PLANTS NutritionPHOTOSYNTHESIS Nutrition What is Nutrition Definition Nutrition

PLANTS Nutrition-PHOTOSYNTHESIS

Nutrition What is Nutrition? Definition: Nutrition is all activities by which an organism obtains and processes food for energy, growth, repair, and regulation. What is Autotrophic Nutrition? Definition: Organisms manufacture organic compounds (ex. C 6 H 12 O 6=sugar) from inorganic compounds (ex. - CO 2). Examples of organisms that are Autotrophic= most plants, monerans, and some protists (algae).

Types of Autotrophic Nutrition What does the prefix “photo” mean? What does the word “synthesis” mean? Putting the two together, what do you think the word “photosynthesis” means? 1. PHOTOSYNTHESISDefinition: Type of Autotrophic Nutrition where light energy is converted to chemical energy. • Takes place in the Chloroplasts Why are chloroplasts green? Chloroplasts contain chlorophyll pigments which absorb red and blue wavelengths of light, and reflect green wavelengths. * SO RED AND BLUE WAVELENGTHS ARE MOST EFFECTIVE AND GREEN WAVELENTHS ARE LEAST EFFECTIVE* There are other pigments which absorb light energy and transfer it to chlorophyll: • Carotenes- reflect orange wavelengths • Xanthophylls- reflect yellow wavelengths

So, what organic compound is a product of photosynthesis? GLUCOSE CO 2 + H 2 O+ light energy-----> C 6 H 12 O 6 + O 2 + H 2 O carbon dioxide + water+ sunlight-----> glucose + oxygen + water *Photosynthesis is the source of most of the oxygen in the air!* What can glucose be used for? Results of Photosynthesis- Glucose may be used: 1. To synthesize other compounds (ex. - fats, proteins) 2. Converted to storage products by dehydration synthesis 3. Used for cellular respiration to produce energy

2. CHEMOSYNTHESIS- Using the prefix “chemo” as a guide, can anyone guess what chemosynthesis is? Chemosynthesis is: • A form of autotrophic nutrition where energy from oxidation of inorganic substances is converted to chemical energy. • It does not involve light energy. • It is carried on by only a few types of bacteria.

Compare and Contrast PHOTOSYNTHESIS • Converts light energy to chemical energy • Carried on by most plants • Occurs in chloroplasts CHEMOSYNTHESIS • Converts energy from oxidation of inorganic substances to chemical energy • Does not involve light energy • Carried on by a few types of bacteria