Food Chain and Ecosystem Dynamics

The video tutorial explains how food chains represent feeding relationships within a community. It covers the roles of producers, primary, secondary, and tertiary consumers, and how energy flows through these chains. The video also discusses predator-prey dynamics, illustrating how their populations rise and fall in cycles within a stable community. It highlights the impact of environmental changes on these cycles and emphasizes the importance of balance in biotic and abiotic factors.

What is the primary purpose of a food chain?

• To show the energy flow in an ecosystem

• To represent feeding relationships within a community

• To identify the most important species in an ecosystem

• To measure the population of different species

What is a producer in a food chain?

• An organism that is at the top of the food chain

• An organism that synthesizes complex molecules

• An organism that eats other organisms

• An organism that decomposes organic material

Which of the following is an example of a primary consumer?

• Fox

• Bird of prey

• Grass

• Rabbit

What is the role of a secondary consumer in a food chain?

• To decompose organic material

• To eat primary consumers

• To be eaten by tertiary consumers

• To produce energy through photosynthesis

In a food chain, what is a tertiary consumer?

• An organism that produces energy

• An organism that is a primary consumer

• An organism that eats secondary consumers

• An organism that is decomposed

What is a predator in a food chain?

• An organism that synthesizes complex molecules

• An organism that kills and eats other animals

• An organism that decomposes organic material

• An organism that is eaten by others

What happens to the population of prey when the number of predators increases?

• The prey population increases

• The prey population becomes extinct

• The prey population decreases

• The prey population remains the same

In a stable community, how do predator and prey populations change over time?

• They remain constant

• They both decrease continuously

• They rise and fall in cycles

• They both increase continuously

What could disrupt the predator-prey cycles in a community?

• A stable climate

• Introduction of a new predator

• Balanced biotic factors

• Consistent food supply

What is a stable community in ecological terms?

• A community with no predators

• A community where biotic and abiotic factors are in balance

• A community with only producers

• A community with constant population sizes