Question 1

Which of the following best describes the focus of ecosystem ecology?

Accepted Answer

The flow of energy and cycling of nutrients among living and nonliving components in an area.

Question 2

A scientist is studying how the number of prairie dogs per square kilometer changes over time in a grassland. Which level of ecological study does this represent?

Accepted Answer

Population ecology

Question 3

Which of the following is an example of mutualism?

Accepted Answer

Bees collecting nectar from flowers and pollinating them

Question 4

Which of the following is NOT an abiotic factor influencing the distribution of life?

Accepted Answer

Nitrogen-fixing bacteria

Question 5

A fish species produces millions of eggs, but only a few survive to adulthood. Which survivorship curve best describes this species?

Accepted Answer

Type III

Question 6

Which of the following scenarios best illustrates biological magnification?

Accepted Answer

Mercury concentrations increase in fish-eating birds compared to the fish they eat.

Question 7

You discover a new plant that requires at least 300 cm of rainfall per year and cannot survive temperatures below $20^\circ$C. In which biome did you most likely find it?

Accepted Answer

Tropical rainforest

Question 8

Which of the following best describes a community in ecological terms?

Accepted Answer

All the organisms living in your home

Question 9

Which of the following is a likely consequence of deforestation on atmospheric $CO_2$ levels?

Accepted Answer

Increase in atmospheric $CO_2$ due to reduced carbon uptake by plants

Question 10

Which of the following aquatic zones is characterized by little or no light and the absence of photosynthesis?

Accepted Answer

Aphotic zone

Question 11

Which of the following best explains why there is so much rainfall in the tropics?

Accepted Answer

Warm, moist air rises at the equator, cools, and releases moisture as rain.

Question 12

Which of the following is an example of an invasive species and its impact?

Accepted Answer

Bullfrogs introduced to a new area outcompete native frogs, reducing amphibian diversity.

Question 13

Which interspecific interaction is described when one species benefits and the other is neither helped nor harmed?

Accepted Answer

Commensalism

Question 14

Which of the following is a pelagic animal of the aphotic zone?

Accepted Answer

Deep-sea squid

Question 15

Which of the following best describes the effect of increased atmospheric $CO_2$ on oceans?

Accepted Answer

It acidifies oceans, harming marine habitats.

Question 16

A population pyramid with a broad base and narrow top most likely indicates:

Accepted Answer

A rapidly growing population with high birth rates

Question 17

Which of the following is a real-world example of biological control?

Accepted Answer

Introducing ladybugs to control aphid populations in a garden

Question 18

Which of the following best describes the main difference between a food chain and a food web?

Accepted Answer

A food web shows multiple interconnected food chains, while a food chain shows a single pathway of energy flow.

Question 19

Which of the following populations is most likely to survive rapid climate change?

Accepted Answer

A population with high genetic variability and short life spans

Question 20

Which of the following best describes the water cycle’s role in ecosystem ecology?

Accepted Answer

It cycles water between land, atmosphere, and oceans, supporting life and nutrient flow.

Introduction to Ecology: Levels, Interactions, and Applications

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