AP Unit 8.2: Energy Flow Through Ecosystems

Multiple Choice

Which statement is false about endotherms and ectotherms?

• Ectotherms maintain a body temperature that matches their environment.

• Endotherms maintain a constant body temperature.

• Ectotherms can vary their body temperature using thermoregulatory behaviors.

• Endotherms require more energy than ectotherms.

Multiple Choice

Which statement is true about endotherms versus ectotherms?

• Ectotherms need to consume more food than similar-sized endotherms.

• Endotherms can occupy a wider range of habitats than ectotherms.

• Large endotherms require less energy than small ectotherms.

• Endotherms can go for long periods of time without eating.

Multiple Choice

What is the relationship between mammal size and metabolic rate?

• Larger mammals have a lower metabolic rate than smaller mammals.

• Smaller mammals have a higher metabolic rate than larger mammals.

• Larger mammals have a lower per-kg metabolic rate than smaller mammals.

• Smaller mammals have a lower per-kg metabolic rate than larger mammals.

Multiple Choice

Which statement is true about how energy availability affects reproductive strategies of organisms?

• Animals can reproduce at any time of the year.

• Larger plants such as trees commonly reproduce in their first year of life.

• Plant reproduction is not affected by energy availability.

• Animals reproduce when food is available.

Multiple Choice

The body temperature data in the table were collected from two different species in the same habitat over the course of the same 15 hours of the same day. Numbers in parentheses are +/- 2 standard errors of the mean.

Determine the average body temperature of species 1 over the course of this experiment.

• 24C

• 25C

• 26C

• 28C

Multiple Choice

The body temperature data in the table were collected from two different species in the same habitat over the course of the same 15 hours of the same day. Numbers in parentheses are +/- 2 standard errors of the mean.

Which conclusion is supported by the data in the table?

• Species 1 regulates its body temperature.

• Species 2 regulates its body temperature.

• Species 1 had its lowest body temperature at the coldest time of the day.

• Species 2 had its highest body temperature at the coldest time of the day.

Multiple Choice

Blue jays are a species of bird that lives in the eastern and central United States. Students in an AP Biology class observed a population of blue jays near their school eating acorns, berries and seeds.

Ecologists often follow the movement of energy from one trophic level to another. If we consider the energy of the acorns, berries, and seeds to be 100%, what portion of that energy would be expected to be in the biomass of the blue jays that consume these food sources?

• 1%

• 10%

• 50%

• 100%

Multiple Choice

Blue jays are a species of bird that lives in the eastern and central United States. Students in an AP Biology class observed a population of blue jays near their school eating acorns, berries and seeds.

The students observe that hawks prey upon the blue jays living near their school. What portion of the energy of the acorns, berries, and seeds would be expected to be in the biomass of the hanks that consume the blue jays?

• 1%

• 10%

• 50%

• 100%

Multiple Choice

In the habitat being studied, the total mass of the grass is 8000kg. Calculate the total mass of the hawk population in the habitat.

• 8kg

• 80kg

• 800kg

• 8000kg