Biology digital notes for highschool students. Easy to read and understand illustrative notes. Detailed explanation of every topic. Reading of this document is tough for understanding the important concepts of the topic
Photosynthesis involves conversion of light energy into chemical
energy.
Photosynthesis involves convention of inorganic molecules into
organic molecules.
Photosynthesis is an anabolic reaction. This is an endothermic or
endergonic reaction.
It is physico-chemical process.
-
anabolic process: C-C bond formation.
oxidation - reduction reaction.
Chemosynthesis:
→ Performed by few bacterias like nitrifying bacteria ; thiobacillus
Plant photosynthesis Bacterial photosynthesis
+
+ H2S >
& H donor
H2D -
& H donor
-
expt BGA
Oxygenic anoxygenic
chloroplast x
chloroplast
(chromatophore)
Chlorophyll a
,
b, c
400
- 700 um
x
chlorophyll
insted-bacterio purpurin ;
visible septrum bacterio viridin
infrared region
,Variegated leaf experiment
This experiment proved that light is very important for photosynthesis.
SIN
veriegated
by
leaf
black
starch test-ve
"I
paper exposed
leaf
·
·
sunlight received ↑
photosynthesis
glucose
starch
starch test
&
Destarched plant
Ve
Raw materials for photosynthesis
Oxygen
Carbon dioxide
Sunlight
Chlorophyll
Moll’s Half leaf experiment
KOH combines with all the carbon
dioxide present in the Test tube.
No CO2 left therefore, no
photosynthesis, no glucose, no
starch >> starch test negative
Leaf outside the test tube gets CO2
therefore,photosynthesis, glucose,
starch >> starch test positive.
This experiment shows that CO2
very important for photosynthesis.
, Bell jar experiment
Joseph priestly
(1733-1803)
Priestly sir hypothesised that air contaminated by mic and candle was
actually restored by mint-plant.
He discovered oxygen in 1774.
He suggested the role of air in growth of plants.
Jan Ignenhousz (1730-1799)
He used a set-up similar to what used by priestly.
He placed it once in dark and once in light.
He took aquatic plant (hydrilla) & kept it in sunlight.
Bubbles of oxygen were obser ved therefore Photosynthesis must have
taken place.
When put in dark, no bubbles were formed. Therefor no photosynthesis
had occurred .
Von Sach experiment
Julius von sach (1854) Chloroplast → chlorophyll → glucose → starch (storage )
Sach>> storage
Chlorophyll pigment is present in special boadies : chloroplast
Glucose → starch & Chlorophyll → chloroplast
T.W Engelman
It was seen that most aerobic bacterias were accumulated
in blue and red region.
Therefore we can say that blue and red region leads to
formation of more oxyen due to more photosynthesis. Acorobic
bacteria
This gives us the “first action sepectra”. L
I
·
Cladophora → multicellular filamentous green algae B
e
Aerobic bacteria
White
minimum
Morea
Amount of oxygen released is directly
proportional to the rate of photosynthesis
prism Cladophora
Action spectrum (green alga)
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