APES Nutrients & Energy Practice

In an ecosystem with owls and mice, what would happen if the mouse population increased?

• the owl population would not be affected

• the owl population would increase

• the owl population would decrease

• it is impossible to tell

When habitats and niches overlap, animals compete for...

• nothing

• resources

• everything

• habitat

Most of the nutrients in a tropical rain forest are found in plants so, 

• the rain forest soil is very rich.
• there are few animals in the rain forest.
• the rainforest soil is poor in nutrients
• there are few plants in the rainforest.

Which has the highest net productivity?

• Desert

• Tundra

• Savannah

• Tropical rain forest

The total rate of photosynthesis in a given area.

• cellular respiration

• net primary productivity

• gross primary productivity

• primary productivity

Which nitrogen cycle process is occurring when bacteria convert ammonium to nitrite and then into nitrate?

• nitrogen fixation

• nitrification

• denitrification

• ammonification

• assimilation

Which best describes the concept of net primary production?

• total amount of energy available from the Sun

• total amount of cellular respiration conducted within an ecosystem

• energy captured minus energy lost

• total amount of energy available from the producer

In a food pyramid, which organism can be found on the bottom?

• Primary Consumers

• producers

• Secondary Consumers

• Herbivores

The net annual primary productivity of a particular wetland ecosystem is found to be 10,000 kcal/m2 per year. If respiration by the aquatic producers is 21,000 kcal/m2 per year, what is the gross annual primary productivity for this ecosystem, in kcal/m2 per year?

• 11,000

• 21,000

• 31,000

• 41,000

Which of the following is the approximate efficiency of the energy transfer as energy flows through the food chain?

• 1 percent

• 90 percent

• 50 percent

• 10 percent