Thursday, Septempber 6thBellwork:

1. Get your supply bins out of the drawers.

2. Open your workbook to page 21 read this page and answer the questions.

Life Science

Energy Transfer

Energy Transfer

Each time one organism eats another organism, energy is transferred.

Animals get their energy from: Food

Two types of food1. Plants

2. Animals

Plants get their energy from: Sunlight

Food Chains are sequences in which energy is

transferred from organism to organism as one

eats another. They are single line, chain-of-events The arrow’s direction points in the

direction that energy is being transferred. The problem with food chains is they

don’t show the relationships

between interdependent organisms.

Food Webs are the feeding relationships

among all organisms in an ecosystem Made up of many food chains. Shows how all organisms in an ecosystem

are connected.

Each time energy is transferred some energy is lost as heat.

Not all of the energy is transferred to the next organism

The bottom level, the producers, have the largest population and the most amount of energy.

The highest level has the smallest population because energy available to them is limited.

Energy pyramids are often used to show how

energy is transferred from one trophic level to the next.

As the pyramid narrows at the top, the amount of energy becomes less.

There are fewer organisms at the top.

Example: Zebras and other herbivores

out-number lions 1,000 to 1 Ecosystems rarely have more than 3-4

trophic levels because of the significant loss of energy

Food Chain

Killer Whale

Seal

Salmon

Plankton

FRIDAY!!! September 7th

Bellwork:

1. Grab your supply bins.

2. Complete the Food Web Questions Worksheet using page 25 in your workbooks.

Food Web

Energy Pyramid

Secondary consumers, alsoknown as 2nd order heterotrophs

are animalsExamples include: Robins, mice

Primary consumers, alsoknown as 1st order heterotrophs

are animalsExamples include: Cows, deer, caterpillars

Producers, also known as autotrophs, are plants

Example: Trees, grass, wheat

Tertiary consumers, alsoknown heterotrophs, are animalsExamples include: Hawks, fox

80% of the available energy is used at each level

10%

10%

10%

10%

10% of theenergy is released as heat at each level