Population Ecology

Front

plants --> rabbits --> foxes --> hawks Which of these is most likely to occur to the populations immediately after a wildfire burns the environment?

• hawks and foxes increase
• hawks decrease; foxes increase
• plants decrease; rabbits increase
• plants and rabbits decrease

Back

plants and rabbits decrease

Front

In the desert, cactus wrens often build nests in cholla cacti to avoid predators; this does not hurt the cacti. What type of relationship is this?

Back

commensalism

Front

This graph best represents which ecological concept?

Back

carrying capacity

Front

Over a period of 200 years, a mountain pond transformed into a meadow. Why do new communities replace the old communities?

Back

Abiotic characteristics of the habitat changed.

Front

The graph shows birth and death rates for a population from 1900 to 2000. What has the population done? Options: increased, decreased, remained constant, increased until 1930 then decreased.

Back

increased

Front

Which of these types of organisms would most likely have the largest population in a pond ecosystem? Options: algae, fish, frogs, snakes

Back

algae

Front

Why is there a greater diversity of life found in zone 1 of a lake ecosystem?

Back

It receives the most sunlight.

Front

A scientist measured flower heights at many different elevations on a mountain. Which statement best describes the pattern of growth for flowers during the experiment? Options: flower height is unaffected by elevation, flower height decreases with decreasing elevation, flowers grow taller around elevations of 3000 meters, flower height increases with increasing elevation.

Back

flowers grow taller around elevations of 3000 meters

Front

The graph shows rabbit population over a 7 year period. What is the approximate carrying capacity for rabbits? Options: 200, 400, 500, 600

Back

500

Front

What do the arrows in the diagram represent? Options: flow of water, flow of sunlight, flow of energy, flow of bacteria

Back

flow of energy