Photosynthesis Respiration and Transpiration.notebook February 13, 2017

Essential Question: What processes are required for plant survival?

Key Concept: All living things need energy to carry out their basic functions. Living things break down food to get their energy.One thing that makes plants different from most others organisms is how they get their food.

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There are 3 processes that take place in the leaves that are mandatory for plant to survive. ­Photosynthesis ­Respiration ­Transpiration

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ALL PLANTS ARE AUTOTROPHS which means they make their own food for energy. Food for plants is SUGAR

Remember: Chloroplast: Attract sunlight with chlorophyll Mitochondria: Energy Factory

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Observe the diagrams below. Can you infer which one is photosynthesis and respiration?

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What is needed: 1st Photosynthesis 1. Sunlight 2. Carbon Dioxide 3. Water What it Makes: ­ Sugar (keeps) ­ Oxygen (released for humans) Where it happens: Chloroplasts

Sunlight

Water H20

Carbon Dioxide CO2 Equation:

Sunlight + 6H2O + 6CO2 = 6O2 + C6H12O6

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6 Photosynthesis Respiration and Transpiration.notebook February 13, 2017

Water Photosynthesis Sugar

Carbon Oxygen Dioxide Excess Solar Energy Water

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Photosynthesis makes sugar, but in order to use the food the plant must break it down into usable energy through a process called

Respiration. Food Respiration is the process of how plants break down the sugar so the plant can use it for energy.

Energy

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What is needed: 2nd Respiration 1. Sugar 2. Oxygen 3. Water What it Makes: ­ Energy (uses)

­ CO2 (releases) ­ Excess Water (releases) Where it happens: Mitochondria

Equation:

C6H12O6 + 6O2 = ENERGY + 6CO2 + 6H2O

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• Why does the plant need energy? > To grow > To respond to stimuli > To reproduce > TO LIVE

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Water Sugar Respiration Carbon Oxygen Dioxide Water Energy

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They are Opposites!

Photosynthesis: Solar energy + CO2 + Water = Oxygen and Sugar Respiration Oxygen + Sugar = CO2 + Water + Energy

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Some of the water taken in by the roots is used in the process of photosynthesis. However, plants lose most of the water through the leaves. This process is called Transpiration

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Transpiration: the flow of water out of the leaves into the air. • Without a way to control transpiration, plants would wither up and die. > Plants are able to slow down transpiration through Guard Cells. • Guard Cells: open and close the stomata. > When the stomata are closed, water can not escape from the leaf.

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http://studyjams.scholastic.com/studyjams/jams/science/plants/photosynthesis.htm

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Summary: Write 5­6 sentences about the 3 processes that we just learned about. Question: Create question for each section.

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1. Matching __C__ How plants sweat. A. Respiration __B__ How plants make food. B. Photosynthesis __A__ How plants use food. C. Transpiration 2. What structure in plant cells attract sunlight for photosynthesis? chloroplast 3. What prevents a plant from losing too much water. Guard Cells

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1. Which of the following statements is true? A) Plants use chlorophyll to produce carbon dioxide. B) Plants break down chlorophyll as food. C)Plants use chlorophyll to trap the energy in sunlight. D) Plants store chlorophyll as waste.

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2. Which of these are product of photosynthesis? A) oxygen and chlorophyll B) oxygen and carbon dioxide C)carbon dioxide and water D) oxygen and sugar

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3. Which of these do plants need for cellular respiration? A) carbon dioxide and water B) oxygen and sugar C) water and sugar D) water and oxygen

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4. What is the source of energy for photosynthesis? A) soil B) carbon dioxide C) oxygen D) light

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5. Which of these prevents a plant from losing too much water? A) guard cells B) chloroplasts C) chlorophyll D) stomata

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