Question 1

Which of the following best describes the difference between a community and an ecosystem in ecology?

Accepted Answer

A community includes all populations of different species in an area, while an ecosystem includes both these populations and the abiotic factors.

Question 2

Which process in the carbon cycle is primarily responsible for removing $$CO_2$$ from the atmosphere?

Accepted Answer

Photosynthesis

Question 3

A plant bends toward a window where sunlight is coming in. Which term best describes this response?

Accepted Answer

Phototropism

Question 4

In a food chain, why do the arrows point from the grass to the grasshopper?

Accepted Answer

Because energy flows from the grass to the grasshopper

Question 5

If a producer in an ecosystem contains 1,000 calories of energy, how much energy would be available to a secondary consumer according to the 10% rule?

Accepted Answer

$$10$$ calories

Question 6

Which of the following is a likely consequence of biomagnification in an aquatic food web?

Accepted Answer

Top predators accumulate the highest concentrations of toxins.

Question 7

Which human activity most directly increases the amount of nitrogen in aquatic ecosystems, potentially causing eutrophication?

Accepted Answer

Fertilizer runoff

Question 8

Which of the following best explains why endotherms require more food than ectotherms of similar size?

Accepted Answer

Endotherms use more energy to maintain a constant body temperature.

Question 9

Which of the following is an example of an abiotic factor affecting a biotic factor in an ecosystem?

Accepted Answer

A plant growing toward sunlight

Question 10

Which process in the nitrogen cycle converts atmospheric $$N_2$$ into a form usable by plants?

Accepted Answer

Nitrogen fixation

Question 11

A student observes that a Venus flytrap closes rapidly when an insect touches its hairs. This is an example of:

Accepted Answer

Rapid plant response

Question 12

Which of the following best describes the role of decomposers in nutrient cycles?

Accepted Answer

They recycle nutrients from dead organisms back into the ecosystem.

Question 13

Which of the following is a learned behavior in animals?

Accepted Answer

Language acquisition in humans

Question 14

Which of the following is the correct sequence of trophic levels in a typical food chain?

Accepted Answer

Producer → Primary consumer → Secondary consumer → Tertiary consumer

Question 15

Which process in the water cycle is responsible for returning water vapor to the atmosphere from plant leaves?

Accepted Answer

Transpiration

Question 16

A field receives excessive phosphate fertilizer runoff. What is the most likely ecological consequence?

Accepted Answer

Eutrophication of nearby water bodies

Question 17

Which of the following best explains why food chains rarely have more than five trophic levels?

Accepted Answer

Energy is lost at each trophic level, leaving insufficient energy for higher levels.

Question 18

Which of the following is an example of a detritivore?

Accepted Answer

Earthworm

Question 19

Which of the following human activities directly reduces the rate of photosynthesis in the carbon cycle?

Accepted Answer

Deforestation

Question 20

Which of the following best describes the process of photoperiodism in plants?

Accepted Answer

Blooming in response to the length of day or night

Ecology: Interactions, Energy Flow, and Biogeochemical Cycles

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