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Biology Chapter 8 Section 2 Photosynthesis Overview

Miller Levine Dragonfly Book
by

Mark Meredith

on 3 November 2012

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Transcript of Biology Chapter 8 Section 2 Photosynthesis Overview

The Photosynthesis Equation Chlorophyll does not absorb light within the green region of the spectrum.
The equation for photosynthesis is:


6CO2 + 6H2O C6H12O6 + 6O2

carbon dioxide + water sugars + oxygen Photosynthesis Overview END OF SECTION Plants use the sugars produced in photosynthesis to make
oxygen.
starches.
carbon dioxide.
protein. 8-2 Plants gather the sun's energy with light-absorbing molecules called pigments.

The main pigment in plants is chlorophyll.

There are two main types of chlorophyll:
chlorophyll a
chlorophyll b Light and Pigments
What is the overall equation for photosynthesis? The Photosynthesis Equation The colors of light that are absorbed by chlorophylls are
green and yellow.
green, blue, and violet.
blue, violet, and red.
red and yellow. 8-2 The principal pigment in plants is
chloroplast.
chlorophyll.
carotene.
carbohydrate. 8-2 In van Helmont's experiment, most of the added mass of the tree came from
soil and carbon dioxide.
water and carbon dioxide.
oxygen and carbon dioxide.
soil and oxygen. 8-2
What is the role of light and chlorophyll in photosynthesis? Light and Pigments Photosynthesis is the process in which green plants use the energy of sunlight to convert water and carbon dioxide into high-energy carbohydrates and oxygen. 8-2 Photosynthesis: An Overview The raw materials required for plants to carry out photosynthesis are
carbon dioxide and oxygen.
oxygen and sugars.
carbon dioxide and water.
oxygen and water. 8-2 When chlorophyll absorbs light, much of the energy is transferred directly to electrons in the chlorophyll molecule.

These high-energy electrons are what make photosynthesis work. Light and Pigments Light and Pigments How do plants capture the energy of sunlight?

In addition to water and carbon dioxide, photosynthesis requires light and chlorophyll. Light and Pigments Light Light 8-2 Photosynthesis: An Overview Light energy Wavelength (nm) Chlorophyll a Chlorophyll b 400 450 500 550 600 650 700 750 100

80

60

40

20

0 Estimated Absorption (%) Wavelength (nm) Light and Pigments Chlorophyll absorbs light well in the blue-violet and red regions of the visible spectrum.
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