Food Chains and Food Webs: Interactions and Ecosystem Productivity

The lesson covers food chains and food webs, explaining their roles in ecosystems. It discusses energy flow, trophic levels, and the importance of diverse food sources. Examples like koalas illustrate energy loss and ecosystem risks. The complexity of food chains and the role of photosynthesis in energy cycles are highlighted, emphasizing the interconnectedness of living and non-living environments.

What is the primary focus of the lesson on food chains and food webs?

• To study the migration patterns of herbivores

• To learn about the diet of koalas

• To explore the impact of food chains on ecosystems at risk

• To understand the role of decomposers

How is ecosystem productivity expressed?

• Through the migration of herbivores

• By the amount of biomes and energy flows

• Through the number of carnivores

• By the diversity of plant species

What is a food web?

• A series of organisms each depending on the next as a source of food

• A network of feeding relationships among species

• A diagram showing energy loss

• A list of endangered species

Why are koalas often perceived as lazy?

• They have a slow metabolism

• They are nocturnal animals

• They consume low-energy eucalyptus leaves

• They sleep during the day

What happens to energy as it moves up trophic levels?

• It increases

• It remains constant

• It decreases

• It doubles

What is the role of decomposers in a food chain?

• To increase energy levels

• To consume primary consumers

• To recycle nutrients back to producers

• To produce energy

What process is the building block of energy in a food chain?

• Photosynthesis

• Respiration

• Decomposition

• Fermentation

Which spheres are involved in photosynthesis?

• Stratosphere, troposphere, mesosphere

• Atmosphere, hydrosphere, biosphere, lithosphere

• Geosphere, cryosphere, magnetosphere

• Asthenosphere, lithosphere, hydrosphere

What is the primary source of energy for ecosystems?

• The moon

• Volcanic activity

• The sun

• Ocean currents

In a food chain, which group is typically the most numerous?

• Decomposers

• Primary producers

• Tertiary consumers

• Secondary consumers