BT101 Slides Complete

What is Ecosystem?

Control of Ecosystem · • External · Climate, topography · • Internal

Types of species, population size, disease, gene pool, reproduction rate

External factors are independent of internal factors.

What is Ecosystem?

Biome

• Distinct biological communities

• Formed in response to specific external factors in that environment

Principles

Energy is neither created nor destroyed in the biosphere.

Organisms cannot convert heat to any of the other forms of energy.

• They only convert some chemical-bond or light energy to heat.

• Earth is an open system having constant and equal exposure to light.

• Plants use light energy in

• They convert light energy into chemical bond energy.

• Animals use chemical bond energy to make organic molecules.

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Light and chemical-bond energy are partially converted to heat at every step.

• Heat is radiated into outer space at invisible infrared wavelengths.

• Earth’s incoming and outgoing flows of radiant energy must be equal for global temperature to stay constant.

Producers · • Concept of producers · • Types of producers · • Chemosynthesis