Semester Test Part 1

Producers are found at the bottom of the pyramid because producers

• Provide energy for the consumers

• Have less mass than consumers

• Have fewer species than consumers

• Depend on consumers

In an energy pyramid, the total energy available for consumption from one trophic level to the next one about it is:

• Reduced

• Conserved

• Multiplied

• Evenly distributed

When humans move into an area, they sometimes plant grasses, flowers, or trees that are not native to the area. The nonnative species sometimes choke out the native species. Which organism would MOST likely be harmed by a loss of native plants in the area?

• the fungi that break down dead plants

• the beetles that eat a variety of grass roots

• the mosquitoes that hide under plant leaves

• the caterpillars that eat only one type of plant

Which action is an example of a change that will MOST likely decrease the population of many species?

• the preservation of more national forests

• the filling in of wetland areas for development of vacation homes

• the destruction of one city building to rebuild another in its place

• a wetter-than-normal summer in the Great Plains that causes more grass to grow

Mountain pocket gophers are native to Nevada.

Which activity of the gopher transfers energy from one trophic level to another in its ecosystem?

• Reproducing with other gopher species

• Storing food underground

• Digging burrows to live in

• Eating the roots of many plants.

The MOST common way humans contribute to the extinction of organisms is by

• rotation of crops

• use of fertilizers

• destruction of habitat

• introduction of competing species

The pyramid represents the flow of energy between populations in the ecosystem. Energy is lost as heat as it flows between the trophic levels shown.

Which population of organisms pictured below the pyramid MOST likely belongs to the trophic level containing 10J of energy?(

• Grasshopper

• Mouse

• Plant

• Snake

Lawn fertilizers often contain phosphorus. Sometimes these fertilizers runoff into lakes. Once in a lake the excess phosphorus affects algae growth and cause eutrophication (which causes a dense growth of plant life and death of animal life from lack of oxygen) in the lake. Which of the following should be expected as a result?

• It reduces algae habitat size

• It improves algae adaptability

• it increases the amount of algae in the lake

• It increases the number of trophic level algae occupy.

Use the diagram of the food web to answer the questions that follows.

The greatest amount of usable energy is found at the level that included the

• Grasshopper

• Grass

• Fox

• Falcon

Florida scrub jays are songbirds found mostly in dry, upland habitats.

During a study that lasted several years, a researcher found that the number of breeding pairs of Florida scrub jays in the study areas remained relatively constant. For approximately every 25 acres of land, there was only one breeding pair. Which is a limiting factor that MOST likely prevent the increase of the population of scrub jays in this habitat?

• The amount of food available in the area

• The ability to suitable male scrub jays as mates

• The number of daylight hours during breeding season

• The tendency of young scrub jay to remain in the same area.