Ecosystem Stability Insights

The video covers ecosystem stability and climate change, focusing on factors that make ecosystems stable or unstable. It recaps the carbon and nitrogen cycles, explaining the role of photosynthesis and cellular respiration. The video discusses stable ecosystems characterized by high biodiversity and low toxins, and unstable ones with low biodiversity and high disease. It highlights negative impacts like deforestation and positive impacts like succession. The teacher emphasizes the importance of reviewing materials for the upcoming test.

Why are excess CO2 emissions harmful to the environment?

• They increase oxygen levels.

• They promote plant growth.

• They trap heat on Earth.

• They reduce nitrogen levels.

Tags

NGSS.MS-ESS3-5

What role do nitrogen-fixing bacteria play in the nitrogen cycle?

• They release nitrogen into the air.

• They produce oxygen for animals.

• They convert nitrogen into ammonia for plants.

• They decompose dead organisms.

What is a key characteristic of a stable ecosystem?

• High biodiversity

• High levels of toxins

• Frequent species migration

• Low biodiversity

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-5

Which of the following is NOT a factor that contributes to an unstable ecosystem?

• Organisms migrating or leaving

• High biodiversity

• Low energy availability

• High levels of disease

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

NGSS.MS-LS2-5

How does deforestation destabilize ecosystems?

• By decreasing CO2 levels

• By promoting plant growth

• By reducing the number of photosynthesizers

• By increasing oxygen levels

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

What is an algal bloom and what causes it?

• A decrease in algae due to overfishing

• A growth of algae due to excess sunlight

• A growth of algae due to fertilizer runoff

• A decrease in algae due to pollution

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Why are warming oceans and melting ice caps problematic?

• They increase phytoplankton populations.

• They decrease phytoplankton populations.

• They reduce CO2 levels.

• They promote photosynthesis.

Tags

NGSS.MS-ESS3-5

What is primary succession?

• Rebuilding of an ecosystem with soil present

• Rebuilding of an ecosystem after a fire

• Rebuilding of an ecosystem from bare rock

• Rebuilding of an ecosystem after a flood

What is secondary succession?

• Rebuilding of an ecosystem after a volcanic eruption

• Rebuilding of an ecosystem from bare rock

• Rebuilding of an ecosystem after a landslide

• Rebuilding of an ecosystem with soil present

What should students do to prepare for the upcoming test?

• Ignore the videos and notes

• Only ask the teacher for help

• Rely solely on classroom discussions

• Review the videos and notes, and take their own notes