Ecosystems and Interconnectedness

Why is less energy available to organisms at higher trophic levels in an ecosystem?

• Higher trophic levels consume more efficiently.

• Higher trophic levels receive more radiant energy.

• Energy is lost as heat at each trophic level.

• Decomposers generate energy.

Tags

NGSS.MS-LS2-3

Which of the following organisms uses photosynthesis to get the energy it needs to survive?

• grass

• rabbit

• fox

• snake

Tags

NGSS.MS-LS1-6

What is the main difference between primary and secondary ecological succession?

• Primary begins WITHOUT soil; Secondary begins WITH soil

• Primary is the first state and secondary is the second stage

• Primary builds plant community; secondary builds animal community.

• Primary begins WITH soil; Secondary begins WITHOUT soil

Which of the following organisms is a primary consumer?

• grass

• rabbit

• fox

• snake

Tags

NGSS.MS-LS2-2

How much energy is passed on to each trophic level in an energy pyramid?

• 10%

• 90%

• 50%

• 80%

Tags

NGSS.MS-LS2-3

Identify the correct stages of the Nitrogen Cycle

a

b

c

d

Denitrification

Ammonification

Nitrification

Nitrogen Fixation

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which of the following explains how the 2nd law of thermodynamics relates to energy transformations within ecosystems?

• It explains the efficiency of energy transformations in ecosystems.

• It describes the increase in entropy and energy dispersion in ecosystems.

• It quantifies the amount of energy transferred in ecosystems.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

Label the model of the carbon cycle

b

c

d

e

a

Respiration

Photosynthesis

Carbon dioxide (CO2)

Decomposition

Combustion

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

What is an ecosystem?

• Only the biotic components of an environment

• Only the abiotic components of an environment

• All the biotic and abiotic components of an environment and their interactions

• The role an organism plays in its environment

Tags

NGSS.MS-LS2-3

What is the effect of removing top predators in an ecosystem, as described in the case study of the Grey Wolf in Yellowstone National Park?

• Increase in prey population only

• No significant changes in the ecosystem

• Reciprocal changes in other populations due to interconnectedness of food webs

• Decrease in plant diversity

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-4