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Photosynthesis - Innovative Learning Solutions (光合作用,创新的学习解决方案)
10
Photosynthesis
Concept Outline
10.1 What is photosynthesis?
The Chloroplast as a Photosynthetic Machine. The
highly organized system of membranes in chloroplasts is
essential to the functioning of photosynthesis.
10.2 Learning about photosynthesis: An experimental
journey.
The Role of Soil and Water. The added mass of a
growing plant comes mostly from photosynthesis. In plants,
water supplies the electrons used to reduce carbon dioxide.
Discovery of the Light-Independent Reactions.
Photosynthesis is a two-stage process. Only the first stage
directly requires light.
The Role of Light. The oxygen released during green
plant photosynthesis comes from water, and carbon atoms
from carbon dioxide are incorporated into organic molecules.
The Role of Reducing Power. Electrons released from
the splitting of water reduce NADP+; ATP and NADPH
are then used to reduce CO2 and form simple sugars. FIGURE 10.1
Capturing energy. These sunflower plants, growing vigorously
10.3 Pigments capture energy from sunlight. in the August sun, are capturing light energy for conversion into
The Biophysics of Light. The energy in sunlight occurs chemical energy through photosynthesis.
in “packets” ca ed photons, which are absorbed by pigments.
Chlorophylls and Carotenoids. Photosynthetic
pigments absorb light and harvest its energy. ife on earth would be impossible without photosyn-
Organizing Pigments into Photosystems. A Lthesis. Every oxygen atom in the air we breathe was
photosystem uses light energy to eje
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