Thursday, Septempber 6th Bellwork: 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

Each time one organism eats another organism, energy is transferred. Animals get their energy from: Food  Two types of food 1. 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 7 th 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, also known as 2nd order heterotrophs are animals Examples include: Robins, mice Primary consumers, also known as 1 st order heterotrophs are animals Examples include: Cows, deer, caterpillars Producers, also known as autotrophs, are plants Example: Trees, grass, wheat Tertiary consumers, also known heterotrophs, are animals Examples include: Hawks, fox 80% of the available energy is used at each level 10% 10% of the energy is released as heat at each level