Q: A population of rabbits grows according to the exponential growth model. If the initial population is $$N_0 = 50$ and the intrinsic growth rate is r = 0.2$, what will the population size be after 5 years? (Use N_t$$ = $$N_0$$ $$e^{rt})$$

$$N_t = 50 e$$^{0.2 \times 5}$$ = 50 e$$^{1}$$ \approx 136$$

Question 1

Which of the following best describes the difference between weather and climate?

Accepted Answer

Weather is the short-term atmospheric conditions in a specific place and time, while climate is the long-term average of these conditions over years.

Question 2

A researcher is studying the effect of water salinity on the distribution of a fish species in a river. At which level of ecological organization is this study most likely focused?

Accepted Answer

Population

Question 3

Which of the following is an example of an abiotic factor influencing species distribution?

Accepted Answer

Soil pH limiting the growth of certain plants

Question 4

Why are the equatorial regions of Earth generally warmer than the poles?

Accepted Answer

The equator receives sunlight at a more direct angle, concentrating energy per unit area.

Question 5

Which of the following best explains how Earth's tilt causes seasons?

Accepted Answer

Earth's tilt causes different regions to receive varying amounts of sunlight throughout the year.

Question 6

A population of rabbits grows according to the exponential growth model. If the initial population is $$N_0 = 50$ and the intrinsic growth rate is r = 0.2$, what will the population size be after 5 years? (Use N_t$$ = $$N_0$$ $$e^{rt})$$

Accepted Answer

$$N_t = 50 e$$^{0.2 	imes 5}$$ = 50 e$$^{1}$$ \approx 136$$

Question 7

Which of the following is an example of ultimate causation in animal behavior?

Accepted Answer

A bird sings to attract mates, increasing its reproductive success.

Question 8

Which of the following best illustrates the concept of a keystone species?

Accepted Answer

A sea otter whose predation on sea urchins maintains kelp forest structure.

Question 9

Which of the following is an example of secondary succession?

Accepted Answer

Regrowth of a forest after a wildfire.

Question 10

Which of the following best describes the difference between resistance and resilience in ecosystem stability?

Accepted Answer

Resistance is the ability to avoid change during disturbance; resilience is the ability to recover after disturbance.

Question 11

Which of the following is NOT one of the top five threats to biodiversity (HICOP)?

Accepted Answer

Genetic drift

Question 12

A scientist observes that two species of warblers feed in different parts of the same tree. This is an example of:

Accepted Answer

Resource partitioning

Question 13

Which of the following is an example of an ecosystem service classified as a regulating service?

Accepted Answer

Flood control by wetlands

Question 14

Which of the following best describes optimal foraging theory?

Accepted Answer

Animals maximize energy gained per unit time spent foraging, considering costs and benefits.

Question 15

Which of the following is a real-world example of intrasexual selection?

Accepted Answer

Male deer fighting with antlers for access to females.

Question 16

Which of the following is the best example of an innate behavior?

Accepted Answer

A human baby grasping a finger placed in its palm.

Question 17

Which of the following is NOT a characteristic of aquatic biomes?

Accepted Answer

Soil type

Question 18

Why is genetic diversity important for populations?

Accepted Answer

It increases the likelihood that some individuals can survive environmental changes.

Question 19

Which of the following best describes a niche?

Accepted Answer

The role and position a species has in its environment, including all biotic and abiotic interactions.

Question 20

A population of bacteria in a lab is growing logistically. If the carrying capacity is $$K = 1000$$, the current population is $$N = 500$$, and the intrinsic growth rate is $$r = 0.1$$, what is the population growth rate at this moment? (Use $$\frac{dN}{dt} = rN \left(1 - \frac{N}{K}\right))$$

Accepted Answer

$$\frac{dN}{dt} = 0.1 	imes 500 	imes \left(1 - \frac{500}{1000}ight) = 25$$

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