Question 1

Which of the following best explains why the Earth experiences different seasons throughout the year?

Accepted Answer

Because the Earth's axis is tilted at 23.5 degrees relative to its orbital plane.

Question 2

Why are the tropics generally warmer than the poles?

Accepted Answer

More sunlight reaches the surface in the tropics due to the angle of solar radiation.

Question 3

Which of the following best describes a biome?

Accepted Answer

A major grouping of plant and animal communities defined by dominant vegetation and distinctive abiotic conditions.

Question 4

What is the primary reason deserts are typically found at 30° north and south latitude?

Accepted Answer

Hadley cell circulation causes dry air to descend, warming and absorbing moisture.

Question 5

How do coastal mountain ranges affect the climate of nearby regions?

Accepted Answer

They create a rain shadow, causing high precipitation on the windward side and dry conditions on the leeward side.

Question 6

Which of the following is a direct result of the pyramid of productivity in ecosystems?

Accepted Answer

Energy transfer between trophic levels is about 10%, resulting in fewer individuals at higher trophic levels.

Question 7

Which equation correctly represents the per-capita rate of increase ($$r) in a $$population?

Accepted Answer

$$r = \frac{\Delta N}{\Delta t}$$

Question 8

A population of birds colonizes a new island with abundant resources and no predators. Which type of population growth is most likely to occur initially?

Accepted Answer

Exponential growth

Question 9

Which of the following best describes the carrying capacity ($$K) of a $$population?

Accepted Answer

The maximum number of individuals that can be supported in a habitat over a sustained period.

Question 10

According to the Theory of Island Biogeography, which island would have the highest species richness?

Accepted Answer

A large, nearshore island

Question 11

Which process is primarily responsible for the cycling of carbon from the atmosphere into living organisms?

Accepted Answer

Photosynthesis

Question 12

Which of the following is an example of a density-dependent factor affecting population growth?

Accepted Answer

Competition for food as population size increases

Question 13

Which of the following best describes mutualism?

Accepted Answer

An interaction where both species benefit

Question 14

If two species have completely overlapping niches and compete asymmetrically, what is the likely outcome?

Accepted Answer

The weaker competitor will be excluded from the niche (competitive exclusion principle).

Question 15

Which of the following is a real-world example of a biogeographic barrier?

Accepted Answer

The Sahara Desert separating African and Eurasian species

Question 16

Which of the following is a likely consequence of deforestation on the carbon cycle?

Accepted Answer

Decreased capacity for CO2 uptake and increased atmospheric CO2

Question 17

Which of the following best explains why tropical rainforests have high species richness?

Accepted Answer

They receive high solar energy and precipitation, supporting high net primary productivity.

Question 18

Which of the following is an example of a top-down control in an ecosystem?

Accepted Answer

A large lynx population reduces the hare population, which then causes a decline in lynx numbers.

Question 19

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

Accepted Answer

Weather is the specific short-term atmospheric conditions; climate is the prevailing, long-term conditions.

Question 20

Which of the following is a likely effect of El Niño events on global climate patterns?

Accepted Answer

Increased rainfall in the Americas and drought in the western Pacific.

Ecology: Climate, Biogeography, Population, and Community Dynamics

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