Front

If a cactus contains 10,000 units of energy, how much energy is available to the red-tailed hawk?

Back

10 units of energy. This illustrates the concept of energy transfer in an ecosystem, where only about 10% of energy is passed to the next trophic level.

Front

What type of soil is composed of 20% clay, 60% silt, and 20% sand?

Back

Silt loam. This classification is important for understanding soil properties and their impact on agriculture and ecology.

Front

What is a major drawback of replacing ozone-depleting CFCs with HFCs?

Back

HFCs are a greenhouse gas. This highlights the trade-offs in environmental policy and the need for sustainable alternatives.

Front

Which of the following is NOT a way to reduce air pollutants?

Back

Using regular unleaded fuel. This emphasizes the importance of advanced technologies and practices in pollution reduction.

Front

What is an example of a non-point source of pollution?

Back

Urban runoff. This concept is crucial for understanding how pollution can enter water systems from diffuse sources.

Front

Define 'trophic level'.

Back

A trophic level is a position in a food chain or food web, representing the flow of energy and nutrients.

Front

What is the greenhouse effect?

Back

The greenhouse effect is the warming of Earth’s surface due to the trapping of heat by greenhouse gases in the atmosphere.

Front

Explain the term 'biodiversity'.

Back

Biodiversity refers to the variety of life in a particular habitat or ecosystem, including species diversity, genetic diversity, and ecosystem diversity.

Front

What is the significance of the ozone layer?

Back

The ozone layer protects Earth from harmful ultraviolet (UV) radiation from the sun, which can cause skin cancer and other health issues.

Front

What are CFCs and why are they harmful?

Back

Chlorofluorocarbons (CFCs) are chemicals used in refrigeration and aerosol propellants that deplete the ozone layer.