Question 1

Which of the following best describes the purpose of a character matrix in phylogenetic analysis?

Accepted Answer

It is used to reconstruct the phylogenetic relationships by comparing morphological traits with possible character states.

Question 2

In a study of peacock spiders (Salticidae), researchers use a cladogram. What do the taxon names at the tips of the cladogram represent?

Accepted Answer

The Genus and species included in the study.

Question 3

Which equation best describes exponential population growth?

Accepted Answer

$$dN\/dt = rN$$

Question 4

A logistic growth curve differs from an exponential growth curve because:

Accepted Answer

It incorporates carrying capacity, limiting population growth as resources become scarce.

Question 5

In a typical ecosystem food web, which statement is correct regarding energy transfer?

Accepted Answer

Energy flows from producers to primary consumers and then to higher trophic levels.

Question 6

Which of the following best illustrates the concept of an ecological niche in a competitive interaction?

Accepted Answer

The specific role and position a species has in its environment, including how it obtains food and interacts with other species.

Question 7

If two species compete for the same food resource, but one is more effective at capturing food, what is the likely outcome according to the competitive exclusion principle?

Accepted Answer

The less effective species will be excluded from the resource and may decline or go extinct.

Question 8

Which of the following is a direct consequence of energy loss at each trophic level in a food web?

Accepted Answer

There are fewer top predators than primary consumers.

Question 9

A phylogenetic tree constructed using morphological traits is most likely to be affected by which of the following?

Accepted Answer

Convergent evolution, where unrelated species evolve similar traits.

Question 10

Which of the following best describes the direction of nutrient transfer in a food web?

Accepted Answer

From producers to consumers to decomposers.

Question 11

Given the logistic growth equation $$dN\/dt = rN(1 - N\/K)$$, what does $$K$$ represent?

Accepted Answer

The carrying capacity of the environment.

Question 12

Which scenario best demonstrates the application of a character matrix in reconstructing phylogenetic relationships?

Accepted Answer

Analyzing the presence or absence of specific morphological traits across multiple species.

Question 13

If a population of spiders grows according to the exponential model, what will happen if resources suddenly become limited?

Accepted Answer

The population growth will slow and approach a carrying capacity, following a logistic curve.

Question 14

Which of the following is NOT a major participant in a typical ecosystem food web?

Accepted Answer

Abiotic factors

Question 15

A researcher observes two spider species in Australia competing for the same prey. Species A is more efficient at capturing prey. According to ecological theory, what is most likely to happen over time?

Accepted Answer

Species B will evolve to exploit a different resource or niche.

Question 16

Which of the following best explains why energy transfer in a food web is inefficient?

Accepted Answer

Most energy is lost as heat during metabolic processes.

Question 17

Which of the following would be the best evidence for reconstructing the phylogeny of peacock spiders?

Accepted Answer

A matrix of morphological traits with two possible character states for each trait.

Question 18

In a food web, which organism is most likely to receive the least amount of energy?

Accepted Answer

Top predator

Question 19

Which of the following statements about population growth curves is correct?

Accepted Answer

Exponential growth occurs when resources are unlimited, while logistic growth occurs when resources are limited.

Question 20

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

Accepted Answer

One species of barnacle outcompeting another for space on a rocky shore, leading to the exclusion of the less competitive species.

General Biology: Phylogeny, Population Growth, and Ecosystem Interactions

Guida di studio - Domande di pratica

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