3.1 Energy Flow in Ecosystem

Mrs. Trimble

Mrs. Perryman

Photosynthesis

• Life depends on the sun

• Requires: Carbon dioxide and water

• Produces: glucose, oxygen and releases some water

Cellular Respiration

• The process of cells breaking down food to yield energy

• Requires: Glucose and oxygen

• Produces: Energy,Carbon dioxide and water.

They need each other

Feeding Relationships

• Producers (Autotrophs)- Plants

• Consumers (Heterotrophs)- organisms that get their food by consuming other organisms

Types of Consumers

• Herbivore- eats plants• Carnivore- eats

animals• Omnivore- eats both

plants and animals• Decomposer- breaks

down dead organisms in an ecosystem, returning them to nature

Energy Transfer

• Food Chain- sequence in which energy is transferred from one organism to the next

Energy Transfer

• Food Web- shows many feeding relationships

Biomass Pyramid

• Trophic Level- each step in the energy trophic level

Producers

Primary Consumers/ Herbivore

Secondary Consumer/ Consumers

Energy Loss within an ecosystem

• 90% of the energy at each level is due to normal daily activity.

• Only 10% of the biomass is passed onto the next level.

10,000 g/m2

1,000g/m2

100 g/m2

Now Let’s Practice!