2. Acknowledgement
I would like to express my special thanks of gratitude to my teacher
Mrs. Namita Jha as well as our principal Dr. Ram Singh who gave
me the golden opportunity to do this wonderful project on the topic
Photosynthesis, which also helped me in doing a lot of Research and
I came to know about so many new things I am really thankful to
them. I would also like to thank my parents and friends who helped
me a lot in finalizing this project within the limited time frame.
3. Certificate
This is to certify that Mr. Ashutosh Dayal student of class X G has
successfully completed his Biology Project on “Photosynthesis” under the
guidance of Mrs. Namita Jha .
Mrs.Namita Jha Mr. Ashutosh Dayal
4. Introduction
All life needs a constant input of energy
Autotrophs
They get energy from sunlight
They build organic molecules(food)
from CO2
Makes Energy and Synthesise sugar
through Photosynthesis
Hetrotrophs
Get energy directly or indirectly
through autotrophs
5. Photosynthesis
The complex process by which green plants, in the
presence of sunlight, synthesize nutrients.
Carbon dioxide and water synthesized to form
glucose, oxygen and energy.
Process that converts solar energy into chemical
energy.
Chloroplast are major site for photosynthesis.
6. Chloroplast: Site of Photosynthesis
The organelles in the cells of green plant which contains chlorophyll
are called chloroplasts.
Chloroplasts are the site of photosynthesis as they contain chlorophyll
pigment. These organelles are present in photosynthetic cells of green
plants. These contain the light absorbing green pigment called
chlorophyll.
Chloroplasts can be seen as disc like structure in the cross section of
leaf using a microscope
7. Raw material for photosynthesis
1.CO2 : It is present in the atmosphere and enters the leaf through
stomata. Tiny pores present on surface of leaves which Massive
amount of gaseous exchange take place.
2.H2O : Present in soil which are absorbed by roots. These water
molecules split in the presence of sunlight to form hydrogen and
oxygen. This is called photolysisof water.
3.Minerals: Mineral nutrients like nitrogen ,Phosphorus iron and
magnesium and also taken up from the soil. Nitrogen is an
essential element which is used to synthesise proteins and other
compounds.
8. Conditions necessary for photosynthesis
1. Sunlight : Intensity, quality and duration of sunlight affect the
rate of photosynthesis.
2. Chlorophyll : A green colored photosynthetic pigment found in
chloroplast of a plant. It is responsible for trapping solar energy
9. Events in photosynthesis
Absorption of light energy by chlorophyll.
Conversion of light energy into chemical energy and splitting of
water molecules into hydrogen and oxygen.
Reduction of carbon dioxide into carbohydrates
10. Famous discoveries
Jullus Von Sachs - proved that during photosynthesis glucose is
formed.
T.W.Englmann - proved that in blue and red light maximum
photosynthesis takes place.
Cornelius Van Neil - discovered the key chemical process of
photosynthesis.
