Population Density and Biodiversity

Population density is the

• number of individuals per unit of area.

• ratio of one species to the total number of species.

• total number of populations in an area.

Which of the following does not increase biodiversity?

• high food availability

• abundant resources

• surge in one specific population

This is the process where the flow of carbon dioxide and oxygen has been disrupted by uncontrolled growth of algae.

In a lake fully covered with dead algae, which is a limiting factor for fishes to grow their population?

• too much carbon dioxide

• other fishes

• fresh algae

These are factors that limit the growth of a population.

When birthrate is higher than death rate, population ___________.

• grows

• shrinks

• declines

When a robin emigrates to look for new nesting place, the population it left will ________.

• increase

• shrink

• grow

___________ is the amount of variation in an ecosystem.

As populations vary, the biodiversity of an area changes.

• True

• False

Give one human factor that can cause change in the biodiversity of an area.