Atmospheric Effects and Ecosystem Roles

The video discusses energy flow in ecosystems, emphasizing the Sun as the primary energy source. It explains food chains, food webs, and trophic levels, highlighting energy transfer and loss. The carbon cycle and greenhouse effect are detailed, showing their roles in ecosystems and climate change. The video concludes with a preview of human influences on ecosystems.

What is the primary source of energy for all biological systems?

• The Earth

• The Moon

• The Ocean

• The Sun

Which of the following is a producer in an ecosystem?

• Songbird

• Hawk

• Caterpillar

• Mahogany tree

What is the role of decomposers in an ecosystem?

• They break down dead organic matter.

• They produce their own food using sunlight.

• They hunt other animals for food.

• They consume plants for energy.

Why is it difficult for a sixth trophic level to exist?

• Apex predators are too few.

• There is too much energy available.

• Energy is lost at each trophic level.

• Producers are too numerous.

What process do plants use to take carbon dioxide out of the air?

• Decomposition

• Photosynthesis

• Combustion

• Respiration

How is carbon dioxide released back into the atmosphere from dead organisms?

• Through photosynthesis

• Through decomposition

• Through respiration

• Through combustion

What is the greenhouse effect?

• A way to increase plant growth

• A process that cools the Earth's surface

• A natural process that warms the Earth's surface

• A method of producing energy

Which gas is primarily responsible for the enhanced greenhouse effect?

• Methane

• Carbon dioxide

• Nitrogen

• Oxygen

What happens when there is an excess of CO2 in the atmosphere?

• Global cooling occurs

• Photosynthesis increases

• Global warming occurs

• The greenhouse effect is reduced

What is the effect of cutting down trees on the atmosphere?

• Has no effect

• Increases oxygen levels

• Decreases carbon dioxide levels

• Increases carbon dioxide levels