Ecosystem Ecology

The sum total of a population's use of the biotic and abiotic resources of its habitat constitutes its

• environment.

• evolution.

• range.

• niche.

In an ecosystem, you would expect to find interspecific competition between

• males and females of a species in which both sexes occupy the same niche.

• populations of two species that occupy the same niche.

• a prey species and its predator.

• two wasp species that mimic each other's appearance.

Tags

NGSS.MS-LS2-2

Within an ecosystem, a tree is a

• secondary consumer.

• detritivore.

• primary consumer.

• producer.

Tags

NGSS.MS-LS2-3

In a food chain consisting of phytoplankton → zooplankton → fish → fishermen, the fishermen are

• secondary consumers.

• tertiary consumers.

• quaternary consumers.

• secondary producers.

Tags

NGSS.MS-LS2-2

In an average ecosystem, about how much energy is present in the organisms at a given trophic level compared to the organisms at the next higher trophic level?

• a tenth as much

• half as much

• twice as much

• ten times as much

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Given that CO2 is produced by cellular respiration, why does the amount of CO2 in the atmosphere remain relatively constant? (When answering this question, exclude the impact of human activities on atmospheric CO2.)

• CO2 is converted in photosynthesis to carbohydrates.

• CO2 is split apart during photosynthesis.

• CO2 mostly forms carbonate rocks.

• CO2 is trapped in dead organisms' bodies.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Carbon mainly cycles between the biotic and abiotic worlds through the processes of

• cellular respiration and transpiration.

• transpiration and photosynthesis.

• evaporation and photosynthesis.

• cellular respiration and photosynthesis.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Which of the following statements about the nitrogen cycle is true?

• The nitrogen cycle requires different types of bacteria.

• Nitrogen gas is converted to nitrates in plant leaves.

• Nitrogen cannot be cycled through living organisms.

• When plants and animals die, nitrogen is removed from the nitrogen cycle.

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which of the following represents a step in the nitrogen cycle?

• Nitrogen-fixing bacteria convert atmospheric nitrogen to nitrates.

• Nitrites bind to soil particles.

• Nitrogen-fixing bacteria convert atmospheric nitrogen to ammonia.

• Denitrifiers convert ammonium to atmospheric nitrogen.

Tags

NGSS.MS-LS2-3

Denitrifying bacteria convert ________ to ________.

• ammonium; nitrates

• nitrates; nitrogen gas

• nitrogen gas; nitrates

• nitrogen gas; nitrites