PHOTOSYNTHESIS

GROUP 4

Light Energy and Plants

Learning Objectives• By the end of this lesson, students should be able to: -explain that the process of photosynthesis converts light

energy to chemical energy. - explain that the sun is the original energy source for most

life on earth. -identify the reactants and products of photosynthesis. -explain which reactions in photosynthesis are light

dependent which are light independent. -explain why many plants appear green to us here on

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Colors/Visible LightS8P4. Students will explore the wave nature of sound and electromagnetic radiation.

a. Identify the characteristics of electromagnetic and mechanical waves. b. Describe how the behavior of light waves is manipulated causing reflection, refraction diffraction, and absorption. c. Explain how the human eye sees objects and colors in terms of wavelengths. d. Describe how the behavior of waves is affected by medium (such as air, water, solids). e. Relate the properties of sound to everyday experiences.

Colors/Visible LightS8P4. Students will explore the wave nature of sound and electromagnetic radiation.

a. Identify the characteristics of electromagnetic and mechanical waves. b. Describe how the behavior of light waves is manipulated causing reflection, refraction diffraction, and absorption. c. Explain how the human eye sees objects and colors in terms of wavelengths. d. Describe how the behavior of waves is affected by medium (such as air, water, solids). e. Relate the properties of sound to everyday experiences.

GPS Standards

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Presenters John: Explain that the sun is the original energy source for most life

on earth and the basics components needed for photosynthesis. Share short Discovery Education video on photosynthesis.

Monique: Explain that the process of photosynthesis converts light energy to chemical energy. Share the Nova Illuminating Photosynthesis resource.

Terence: Identify the reactants and products of photosynthesis, and explain which reactions in photosynthesis are light dependent which are light independent. Share the resource Teach Engineering.

Michelle: Explain why many plants appear green to us here on earth. Share the resource Biology 4 Kids.

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What is the process of photosynthesis?• Photosynthesis converts light energy into chemical energy.• Photosynthesis provides the energy needed by most plants,

animals, and other living things.

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The Process of Photosynthesis

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The Process of Photosynthesis The process of photosynthesis converts light energy to chemical energy.

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Nova Illuminating Photosynthesis

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Light Dependent and Independent Reactions in Photosynthesis

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Light Dependent and Independent Reactions in Photosynthesis

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Different wavelengths of visible light are seen by the human eye as different colors.

WHYWHY ARE ARE PLA PLANTS NTS GREGREEN?EN?

Gammarays

X-rays UV Infrared

Micro-waves

Radiowaves

Visible light

Wavelength (nm)

Why are plants green?

Reflect

ed lig

ht

Transmitted light

Sunlight minus absorbed Sunlight minus absorbed wavelengths or colors wavelengths or colors equals the apparent color of equals the apparent color of an object.an object.

• The green color comes from chlorophyll in the chloroplasts

• Chloroplasts absorb light energy and convert it to chemical energy

LightReflected

light

Absorbedlight

Transmittedlight

Chloroplast

THE COLOR OF LIGHT SEEN IS THE COLOR NOT ABSORBED

• Photosynthesis is the process by which autotrophic organisms use light energy to make sugar and oxygen gas from carbon dioxide and water

AN OVERVIEW OF PHOTOSYNTHESIS

Carbondioxide

Water Glucose Oxygengas

PHOTOSYNTHESIS

Photosynthesis

• Occurs in chloroplasts• The green color comes from chlorophyll

in the chloroplasts• Chlorophyll is the green pigment that

captures light for photosynthesis• The pigments absorb light energy and

create sugar and oxygen

Biology 4 Kids

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Resources and References• Google Images of Photosynthesis• Nova Illuminating Photosynthesis• Teach Engineering• Biology 4 Kids

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Photosynthesis Quiz

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1. The process of photosynthesis convertsa. Nutrients into cell growthb. Cell mass into plant structurec. Light energy into chemical energyd. Plant cells into animal cells

Photosynthesis Quiz

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2. The origin of energy for most life on earth isa. Carbon, oxygen, and waterb. Natural light from the sunc. The Earth’s cored. The atom

Photosynthesis Quiz

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3. What are the reactants and products of photosynthesis?

a. Oxygen and water; carbon dioxide and sugarsb. Sugars and oxygen; water and carbon dioxidec. Carbon dioxide and water; sugar and oxygen

Photosynthesis Quiz

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4. The process of photosynthesis is divided into two main parts. What is the order of the process?

a. Light independent reaction and light dependent reactionb. Light dependent reaction and light independent reactionc. Both of the aboved. None of the above

Photosynthesis Quiz

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5. Plants appear green to the human eye due toa. Reflection of green lightb. The processing of chloroplastc. Absorption of pure lightd. The processing of chlorophyll