Q: A population of rabbits in a field has a carrying capacity ($K$) of 500 and a current population size ($N$) of 200. If the intrinsic rate of increase ($r$) is 0.1, what is the expected change in population size according to the logistic growth model?

$\Delta N = rN \left(1 - \frac{N}{K}\right) = 0.1 \times 200 \left(1 - \frac{200}{500}\right) = 12$

Question 1

Which of the following is a shared trait (synapomorphy) that unites all animals within the animal kingdom?

Accepted Answer

Multicellularity with specialized tissues

Question 2

Fungi play a crucial role in ecosystems as decomposers. Which process best describes their method of nutrient acquisition?

Accepted Answer

Absorption of nutrients after external digestion

Question 3

Which of the following best describes the difference between fundamental and realized niches?

Accepted Answer

The realized niche is the actual space an organism occupies due to biotic interactions, while the fundamental niche is the potential space it could occupy.

Question 4

Which equation would you use to model exponential population growth, and what does each variable represent?

Accepted Answer

$N_{t+1} = N_t + rN_t$ where $N_t$ is population size at time $t$, $r$ is the per capita growth rate

Question 5

Which of the following is an example of mutualism?

Accepted Answer

Bees pollinating flowers while obtaining nectar

Question 6

During the Cambrian explosion, which major evolutionary milestone occurred in animals?

Accepted Answer

The rapid diversification of animal body plans and the appearance of most major animal phyla

Question 7

Which of the following best describes the process of sexual selection?

Accepted Answer

Selection for traits that increase reproductive success, often through mate choice or competition

Question 8

Which of the following is a density-dependent factor that can regulate population size?

Accepted Answer

Disease transmission

Question 9

Which formula would you use to calculate Net Primary Productivity (NPP) in an ecosystem?

Accepted Answer

$NPP = GPP - R$ where $GPP$ is gross primary productivity and $R$ is respiration

Question 10

Which of the following is NOT a major threat to biodiversity?

Accepted Answer

Natural selection

Question 11

A population of rabbits in a field has a carrying capacity ($K$) of 500 and a current population size ($N$) of 200. If the intrinsic rate of increase ($r$) is 0.1, what is the expected change in population size according to the logistic growth model?

Accepted Answer

$\Delta N = rN \left(1 - \frac{N}{K}ight) = 0.1 	imes 200 \left(1 - \frac{200}{500}ight) = 12$

Question 12

Which of the following best explains why amphibians are considered good bioindicators of ecosystem health?

Accepted Answer

They have permeable skin and complex life cycles sensitive to environmental changes.

Question 13

Which of the following is an example of a proximate explanation for animal behavior?

Accepted Answer

Birds migrate because changes in day length trigger hormonal changes.

Question 14

Which of the following is a characteristic of K-selected species?

Accepted Answer

Low reproductive rate and high parental investment

Question 15

Which of the following is a direct consequence of anthropogenic global climate change on ecosystems?

Accepted Answer

Shifts in species distributions and altered ecosystem function

Question 16

Which of the following best describes the role of keystone species in a community?

Accepted Answer

Their impact on community structure is disproportionately large relative to their abundance.

Question 17

Which of the following is a major function of the nitrogen cycle in ecosystems?

Accepted Answer

Conversion of nitrogen gas into usable forms for organisms

Question 18

Which of the following is an example of commensalism?

Accepted Answer

A remora fish attaching to a shark and feeding on scraps

Question 19

Which of the following is a real-world example of competitive exclusion?

Accepted Answer

Two species of barnacles occupying different zones on a rocky shore due to competition

Question 20

Which of the following is a strategy to mitigate the major threats to biodiversity?

Accepted Answer

Establishing protected areas and wildlife corridors

General Biology II: Final Exam Study Guide – Fungi, Animal Diversity, Ecology, and Ecosystems

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