Photosynthesis
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Transcript of Photosynthesis
![Page 1: Photosynthesis](https://reader035.fdocuments.us/reader035/viewer/2022081602/5551380eb4c905bd1c8b45ab/html5/thumbnails/1.jpg)
Photosynthesis
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Objective 1• To trace the primary food source in
a food chain to the green plant
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The Primary Food Source
• Green plants always found at the beginning of the food chain.
• Why?
• The only organisms that can produce their own food
• They are called producers
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Objective 2• To define photosynthesis
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PHOTOSYNTHESIS
• Photo = light• Synthesis = building up
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DEFINITION
PhotosynthesisProcess by which plants use water & carbon dioxide to make carbohydrates in the
presence of light and chlorophyll.
Oxygen is given off during the process.
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Objective 3• To understand the conditions
necessary for plants to make their own food
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INTRODUCTION
Yummy!!!What are the similarities
between baking a cake and photosynthesis?
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REQUIREMENTS
• Raw materials– Carbon dioxide– Water
• Conditions– Chlorophyll– Light energy
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Answers• Review 1
1. An organism that make its own food, e.g. green plant
2. They make their own food by photosynthesis
• Review 21. Textbook pg 19
• Review 3– Raw materials: water & carbon dioxide– Conditions: sunlight & chlorophyll– End products: oxygen & glucose
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Objective 4• To outline the process of
photosynthesis by which plants manufacture carbohydrates using raw materials
• To state that food is stored as starch in the plant
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CARBON DIOXIDE
• From air• Enters leaf by diffusion• Pores: Stomata/Stoma• Found underside of the leaf
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Carbon dioxide
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WATER
• From soil• Absorb by root hair• Enter by osmosis• Transport by xylem vessel
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Soil
Water
Water
Root Hair
To Xylem Vessel
Water
Water
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CHLOROPHYLL
• Structure: Chloroplast• Green pigment: Chlorophyll• Absorb light energy
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Leaf
Plant Cell
Chloroplast
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LIGHT ENERGY
• Chlorophyll absorbs light energy from sun
• Light energy converted into chemical energy
• Chemical energy is needed to convert carbon dioxide to carbohydrate
• Series of chemical reactions
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Xylem
H2O
CO2
H2O
H2O
CO2
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Carbon Dioxide +Water
Light
ChlorophyllGlucose + Oxygen
O2
O2
Surroundings
STARCH
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WORD EQUATION
CARBON DIOXIDE + WATER
GLUCOSE + OXYGEN LIGHT ENERGY CHLOROPHYLL
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Review 4
1. Water, carbon dioxide, sunlight2. Chlorophyll3. It absorb the sunlight/light energy4. Chloroplasts5. The root hair absorb the water by osmosis6. Xylem vessel7. It enters through the stomata by diffusion8. Carbon dioxide + water glucose +
oxygen
Light energy
Chlorophyll
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Objective 5• To state the conditions that affect
the rate of photosynthesis
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LIMITING FACTORS
• Rate of photosynthesis is affected by:– carbon dioxide, – light intensity and – temperature
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LIGHT INTENSITY
• Higher light intensity, faster the rate of photosynthesis
• After awhile, the rate will remain constant
• Due to limiting factors such carbon dioxide concentration or temperature
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CARBON DIOXIDE
• Carbon dioxide in the air is 0.03%• Increasing the carbon dioxide
concentration to 0.1% increases the rate of photosynthesis
• After awhile the rate will remain constant due to limiting factor such as temperature and light intensity
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TEMPERATURE
• Temperatures below 40°C, as it rises, the rate of photosynthesis is faster
• At 40°C, photosynthesis begins to decrease
• As temperature rises above 40°C, photosynthesis stop as the enzymes denatured
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Other important things that plant need to grow
• Minerals– Found in soil and fertilizers– Magnesium: chlorophyll formation– Nitrogen: for making proteins
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Objective 6• To compare the conditions for
healthy growth of ornamental plants and large scale crop productions
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Ornamental Plants
• Use for decoration
• Usually grown in greenhouses
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Ornamental Plants• Conditions needed
– Types of soil – sand, organic matter– Minerals – artificial or natural fertilizers– Humidity - humid conditions better, by
spraying and misting– Temperature - warm– Light - bright– Carbon dioxide – burning fuels– Water – watering plants– Pests – hand pick/pesticides
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Large scale crops
• Includes rice, wheat, vegetables
• Relies on farming methods and agricultural technology
• Plant in open field
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Large scale crops
• Light, humidity, temperature and water – cannot be controlled
• Fertilizers – mostly used artificial fertilizers, machines
• Pests – planes to spray pesticides over farm areas
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Experiment Question
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Experiment: Testing for starch in green leaves
• What does hot water do to the leaf?– Kills the leaf to stop photosynthesis
• What does the alcohol do to the leaf?– Breaks down chlorophyll – take the green colour
out of the leaf
• What is the original colour of iodine?– brown
• What does it mean when iodine turn blue-black?– Starch is present