Download 16- Notes: Photosynthesis Part I Photosynthesis LB Pat I

PHOTOSYNTHESIS
PART I: FOOD FOR
PLANTS
UNIT II: CELL RESPIRATION & PHOTOSYNTHESIS
KL BIOLOGY
BUECHLER
WHAT’S FOOD FOR PLANTS?
WHERE DO PLANT’S GET THE BUILDING BLOCKS FOR GROWTH?
ARE SOIL AND WATER FOOD FOR PLANTS?
INITIAL IDEAS:
• IT’S O.K. TO NOT BE CORRECT HERE!
SOIL COMPOSITION
• ORGANIC MATTER
• DEAD/DECAYING ORGANISMS
• MINERAL MATTER:
•
•
•
•
•
•
•
•
•
•
•
•
NITROGEN
PHOSPHORUS
POTASSIUM
CALCIUM
MAGNESIUM
SULFUR
MANGANESE
COPPER
ZINC
BORON
CHLORINE
MOLYBDEENUM
So what’s “air” made of? Anything the
plants might need from air?
SOIL COMPOSITION
• AIR
• NITROGEN
• OXYGEN
• CARBON DIOXIDE
• ARGON
• OTHER GASES
DO AIR AND SOIL SHARE ANY
INGREDIENTS?
NITROGEN
Why might plants need
Nitrogen? (or do they?)
COMPARING LABELS
• YOU WERE ASKED
TO ANALYZE THE
FOLLOWING
LABELS:
• ENERGY=
CALORIES
• BUILDING
BLOCKS FOR
GROWTH=
CARBS,
PROTEINS AND
LIPIDS
• MINERALS=
ANYTHING
FROM THE
PREVIOUS LIST
COMPARING LABELS
Item
Energy (Calories? Carbs, Proteins,
Lipids?
Minerals?
Bottled H2O
None
None
None
Soil
Very Little
(organisms)
Very Little
(organism)
Lots
Multi-Vitamin
None
None
Lots
Plant Fertilizer
None
None
Lots
Human food
(Cheeseburger)
Lots
Lots
Very little
2 THINGS PLANTS NEED TO GROW:
• WATER
• PLANT FOOD
ARE THESE ITEMS “FOOD” BY SCIENTIFIC DEFINITION?
• FOOD= SOMETHING THAT PROVIDES ENERGY AND BUILDING BLOCKS FOR
GROWTH
• BE SURE Q6 IS ANSWERED
COMPARING LABELS
Item
Energy (Calories? Carbs, Proteins,
Lipids?
Minerals?
Bottled H2O
None
None
None
Soil
Very Little
(organisms)
Very Little
(organism)
Lots
Multi-Vitamin
None
None
Lots
Plant Fertilizer
None
None
Lots
Human food
(Cheeseburger)
Lots
Lots
Very little
SO IS PLANT FOOD MORE LIKE HUMAN FOOD OR MORE
LIKE A MINERAL SUPPLEMENT?
ANSWER Q7 IN A COMPLETE SENTENCE IF YOU HAVEN’T
HUMAN FOOD OR MINERAL
SUPPLEMENT?
Soil
Human Food
Multi-Vitamins
Little bit of “organic matter” protein,
carbs and lipid
Lots
Of
Minerals
H2O
FOR Q8: WHAT’S THE EVIDENCE FOR PLANT FOOD BEING
MORE LIKE A MINERAL SUPPLEMENT THAN HUMAN FOOD?
VAN HELMONT’S EXPERIMENT
Initial
Weight
Tree
Soil
5
200
Final
Weight
169.1875
199.875
Change in
Weight
164.1875
0.125
• IS SOIL FOOD FOR
PLANTS?
• HOW DO YOU
KNOW?
• IS MINERAL CONTENT
OF SOIL ENOUGH TO
EXPLAIN THE
DIFFERENCE?
Q10, 11, 12 AND 13
WHERE
DO
PLANTS
GAIN
MASS
FROM?
WHERE
DOES
THE
CARBON
COME
FROM?
SOURCES OF C, H & O
• SO CO2 IS ONE SOURCE OF CARBON THAT ALLOWS A
PLANT TO BUILD MASS
• GLUCOSE IS THE OTHER
• NEEDED TO MAKE STARCH OR CELLULOSE
• PLANT CELL WALLS ARE MADE FROM CELLULOSE
REVIEW: RESPIRATION CHEMICAL
FORMULA
Q 18
Q19:Carbon, Hydrogen and Oxygen are
needed to build glucose
PRIESTLY’ S EXPERIMENT
PRIESTLY’S EXPERIMENT