GCSE Biology - Food Chains & Predator Prey Cycles #85

The video explains how energy flows through ecosystems using food chains, starting with producers like plants that convert solar energy into biomass. It describes the roles of primary, secondary, and tertiary consumers and highlights energy loss at each level. The concept of predator-prey cycles is introduced, showing how populations of predators and prey fluctuate over time due to their interactions.

What is the primary role of producers in a food chain?

• To decompose organic matter

• To consume primary consumers

• To produce energy through photosynthesis

• To act as secondary consumers

Which of the following best describes the energy transfer from grass to mice in a food chain?

• All energy is transferred without loss

• Most energy is transferred with minimal loss

• Energy is transferred equally at each level

• Only a small portion of energy is transferred

In a food chain, what do the arrows between different levels represent?

• The direction of energy flow

• The size of each organism

• The speed of energy transfer

• The number of organisms at each level

What is a key characteristic of predator-prey cycles?

• Predator populations peak before prey populations

• Predator populations lag behind prey populations

• Both populations increase simultaneously

• Prey populations remain constant over time

Why do predator-prey cycles not reach a steady equilibrium?

• Environmental factors remain constant

• Population changes take time due to generational breeding

• Prey reproduce faster than predators

• Predators always outnumber prey