The photosynthesis equation Write the chemical equation for photosynthesis in words… Then write the equation again using molecular formulas… Then balance the chemical equation using coefficients… Word Bank: Sunlight Water Glucose Carbon dioxide Oxygen

Photosynthesis: Plants use the energy of sunlight to convert water and carbon dioxide into high energy sugars and oxygen

II. Chemical Equations Chemical equations have two parts…. Reactants Products - The raw materials -What are made

II. Chemical Equations Atoms are rearranged to form new products

The photosynthesis equation: The Reactants: The Products: Carbon dioxide & Water Glucose and Oxygen

III. What do plants use sugars for? Sugars meet the plants energy needs Builds complex carbohydrates (cellulose) for growth

V. How do plants capture the energy of sunlight? What is sunlight made of? “white light” is made of Different wavelengths of light

How do plant capture the energy of sunlight? Plants use light-absorbing molecules called pigments to absorb sunlight. A plants main pigment is called chlorophyll

Concept Check: What does chlorophyll do for plants? Absorb light-energy.

Which two colors do the chlorophyll molecules absorb most? 1. Blue/violet 2. Red Absorption

What color is not absorbed? 1. Green Absorption

What happens to the color not absorbed by the plant?

Green light is reflected back to your eyes

ANTHOCYANIN CAROTENOIDS CHLOROPHYLL A CHLOROPHYLL B XANTHOPHYLL

VII. Where does light-absorption occur? Plant Plant Cells Chloroplast

VII. Chloroplast Structure Chloroplasts have a double-membrane Chlorophyll pigments are found in chloroplasts

A Musical Summary http://www.youtube.com/watch?v=C1_uez5WX1o

Limiting Factors Brainstorm as many factors as you can that limits how many touchdowns a quarter back can throw:

Limiting Factors A limiting factor limits how fast a reaction can happen In photosynthesis, a limiting factor would limit how fast products are made -glucose and oxygen

Limiting Factors of Photosynthesis Water -Water is necessary for photosynthesis -Less water can slow or stop photosynthesis

Limiting Factors of Photosynthesis Water -What happens to grass during a drought? -How do desert plants attempt to reduce water loss?

Limiting Factors of Photosynthesis 2. Temperature -Photosynthesis works best between 0-35 degrees Celsius -Temperatures too high or low can slow or stop photosynthesis

Limiting Factors of Photosynthesis 3. Intensity of Light -High light intensity increases rate of photosynthesis -Low light intensity decreases rate of photosynthesis

Limiting Factors of Photosynthesis 3. Intensity of Light When (in the year) is the sunlight most intense in Missouri? When do the plants have the highest rate of photosynthesis?

Limiting Factors Summary The following factors can limit the rate of photosynthesis: 1. Water 2. Temperature 3. Light intensity