Transcript Lesson: Photosynthesis Subject: Biology Grade: 10

Lesson: Photosynthesis Introduction
Subject: Biology
Grade: 9
By: Ali-reza Mobaraki
Main Menu
Some Terms
The Basics
Plant Cell
Plant cell continued
Cellular Respiration
Absorbance of Light
ATP
Z scheme
Some Terms
• Autotroph- an organism that is able to form nutritional organic
substances from simple inorganic substances such as carbon dioxide.
• Heterotroph- an organism deriving its nutritional requirements from
complex organic substances.
• Photoautotroph- any organism that derives its energy for food
synthesis from light and is capable of using carbon dioxide as its
principal source of carbon
Main Menu
The Basics
• Carbon dioxide + water  glucose + oxygen
• Energy for the reaction comes from the sun
• Carbon dioxide is obtained from atmosphere
• Water enters through roots
Main Menu
Plant Cell
• Plant cells have a cell wall
• Photosynthesis occurs in Chloroplast
• Cell respiration occurs in Mitochondrion
• Cell wall provides structural support
Main Menu
Plant cell continued
• Light is absorbed by pigments called chlorophylls
• Chlorophyll reflects (does not absorb) the color green
• Chlorophyll is found within the chloroplast
Main Menu
Cellular Respiration
• Plants also go through cellular respiration
• The opposite of photosynthesis
• Occurs at a higher rate in the absence of light
Main Menu
Absorbance of Light
• Different pigments have different absorbance values
• Maximum absorbance is characterized by peak
• Wavelength of between 500-600 is reflected
Main Menu
ATP
• ATP is hydrolyzed to ADP by loosing terminal phosphate
• This process is highly exergonic
• Exergonic reactions are favor formation of products
Main Menu
Z scheme
• The Z scheme shows the flow of electron
• Photoexcitation occurs first at photosystem 2 then photosystem 1
• Energy for electron excitation comes from the sun
Main Menu
Where exactly does cell respiration occur?
A.) Mitochondrion
B.) Chloroplast
C.) Cell wall
The Chloroplast is where photosynthesis occurs
Return
The cell wall provides structural support
Return
Correct!
Forward
Chlorophyll a and b, reflect light at/between
what wavelength(s) ?
A.) 400 nm
B.) 300 nm
C.) 500nm-600nm
There is an absorbance peak near 400nm
Return
Chlorophyll a and b don’t have peak absorbance
at 300nm
Return
Correct
Forward
THE END
Return To Title
Slide