OpenSciEd Ecosystems

A student makes the following observations: *trees *plants *mosquitos *sharks *manatees *lake *sun *63 degrees *rainy What is the level of organization they observed?

• organism

• Community

• ecosystem

• population

Tags

NGSS.MS-LS2-3

Food chains show energy transfer between organisms. The size of a food chain can vary, yet there is a limit to the number of levels that a food chain can reach. Why is there a limit to the number of levels that a food chain can reach?

• Plants are not infinite in number.

• Producers are limited by consumers.

• Carnivores are too large to be eaten.

• Energy is lost at each trophic level.

Tags

NGSS.MS-LS2-3

What is shown in the image below?

• food chain

• trophic chain

• food web

• energy web

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-2

What might happen to the organisms in the food web below if the number of phytoplankton and vegetation drastically decreased?

• The small fish and wading birds would be affected.

• Only the small fish would be affected.

• The small fish, bivalves, and invertebrates would be affected.

• The entire food web would be affected.

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

NGSS.MS-LS2-1

Decomposers are important to ecosystems because they

• return vital nutrients to the ecosystem

• capture energy from the Sun

• are producers

• can be omnivores

Tags

NGSS.MS-LS2-3

What is the smallest level of organization within an ecosystem?

• population

• community

• ecosystem

• organism

Which of the following is an example of the community level of organization?

• a school of fish

• a school of fish, the ocean, a shark, the dirt, and seaweed

• a school of fish, a shark, and seaweed

• a fish

Which of the following groups are abiotic?

• bird, fish, tree, frog

• shark, manatee, fly, lizard

• water, shark, tree, soil

• water, sun, 30 degrees, soil

Tags

NGSS.MS-LS2-3

Which of the following is a biotic factor?

• a bird flying

• a stream flowing

• an airplane taking off

• a thunderstorm

Which of the following is a biotic factor that humans interact with everyday?

• oxygen we inhale

• the water we use to take a shower

• the food we eat

• the dirt we walk on