Ecosystem Dynamics and Interactions

The video provides a review of key ecosystem concepts, focusing on cycles of matter such as carbon, oxygen, nitrogen, and water. It explains human impacts on these cycles, the role of photosynthesis and respiration, and the importance of nitrogen fixation. The video also covers ecosystem limiting factors, both biotic and abiotic, and explores different types of symbiotic relationships, including parasitism, commensalism, and mutualism.

Which of the following is a source of carbon dioxide in the carbon cycle?

• Cellular respiration

• Nitrogen fixation

• Condensation

• Photosynthesis

What is the primary consequence of burning fossil fuels on the carbon cycle?

• Decreased oxygen levels

• Increased nitrogen levels

• Excess carbon dioxide in the atmosphere

• Reduced water vapor

Which organisms are primarily responsible for releasing oxygen into the atmosphere?

• Fungi

• Decomposers

• Animals

• Photosynthetic organisms

What is the role of nitrogen-fixing bacteria in the nitrogen cycle?

• They convert nitrogen gas into ammonia.

• They release oxygen into the atmosphere.

• They decompose organic matter.

• They cause precipitation.

Which of the following is an example of a legume?

• Rice

• Wheat

• Corn

• Soybeans

What process in the water cycle involves the transformation of water from a liquid to a gas?

• Transpiration

• Precipitation

• Evaporation

• Condensation

Which of the following is a biotic factor in an ecosystem?

• Plants

• Water

• Air

• Rocks

What type of symbiotic relationship benefits one organism while the other is unaffected?

• Commensalism

• Competition

• Mutualism

• Parasitism

Which of the following is an example of mutualism?

• A lion hunting a zebra

• A shark and a remora

• A clownfish and a sea anemone

• A tick on a dog

What is a population-independent limiting factor?

• Disease

• Weather

• Predation

• Competition