photosynthesis and the leaf. energy a.the sun is the source of energy for almost all life on earth...
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Photosynthesis and the Leaf
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EnergyA. The sun is the source of energy
for almost all life on Earth
B. The sun’s energy is transferred into a useable form through photosynthesis
C. Photosynthesis uses energy from the sun to convert water and carbon dioxide into high-energy sugar and oxygen
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Photosynthesis & Respiration
• 3 Kinds of Respiration– 1) external respiration- breathing, exchange of
gases between atmosphere and lungs– 2) internal respiration – exchange of O2
between blood and body cells– 3) cellular respiration – chemical reaction
where O2 molecules and broken down food molecules react to produce ATP in the mitochondria
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Formula for RespirationC6H12O6+ 6O2 6H2O + 6CO2 + energy
Glucose + oxygen = water + carbon dioxide + ATP
• This is the process by which glucose molecules are broken down to release energy (ATP)
• Occurs inside the mitochondria of cells
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The Respiration/Photosynthesis Cycle
Produced by Respiration Used in Photosynthesis
CO2 + energy
Glucose + O2
Used in Respiration Produced by Photosynthesis
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PhotosynthesisWhat kind of organisms carry out photosynthesis?
A. They have pigments = light absorbing molecules
B. Plants and other green organisms have specialized organelles that help with this process. This organelle is called chloroplast
C. Photosynthesis takes place inside the chloroplast within leaf cells
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Formula for PhotosynthesisWhat goes in? What goes out?
Start with the equation:6CO2 + 6H2O C6H12O6+ 6O2
Carbon dioxide + water = glucose + oxygen
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Light-dependent Reactions
• These reactions require light
• Take place in the thylakoid membranes
• Produces ATP, NADPH (electron carrier), and oxygen
Calvin cycle
• The second cycle of photosynthesis
• Products from light-dependent reactions are synthesized into high energy glucose
• These reactions are also known as the light-independent reactions, because they do not require light
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Leaf Structure
A. Epidermis • the top and
bottom layers of the leaf
• Protects the inner tissue from injury or drying out
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Leaves
B. Cuticle• waxy covering on the leaves secreted by the
epidermis cells, prevents water from escaping
• Important because plants need water for photosynthesis
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Leaves
C. Stomata (pl. stoma)• Pores scattered through the leaf epidermis
• Carbon dioxide enters through stoma and Oxygen is released through stoma
• Water vapor can also pass in and out of the stoma (dew)
• Stoma are generally open at night and closed during the day. Typically on underside of leaf
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Leaves
D. Guard Cells• Crescent shaped cells which guard the stoma
• Responsible for opening and closing the stoma
• Guard cells pull stoma open when they become turgid (full of water)
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Leaves
E. Mesophyll• Layers of cells inside the epidermis
• Most photosynthesis takes place inside this part of the leaf where the cells contain chloroplasts.
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Leaves
F. Leaf veins• Vascular tissue in the leaves that contain xylem
and phloem
• Evaporation from the leaves (transpiration) produces the suction that pulls water up the xylem delivering nutrients to other parts of the plant.
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http://www.youtube.com/watch?v=mYbMPwmwx88&feature=rel
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