Ecosystem Dynamics and Interactions

The video tutorial covers ecological concepts such as niches, competition, and resource partitioning. It explains symbiotic relationships, including parasitism, mutualism, and commensalism. The role of keystone species, like sea otters, is discussed, highlighting their impact on ecosystems. The tutorial also delves into energy flow and nutrient cycling, emphasizing the inefficiency of energy transfer across trophic levels and the recycling of nutrients.

What is a niche in ecological terms?

• A type of competition

• A type of habitat

• A food source

• The unique living arrangement of a species

What happens when niches overlap?

• New habitats are formed

• Species become extinct

• Competition occurs

• Species evolve into new forms

Which of the following is a symbiotic relationship where both species benefit?

• Parasitism

• Mutualism

• Commensalism

• Predation

In a parasitic relationship, what happens to the host?

• It benefits

• It becomes a predator

• It remains unaffected

• It is harmed

What role do keystone species play in an ecosystem?

• They are the primary producers

• They have a disproportionately large effect

• They are the most numerous species

• They have a minimal impact

What is the primary source of energy for nearly all ecosystems on Earth?

• The moon

• Ocean currents

• The sun

• Volcanic activity

What process do producers use to convert sunlight into chemical energy?

• Respiration

• Photosynthesis

• Decomposition

• Fermentation

What is the term for organisms that feed on dead organic matter?

• Producers

• Primary consumers

• Detritus feeders

• Tertiary consumers

How much energy is typically transferred from one trophic level to the next?

• 10%

• 25%

• 50%

• 90%

Which organisms are responsible for breaking down organic matter into inorganic forms?

• Herbivores

• Carnivores

• Decomposers

• Omnivores