Ecosystem Dynamics and Energy Flow

Miss Sarah teaches primary five students about ecosystems, focusing on Palawa Island's conservation efforts. She explains how land activities affect marine environments and discusses the impact of changes in ecosystems, such as rain in deserts. The lesson covers marine and desert food webs, emphasizing energy transfer and the role of consumers. The video concludes with a summary of key points.

What is the primary goal of conservation programs on Palau Island?

• To expand fishing activities

• To build more resorts

• To protect marine environments

• To increase tourism

How do people on Palau Island prevent marine pollution?

• By importing more waste

• By increasing fishing quotas

• By building more factories

• By controlling human activities on land

What happens to a food web when a key organism is removed?

• It becomes more diverse

• It may collapse

• It remains unchanged

• It becomes more stable

What effect does gentle rain have on a desert ecosystem?

• It harms the ecosystem

• It has no effect

• It improves the ecosystem

• It causes flooding

What is the impact of heavy rain on a desert ecosystem?

• It improves plant growth

• It causes drought

• It leads to flooding

• It has no impact

What role do algae play in marine food webs?

• They are top predators

• They are primary consumers

• They are producers

• They are decomposers

How much energy is transferred between organisms in a food web?

• 90%

• 10%

• 25%

• 50%

What happens to the energy not transferred between organisms?

• It is used by top predators

• It is lost forever

• It is stored in the atmosphere

• It is returned to the soil by decomposers

What would happen to rabbits if all the grass in a desert food web were removed?

• They would thrive

• They would migrate or die

• They would become predators

• They would find new food sources easily

What is the consequence of having too many top predators in a food web?

• No significant impact

• Harm to other organisms

• Stability in the ecosystem

• Increased biodiversity