PHOTOSYNTHESIS 6CO2 + 6H2O + SUNLIGHT C6H12O6 + 6O2 CARBON DIOXIDE WATER GLUCOSE OXYGEN REACTANTS PRODUCTS.

1 PHOTOSYNTHESIS 6CO2 + 6H2O + SUNLIGHT C6H12O6 + 6O2 CAR...
Author: Robert Shelton
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1 PHOTOSYNTHESIS 6CO2 + 6H2O + SUNLIGHT C6H12O6 + 6O2 CARBON DIOXIDE WATER GLUCOSE OXYGEN REACTANTS PRODUCTS

2 PHOTOSYNTHESIS PLANTS NEED SUNLIGHT TO SURVIVE. THE HARNESS THE ENERGY IN LIGHT TO MAKE FOOD FROM CARBON DIOXIDE AND WATER.

3 MOVING MATERIAL INSIDE PLANTS Xylem and Phloem are the vascular tissue in most plants. These tissues transport materials throughout a plant. After water enters a plant’s roots, it moves into the xylem. Water the flows inside the xylem to all parts of the plant. Without enough water plant cells wilt. Most plants make their own food- a liquid sugar. The liquid sugar moves out of food making cells, enters the phloem and flows to all plant cells. Cells breakdown the sugar and release energy. Some plant cells can store food.

4 PLANT LEAVES HAVE MANY TYPES OF CELLS

5 The cells that make up the top and bottom layers of the leaf are flat, irregular shaped cells called epidermal cells. On the bottom of most leaves are small openings called stomata. Carbon dioxide, water vapor, and oxygen pass through the stomata. Epidermal Cells can produce a waxy covering called the cuticle.

6 PLANT CELLS

7 CELLS Most photosynthesis occurs in two types of mesophylls cells inside the leaf. These cells contain chloroplasts, the organelle where photosynthesis occurs. Near the top surface of the leaf are palisade cells. With the mesophyll and palisade cells packed together exposes most of the cells to light.

8 LIGHT SPECTRUM

9 Chlorophyll does not absorb all the wavelengths of visible light equally. Chlorophyll a, the most important light-absorbing pigment in plants, does not absorb light in the green part of the spectrum. Light in this range of wavelengths is reflected. This is the reason why chlorophyll is green and also why plants (which contain a lot of chlorophyll) are also green.

10 CAPTURING LIGHT ENERGY In the first step of photosynthesis, plants capture energy in light. This occurs in the chloroplasts. Chloroplast contain plant pigments. Pigments are chemicals that can absorb and reflect light. Chlorophyll the most common plant pigment, is necessary for photosynthesis.

11 CAPTURING LIGHT ENERGY Most plants appear green because chlorophyll reflects green light. Chlorophyll absorbs other colors of light. This light energy, a form of radiant energy, is used during photosynthesis. Radiant energy is energy that travels by waves or particles, particularly electromagnetic radiation such as heat or x-rays.

12 CAPTURING LIGHT ENERGY Chlorophyll traps and stores light energy, this energy can be transferred to molecules. During photosynthesis, water molecules are split apart. This release oxygen into the atmosphere.

13 CHLOROPLAST MAKE SUGARS

14 MAKING SURGARS In the second step of photosynthesis sugars are made. This step can occur without light. In chloroplast, carbon dioxide from the air is converted into sugars by using the energy stored and tapped by chlorophyll. Carbon dioxide combines with hydrogen atoms from the splitting of water molecules and forms sugar molecules. Plants can use this energy source, or they can store it. examples: potatoes and carrots

15 VOCABULARY Photosynthesis Radiant EnergyCarbon DioxideOxygen GlucoseChloroplastChlorophyllXylem PhloemStromaPalisade cellsMesophyll cells ProductReactantLight Spectrum