Question 1

Which of the following best describes the difference between endothermy and ectothermy?

Accepted Answer

Endotherms generate most of their body heat metabolically, while ectotherms rely primarily on external heat sources.

Question 2

Thermogenic plants, such as the corpse flower, produce heat in their inflorescences. What is the primary evolutionary advantage of this trait?

Accepted Answer

It attracts pollinators by volatilizing scent compounds and mimicking decaying flesh.

Question 3

In the context of energy budgets, which equation best represents the allocation of total energy intake ($$E_{in}) in an $$organism?

Accepted Answer

$$E_{in} = E_{growth} + E_{reproduction} + E_{maintenance}$$

Question 4

A weasel's long, thin body increases its rate of heat loss compared to other mammals of similar size. Why might this trait persist evolutionarily?

Accepted Answer

The increased heat loss is offset by the ability to access prey in small burrows, increasing overall fitness.

Question 5

Which of the following is NOT a factor that directly affects an organism's total energy intake?

Accepted Answer

Rate of protein turnover

Question 6

Why do plants possess alternative oxidase (AOX) in their mitochondria, and what is a unique property of this enzyme?

Accepted Answer

AOX provides a cyanide-insensitive pathway for electron transport, allowing continued respiration when the main pathway is blocked.

Question 7

Which of the following best explains the concept of evolutionary fitness as used in energy budget analysis?

Accepted Answer

The contribution an individual makes to the next generation relative to every other individual in the population.

Question 8

A predator must decide between two foraging strategies: 'sit and wait' or 'active foraging.' Which trade-off is most likely to influence this decision?

Accepted Answer

'Active foraging' increases the volume of prey encountered but also raises metabolic costs and risk of predator encounters.

Question 9

Which of the following is an example of a plant secondary metabolite used for defense?

Accepted Answer

Caffeine

Question 10

If an animal increases its allocation of energy to maintenance (e.g., defense and homeostasis), what is the most likely consequence for its energy budget?

Accepted Answer

Less energy will be available for growth and reproduction, due to trade-offs.

Question 11

Which of the following best describes the cost of protein turnover in cellular homeostasis?

Accepted Answer

It accounts for about 20% of basal metabolic rate, as older proteins are broken down and replaced.

Question 12

A lion (generalist predator) and an anteater (specialist predator) are compared in terms of foraging strategy. Which statement is most accurate?

Accepted Answer

Specialists may be more efficient at exploiting a specific food source, but are at greater risk if that food becomes scarce.

Question 13

Which of the following is a likely cost associated with the use of chemical defenses in animals?

Accepted Answer

Increased energy expenditure for synthesis and storage of toxins

Question 14

Why might an animal that consumes low-quality food (e.g., a koala eating eucalyptus leaves) have a lower energy budget for reproduction?

Accepted Answer

Low-quality food provides less energy, so more must be allocated to maintenance and digestion, leaving less for reproduction.

Question 15

Which of the following equations best represents the trade-off principle in energy allocation?

Accepted Answer

$$E_{total} = E_{maintenance} + E_{growth} + E_{reproduction}$$

Question 16

Which of the following is a likely benefit of morphological specializations such as large canine teeth in carnivores?

Accepted Answer

They increase efficiency in capturing and processing prey, improving energy intake.

Question 17

Which of the following best explains why the cost of digestion (specific dynamic action) is higher after a large meal?

Accepted Answer

Larger meals require more energy for mechanical breakdown and enzymatic processing.

Question 18

Which of the following is NOT a plant defense mechanism?

Accepted Answer

Camouflage

Question 19

Which of the following scenarios best illustrates a cost/benefit analysis in animal behavior?

Accepted Answer

A bird migrates thousands of kilometers to access abundant food, despite the high energy cost of migration.

Question 20

Which of the following is a direct consequence of increased allocation of energy to survival (maintenance) in the energy budget model?

Accepted Answer

Decreased energy available for growth and reproduction

Energy Budgets, Thermoregulation, and Resource Allocation in Organisms

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