?

• Increase in zooplankton

• Decrease of sunlight

• Increase in primary consumers

• Increase in sunlight

The following figure shows the mass of plants over time after a volcanic eruption. What form of succession does this graph represent?

• Secondary succession

• Primary succession

• Ecological succession

• Gradual succession

The following image shows the reality of rising sea levels. What long term effect would a rise in sea level have on the coastal ecosystem?

• Increase in biodiversity more available water

• Decrease in biodiversity due to habitat loss.

• Decrease in biodiversity due to inland predators having easier access to marine organisms.

• Increase in biodiversity due to terrestrial organisms adapting to the rising sea levels.

Which of the following events cause primary succession to occur?

• Volcanic eruption

• landslide exposing bare rock

• Hurricane

• Forest fire

A unionid is a freshwater mussel, which statement best explains the change in the native unionid population?

• The carrying capacity of the unionid was reached.

• The introduction of the zebra mussel has decreased the amount of available resources for the Native unionid

• The introduction of the zebra mussel has increased the amount of available resources for the native unionid

• Zebra mussels are emigrating allowing for the native unionid population to shift.

The following graph shows the population of red squirrel over time. Which statement best represents the reason for the drop in the red squirrel population?

• The increase in predators in the area

• The introduction of the invasive grey squirrel

• Increase in global warming

• Loss of habitat due to urbanization

Based on the energy pyramid provided which trophic level would parasites fall under?

• Producers

• Primary consumers

• Secondary consumers

• Tertiary consumers