Lecture Notes 4-25

Lecture Notes 4-25 - FINAL= ch 17, 39, 40, 41, 42 No office...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
FINAL= ch 17, 39, 40, 41, 42 No office hours after May 2 nd BIOL- Fri, Apr 25 CH 41 How Do Ecosystems Work? p841-859 What are the pathways of energy and nutrients? Energy flows. Nutrients cycle. -energy flows: in from sunlight, out as heat -nutrients cycle: not lost as they change from one form to another (p843) Plants weigh more after they grow. Which of the following increases plant weight? 1. oxygen 2. Carbon dioxide 3. Minerals from soil 4.All of the above How does energy flow through communities? -ultimate energy source: sun -primary producers convert sunlight into chemical energy -energy passes through the ecosystem as one organism eats another -most of the sun’s energy is lost as heat Modes of Nutrition -autotrophs -producers -primary and secondary consumers -decomposers Trophic Levels -all organisms at a trophic level are the same distance from the energy input -autotrophs are closest to energy input -figure on p834-844 Food Chain -a sequence of who eats whom -simple food chains are rare in nature Food Web
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

Lecture Notes 4-25 - FINAL= ch 17, 39, 40, 41, 42 No office...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online