Chapt.9 Photosynthesis

Chapt.9 Photosynthesis - Photosynthesis BIO 2107K:...

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
BIO 2107K: BIOLOGICAL PRINCIPLES I Photosynthesis
Background image of page 1

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

View Full DocumentRight Arrow Icon
Living organisms engage in metabolic activities Photosynthesis: conversion of light energy into chemical energy
Background image of page 2
Photosynthesis Glucose O 2 Cellular Respiration CO 2 H 2 O
Background image of page 3

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

View Full DocumentRight Arrow Icon
Glucose O 2 CO 2 H 2 O + 6 + 6 12 1 Photosynthesis H 2 O + 6 Glucose O 2 CO 2 H 2 O + 6 + 6 6 1 Cellular Respiration
Background image of page 4
We are heterotrophs : we need a source of organic molecules to survive (cannot synthesize our own food) We owe our continued existence to autotrophs , organisms that make organic from inorganic molecules.
Background image of page 5

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

View Full DocumentRight Arrow Icon
Living organisms form interconnecting webs
Background image of page 6
Photoautotrophs use light as the energy source to make organic molecules in a process known as photosynthesis x Plants x Algae x Some bacteria (cyanobacteria)
Background image of page 7

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

View Full DocumentRight Arrow Icon
Photosynthesis, 19 th -century style Three principal ingredients: x Water x Carbon Dioxide x Light CO 2 + H 2 O + light energy b sugar + O 2
Background image of page 8
Strand of Spirogyra Light A glass prism breaks up a beam of light into a spectrum of colors, which are cast across a microscope slide. Bacteria Englemann’s 1882 Experiment
Background image of page 9

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

View Full DocumentRight Arrow Icon
x Light is radiant energy x Photons are discreet units of energy carried in light x Visible light ranges from wavelengths of about 400 nm (violet) to 700 nm (red) x The shorter the wavelength, the greater the energy
Background image of page 10
Wavelength
Background image of page 11

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

View Full DocumentRight Arrow Icon
Fig. 9-4b, p. 181 Radio waves Range of the electromagnetic spectrum The shortest, most energetic wavelengths The longest, lowest-energy wavelengths Most of the radiation that reaches Earth’s surface is in this range Gamma rays X-rays Ultraviolet radiation Visible light Near-infrared radiation Infrared radiation Microwaves Wavelength of visible light (nm) 400 700
Background image of page 12
Electrons in pigments absorb light energy x Pigments are molecules that can absorb wavelengths of light in the visible region x In photosynthesis, light energy is absorbed by two pigments: x Chlorophylls, Carotenoids x Certain electrons in the pigment can absorb energy from photons in light x Electron starts in the ground state ( low energy ), absorbs photon energy, and jumps to a higher energy level ( excited state )
Background image of page 13

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

View Full DocumentRight Arrow Icon
Photon Low energy level High energy level Electron at ground state Electron at excited state Either Or Or Pigment molecule Electron-accepting molecule Inductive Resonance PIGMENT MOLECULE
Background image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/06/2012 for the course BIOL 2107 taught by Professor J.louten during the Spring '10 term at SPSU.

Page1 / 59

Chapt.9 Photosynthesis - Photosynthesis BIO 2107K:...

This preview shows document pages 1 - 15. Sign up to view the full document.

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