Solar energy is the primary energy source for plant life on Earth. Photosynthesis captures light energy through carbon dioxide fixation, transforming light energy into stable carbohydrates that provide energy for all organisms. Plants use chloroplasts to capture photons during photosynthesis, and mitochondria to release energy during respiration through oxygen, carbon dioxide, water and ATP production. Plants photosynthesize during the day to produce oxygen and fix carbon, while at night they respire and consume oxygen.

1. BOTANY
by A.Cloutier 2012
copyright
An Introduction to Flora
acloutier 2012 botany copyright

2. What is the source of energy for plant life ?
• Solar energy is the primary energy source for
radiant energy on Earth
• The transfer of heat energy through water on
the surface of Earth creates a variety of solar
heat energy resources
• Can you think of some examples of heat or
water movement ?
acloutier 2012 botany copyright

3. Photosynthesis
acloutier 2012 botany copyright

4. The Plant Cell
acloutier 2012 botany copyright

5. Green Solar Cells
acloutier 2012 botany copyright

6. Intelligent design using Nature
• Portland , Oregon
• 200 foot high building uses
plants to keep building cool
in summer, and in fall, leaves
get dropped, and Sunlight
penetrates through glass for
Solar radiation inside
building.Saving $280,000 in
eergy heating and cooling
cost per year
acloutier 2012 botany copyright

7. From radiant energy to sugars
• Chloroplast are most • Photosynthesis captures light
important in photosynthesis energy through the fixation of
carbon dioxide from the
because they provide the atmosphere into energy-rich
means of capturing photons carbon compounds called
(a particle of light) and inside carbohydrates
the living plant organism.
• The transformation of
unstable light energy into
stable, storable plant cells as
carbohydrates provide the
primary energy resource for
all life organisms in photic
zone acloutier 2012 botany copyright

8. Mitochondrion Structures and Function
Around the mitochondria, cell respiration releases energy >oxygen, carbon
dioxide, water, energy and carbohydrates > energy held within the carbohydrates
transferred to ATP energy carrying compounds located in the inner membrane
acloutier 2012 botany copyright

9. Plants are busy when the sun is shines and even
when its night time
• Photosynthesis occurs within • During daylight hours , green
photosynthetic cells only plants liberate more oxygen
when light energy is available through photosynthesis than
• Respiration is a continuous they require for respiration.
process within both • They also take in more
photosynthetic and carbon dioxide than they
nonphotosynthentic cells release.
because life processes • *At night only respiration
demand a continual supply occurs and plants use up the
of cellular energy oxygen and liberate carbon
dioxide thereby drawing
upon available atmospheric
oxygen
acloutier 2012 botany copyright

10. Take a breath, and thank the plants on Earth for
making the oxygen we need to breath
acloutier 2012 botany copyright