Ecosystem Dynamics and Energy Flow

The video tutorial covers Earth's four spheres: lithosphere, hydrosphere, biosphere, and atmosphere. It explains the biosphere as the sum of all ecosystems, including all living organisms. The flow of energy in ecosystems is cyclic, with only 10% of energy passed to the next level. Primary producers use solar energy for photosynthesis, herbivores feed on plants, and carnivores prey on herbivores. Decomposers break down waste, returning nutrients to the soil.

Which sphere of Earth is primarily composed of solid rock?

• Atmosphere

• Biosphere

• Lithosphere

• Hydrosphere

What does the biosphere encompass?

• All living organisms

• Only plants and animals

• Only microorganisms

• Only aquatic life

Who introduced the term 'biosphere'?

• Charles Darwin

• Albert Einstein

• Isaac Newton

• Edward Source

What is the primary source of energy for primary producers in an ecosystem?

• Geothermal energy

• Solar energy

• Wind energy

• Hydroelectric energy

Which organisms are considered primary producers?

• Herbivores

• Decomposers

• Carnivores

• Plants, algae, and bacteria

What role do decomposers play in an ecosystem?

• They produce energy

• They are at the top of the food chain

• They consume primary producers

• They break down waste and return nutrients to the soil

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

• 90%

• 10%

• 25%

• 50%

Which of the following is NOT a sphere of Earth?

• Astrosphere

• Atmosphere

• Hydrosphere

• Lithosphere

In what manner does energy flow in ecosystems?

• In a linear manner

• In a cyclic manner

• In a random manner

• In a static manner