Ecology Basics: Key Concepts and Terminology

This video lecture provides an overview of ecology, focusing on the interactions between ecosystems and organisms. It covers the components of ecosystems, including biotic and abiotic factors, and explains the roles of keystone and dominant species. The lecture discusses the conservation of energy and matter, the importance of photosynthesis, and the flow of energy in ecosystems. It also explores plant productivity and the roles of different consumers in the ecosystem.

What does ecology study?

• The genetic makeup of organisms

• The interactions between organisms and their ecosystems

• The structure of individual cells

• The behavior of individual organisms

What are biotic factors?

• Physical structures built by organisms

• Non-living elements in an ecosystem

• Living components of an ecosystem

• Chemical substances necessary for life

What role do keystone species play in an ecosystem?

• They have no predators

• They are the most abundant species

• They modify the ecosystem significantly

• They are the primary producers

What is the primary source of energy for Earth's ecosystems?

• Radioactivity

• Sunlight

• The Earth's core

• Geothermal vents

Which organisms are capable of photosynthesis?

• All eukaryotic organisms

• Fungi and bacteria

• All animals

• Cyanobacteria, algae, and plants

What limits the productivity of an ecosystem?

• The total biomass of producers

• The speed of herbivores

• The number of carnivores

• The amount of sunlight captured by plants

What is gross primary productivity?

• The total energy consumed by herbivores

• The amount of light energy converted to chemical energy by producers

• The total mass of consumers in an ecosystem

• The efficiency of energy transfer from producers to consumers

What is the term for organisms that cannot produce their own food?

• Heterotrophs

• Autotrophs

• Producers

• Chemoautotrophs

What is the feed conversion ratio?

• The speed at which energy is transferred in the food web

• The amount of food produced by autotrophs

• The efficiency of converting food into energy

• The rate of photosynthesis in plants

How does energy transfer efficiency impact the food chain?

• It stabilizes ecosystem dynamics

• It enhances the productivity of autotrophs

• It limits the number of trophic levels

• It increases the biomass of top predators