Ecosystems

The production of ammonia by bacteria during the decay of nitrogen-containing urea is called...

• assimilation

• ammonification

• nitrification

• denitrification

Tags

NGSS.MS-LS2-3

Animals that feed on plants are at least in which of the following?

• first trophic level

• second trophic level

• third trophic level

• fourth trophic level

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-2

Grizzly bears, snakes, and worms can be members of the same...

• species

• trophic level

• ecosystem

• none of the above

Tags

NGSS.MS-LS2-2

The dry weight of tissue and organic matter in an ecosystem.

The number of trophic levels in an ecological pyramid...

• is limitless

• is limited by the amount of energy that is lost at each trophic level

• never exceeds four

• never exceeds three

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6

All organisms that live in a particular place and the physical aspects of that place make up a(n)...

• ecosystem

• habitat

• community

• food chain

These release nutrients back to the environment to be recycled by other organisms.

The movement of substances, such as water and nitrogen, in a circular path between the nonliving environment and living organisms is called...

• a reservoir pathway

• photosynthesis

• a biogeochemical cycle

• succession

Tags

NGSS.MS-LS2-3

NGSS.MS-ESS2-4

The number of species living in an ecosystem is referred to as...

• succession

• biodiversity

• the food chain

• productivity

Tags

NGSS.MS-LS2-5

In a typical primary succession initiated by a retreating glacier,

• lichens and mosses precede trees

• the first plants are stunted by mineral deficiencies

• it takes about 10 years for trees to be able to thrive

• all of the above