Download Session 15 Handout

Botany – Session 15
I.
Photosynthesis = _________________________________
a. Importance of Photosynthesis
i. _______________________________________________
_______________________________________________
ii. Photosynthetic organisms provide food________________
_______________________________________________
iii. The process of photosynthesis involves the release of
_______________________________________________
1. This release of oxygen changed the atmosphere from
anaerobic to aerobic
2. Some of the oxygen in the atmosphere is in the form
___________________________
3. Ozone is important
__________________________________________
4. Atmospheric oxygen
__________________________________________
b. The Process
i. Green plants and certain other organisms use
_______________________________________________
_______________________________________________
Light
CO2 + H2O
Chlorophyll
(C6H12O6)n + O2
Carbohydrate
ii. Occurs in green plants, seaweed, algae, and certain bacteria
iii. _____________________________________________
iv. Glucose is used for energy to build new
______________________________________________
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v. Glucose can also be converted to
_______________________________________________
_______________________________________________
vi. Plants often produce _______________ glucose than they
can use, so they _____________________ as
carbohydrates in their ________________,
_________________ and _______________________ .
c. Where photosynthesis occurs
i. Leaves and green stems within specialized cell structures
called ________________________
ii. In each chloroplast there are disk-like compartments
called _______________________
iii. The thylakoids are stacked like pancakes - this is
called _________________________
iv. The grana lie suspended in a fluid
called _________________________
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d. How Photosynthesis Works
i. Beneath the upper epidermis are the palisade cells, which
_______________________________________________
ii. The stomata are
_______________________________________________
iii. Leaf veins carry __________________________________
iv. Carbon Dioxide enters through the ___________________
v. Chlorophyll contained in cells of the palisade and spongy
layers helps absorb sunlight
_______________________________________________
vi. Carbon Dioxide combines with water and is
photosynthesized into oxygen and sugar
vii. Oxygen escapes through the ________________________
viii. The sugar dissolved in water is carried throughout the
plant to ____________________________________
e. _______________________________________________
i. _______________________
ii. Light energy is trapped by pigments called chlorophyll and
converted to chemical energy
1. Chemical energy is in the form of________________
iii. There are two pigment systems:
1. _____________________________
2. _____________________________
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f. ___________________________________________
i. Also know as the
_________________________________________
ii.
________________________________________
CO2
RuBP Carboxylase
Carbohydrates
iii. This reaction is catalyzed by the _____________________
iv. The carbohydrate formed will then be stored
g. Different Forms of Chlorophyll
i. __________________ - Found in cyanobacteria and
photosynthetic eukaryotes
ii. __________________ - found in green algae and embryophites
iii. Chlorophyll c and d also exist
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