MP 2 Test 1 - Ecosystems & Populations

A population size is stable when

• number of births & deaths are equal

• number of births is greater than number of deaths

• number of deaths is greater than number of births

A population size is increasing when

• number of births & deaths are equal

• number of births is greater than number of deaths

• number of deaths greater than number of births

A population size is decreasing when

• number of births & deaths are equal

• number of births is greater than number of deaths

• number of deaths is greater than number of births

A population of orcas lives in the ocean. Over the last 15 years, the size of the orca population increased. What is the most likely reason for the increase in the orca population?

• more orcas were born than died

• more orcas were born due to having extra food

• more orcas died than born

• orcas starved and eventually died

A population of foxes live in a nearby forest. Over the last 15 years, the size of the fox population has decreased. What is the most likely reason for the decrease in the fox population?

• more foxes were born than died

• more foxes were born due to having extra food

• more foxes died than born

• foxes starved and eventually died

________________ term environmental effects can: change DNA, affect multiple generations, and lead to extinction

• long

• medium

• short

________term environmental effects can: effect organisms immediately, cause behavior changes, and will last 5 years or less.

• long

• medium

• short

flooding, smog, and controlled forest fires represent ________________________.

• long term environmental impacts

• medium term environmental impacts

• short term environmental impacts

loss of biodiversity, wild forest fire, development of buildings & stores, deforestation (cutting down trees) are examples of ____________

• long term environmental impacts

• medium term environmental impacts

• short term environmental impacts

Which scientific tool had the most impact on the discovery of cells?

• microscope

• telescope

• kaleidoscope

• celloscope