Ecology Final Exam Review Challenge

The video provides a comprehensive review of ecology, covering levels of organization from individual organisms to the biosphere. It explains energy flow through food chains and webs, community interactions like symbiosis, and biogeochemical cycles such as water, carbon, phosphorus, and nitrogen. The concept of ecological succession is discussed, illustrating the transformation from bare rock to a climax community. Finally, the Earth's spheres—geosphere, atmosphere, hydrosphere, and biosphere—are explored, highlighting their roles in supporting life.

What is the role of keystone species in an ecosystem?

• They are the only predators in the ecosystem.

• They help maintain the ecosystem's balance.

• They decompose organic material.

• They are primary consumers.

Which type of organism produces its own energy through photosynthesis?

• Detritivores

• Autotrophs

• Decomposers

• Carnivores

What percentage of energy is transferred from one trophic level to the next in an ecosystem?

• 75%

• 50%

• 25%

• 10%

What is the primary role of decomposers in an ecosystem?

• To consume living plants

• To produce energy through photosynthesis

• To break down dead organic material

• To predate on smaller animals

What is an example of a mutualistic relationship in nature?

• A tree overshadowing smaller plants

• A vulture feeding on a carcass

• A tapeworm living in a pig's intestines

• Hummingbirds and flowers

During which process in the water cycle does water change from a gas to a liquid?

• Precipitation

• Transpiration

• Condensation

• Evaporation

Which process in the nitrogen cycle converts ammonium into nitrates?

• Ammonification

• Denitrification

• Nitrification

• Nitrogen fixation

Which cycle involves the transformation of nitrogen in the atmosphere to compounds usable by living organisms?

• Nitrogen cycle

• Phosphorus cycle

• Water cycle

• Carbon cycle

What is the initial stage of ecological succession?

• Colonization by pioneer species

• Development of mature forest

• Formation of topsoil

• Climax community

Which sphere of the Earth includes all the water on the planet's surface?

• Hydrosphere

• Biosphere

• Atmosphere

• Geosphere