Ecology Concepts and Nutrient Cycles

This video tutorial by Griffin covers the basics of ecology, focusing on the interactions among organisms and their environments. It explains the levels of ecological organization, energy flow from the sun through producers and consumers, and the concept of trophic levels. The tutorial also discusses ecological pyramids, including energy, biomass, and number pyramids, and the cycles of matter such as the water, carbon, nitrogen, and phosphorus cycles. Key concepts and learning objectives are summarized at the end.

What is the primary focus of ecology?

• The study of the Earth's physical structure

• The study of individual organisms

• The study of chemical reactions

• The study of interactions among organisms

Which of the following is a producer in an ecosystem?

• Earthworm

• Oak tree

• Lion

• Hawk

What type of consumer only eats plants?

• Detrivore

• Herbivore

• Omnivore

• Carnivore

In a food web, what can a top predator like a hawk eat?

• Only decomposers

• Many different consumers and sometimes producers

• Only one type of consumer

• Only producers

What does the energy pyramid illustrate?

• The number of organisms at each trophic level

• The flow of energy through trophic levels

• The total biomass at each trophic level

• The recycling of nutrients

Which cycle involves the evaporation and precipitation of water?

• Water cycle

• Nitrogen cycle

• Phosphorus cycle

• Carbon cycle

What process converts nitrogen gas into ammonia?

• Respiration

• Denitrification

• Nitrogen fixation

• Photosynthesis

Which nutrient is essential for forming RNA and DNA?

• Carbon

• Nitrogen

• Phosphorus

• Oxygen

What is primary productivity?

• The total biomass of an ecosystem

• The rate at which organic matter is produced by producers

• The number of trophic levels in a food chain

• The rate at which consumers eat producers

What is a limiting nutrient?

• A nutrient that is recycled quickly

• A nutrient that is not used by any organisms

• A nutrient that restricts the growth of organisms

• A nutrient that is abundant in the ecosystem