Unit 10 Pre-Assessment

What is the primary source of energy for most ecosystems?

• The Moon

• The Sun

• The Ocean

• The Wind

Tags

TEKS.SCI.8.12A

Which of the following is an example of a natural disaster that can disrupt an ecosystem?

• Deforestation

• Earthquake

• Urbanization

• Agriculture

Tags

TEKS.SCI.8.12A

How does biodiversity contribute to the stability of an ecosystem?

• By reducing the number of species

• By increasing the variety of species

• By eliminating predators

• By promoting monocultures

Tags

TEKS.SCI.8.12C

Which process describes the gradual change in species composition in an ecosystem over time?

• Photosynthesis

• Ecological succession

• Erosion

• Transpiration

Tags

TEKS.SCI.8.12B

Explain how a decrease in a predator population might affect the energy transfer in a food web.

• It would increase the energy transfer to producers.

• It would decrease the energy transfer to herbivores.

• It would increase the energy transfer to herbivores.

• It would have no effect on energy transfer.

Tags

TEKS.SCI.8.12A

Describe the role of primary succession in an ecosystem after a volcanic eruption.

• It immediately restores the original ecosystem.

• It begins with the colonization of pioneer species.

• It results in the extinction of all species.

• It prevents any new species from entering the area.

Tags

TEKS.SCI.8.12B

How might human intervention, such as pollution, impact the stability of an ecosystem?

• It always increases biodiversity.

• It can lead to a decrease in biodiversity.

• It has no impact on ecosystems.

• It always stabilizes ecosystems.

Tags

TEKS.SCI.8.12A

Analyze how secondary succession might occur after a forest fire.

• The area remains barren indefinitely.

• New species colonize the area immediately.

• The soil remains intact, allowing for regrowth.

• All plant life is permanently destroyed.

Tags

TEKS.SCI.8.12B

Evaluate the impact of a decrease in biodiversity on the health of organisms within an ecosystem.

• It generally improves the health of all organisms.

• It can lead to increased vulnerability to diseases.

• It has no effect on organism health.

• It always results in stronger organisms.

Tags

TEKS.SCI.8.12C

Predict the long-term effects of human intervention, such as deforestation, on energy transfer in a food web.

• It will increase energy transfer efficiency.

• It will disrupt energy transfer and reduce biodiversity.

• It will have no long-term effects.

• It will stabilize the food web.

Tags

TEKS.SCI.8.12A