Photosynthesis An introduction. Photosynthesis Class Brainstorm.
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Transcript of Photosynthesis An introduction. Photosynthesis Class Brainstorm.
Photosynthesis
An introduction
Photosynthesis
Class Brainstorm
The 5 Ws of Photosynthesis Who?
Photoautotrophs What?
Use light energy and CO2 to make sugars Where?
Chloroplasts When?
Need light Why?
Source of energy for other organisms
Chlorophyll Definition: A green colored pigment that
absorbs light
Two types: Chlorophyll a (blue-green) and Chlorophyll b (yellow-green)
Consists of a porphyrin ring and a long hydrocarbon tail
See page 139 for image
Porphyrin ring: a Mg atom at the centre and a hydrocarbon ring of alternating single and double bonds Chlorophyll a has a methyl group (-CH3) Chlorophyll b has an aldehyde group (-COH)
Hydrocarbon tail or Phytol tail: anchors molecule to a membrane
Eukaryotic Autotrophs Algae, Photosynthetic Protists, and Plants
Chlorophyll in organelles: chloroplasts
Chloroplasts found in leaves (gives them green color)
Leaf Structure
Waxy cuticleUpper EpidermisPalisade
Mesophyll
Lower Epidermis
MesophyllSpongy Mesophyll
Vascular Bundle
Guard Cells
Chloroplast: Photosynthetic “Factories”
Sketch and label a chloroplast Inner and outer membrane Stroma – protein-rich semi-liquid Thylakoids – membrane bound sacs
contain chlorophyll and ETC Grana – stacks of thylakoids Lamellae – unstacked thylakoids that
connect grana
See page 144
Photosynthesis Overview Step 1. Capture light
energy.
Step 2. Make ATP and reduced NADP+
Step 3. Make glucose and organic compounds.
Light Electromagnetic radiation (EM): light is
a form of energy Visible light 380 (violet) -750 (red) nm Travels in wave packets called photons
Absorption Spectrum: the wavelengths of light that a pigment will absorb
Action Spectrum: the most effective wavelength for photosynthesis
See page 152
Read “A Brief History of Photosynthesis Research” on page 149-150. What experiment did J.B. Van Helmont
conduct? What did he conclude? What experiment did Joseph Priestly
conduct? What did he conclude? What is the source of O2 in
photosynthesis?
Hmwk Prelab for Fermentation Lab Study for Quiz Hmwk (take-up on Tues)
Qs: p145 #5b, 7, 9 Qs: p154 #1, 3, 6, 7, 8