Studied by 0 people
Looks like no one added any tags here yet for you.
What percentage of energy comes from the sun vs how much is captured by life processes?
90% of Earth’s energy comes from the sun and 1% of that is used for life processes
Break down photosynthesis definition
photo means light, synthesis means to put together
thus photosynthesis is the formation of molecules using light energy
How does photosynthesis feed the biosphere
photosynthesis directly or indirectly powers almost all life
because it gives energy to plants, plants give energy to animals,
Autotroph
organisms that sustain themselves without consuming other organisms
cos’ they can produce their own nutrients (organic) with CO2 and other inorganic molecules
Producers of organic molecules in the biosphere
Types of Autotrophs
Photoautotrophs
Chemoautotrophs
Heterotrophs
Cannot obtain their own nutrients so they get it from consuming other organisms or organic susbtances
they are the consumers and the decomposers of the biosphere
(ex. animals fungi, bacteria)
Types
Types of Heterotrophs
animals (consumer), fungi, bacteria (both consumer decomposer
Who are the Photoautotrophs (4)
Plants
Cyanobacteria
Multicellular alga (kelp)
Unicellular protists (euglena)
Cyanobacteria, structure, function
a photosynthetic prokaryote (photoautotroph)
has a thykaloid membranes embedded with phycobilisome proteins that taken in light
the pychobilisome have chlorophyl which allows photosynthesis
Endosymbiosis hypothesis review with pychobillosome
these proteins have the same chlorophyll of plants because prokaryote they share common ancestors (archea)
Define chroloplasts main function and structure
photosynthetic organelles found in plant and algae cells (converting light energy into chemical energy)
stroma: the fluid inside the chloroplast like cytosol (from phagocytosis)
inside the stroma is a system of membrane sacks called,
Thykaloids: compartments in the chlroroplasts which stack to form Granum
and also have interiror space called Thykaloid space
finally chloroplasts has an
inner membrane
outer membrane
Differentiate Chlrophyll from plasts and note why their important
chlrophyll is the green pigment in the chlroroplasts and it is involved in absorbing light energy
Explain leaf structure,
Define Mesophyll and their importance
Define stomata and its importance
in the leaf tissue you have mesophyll in the middle interior, this where chloroplasts are concentrated
one of its cells carry 40-50 chloroplasts
on skin of leaf tissue you have stomata attached. they are modified epithelial cells which serves as pores for CO2 and O2 to enter/leave
Write out the Photosynthesis equation
and explain it
6CO2 + 6H2O + light energy → C6H12O6+6O2
first part is the reactants (redox)
6CO2 molecules enter the leaf through stromata pores
carbon of CO2 gets reduced to form carbohydrates
6H2O (water) enter the plant through plants roots
water gets oxidized to form O
the light energy is absopred by chlorophyll
after all this is combined it forms
products:
when electrons from water are oxidized they are given to glucose
Glucose C6H12O6 and oxygen 6O2
(redox is opposite to cellular respiration)
What are 2 stages of photosynthesis
Light reaction (photo)
Calvin Cycle (synthesis)
Light reaction briefly explain, also reactant and product
Takes place in the Thylakoid space of chloroplasts, where light energy photons are absorbed and converted into into ATP and NADH
water molecules are spilt by enzymes and release oxygen (electrons)
which go to NADPH (to sugar later on)
high energy electrons are carried by NADPH to ETC where they power photophosphorylation
electrons and energy produces ATP
produces oxygen O2
and converts NADPH back NADP
reactant: H2O
product: O2, ATP, NADP
Define NADPH
an electron carrier reducing agent in photosynthesis
Calvin Cycle briefly explain, also reactant and product
Oxygen enters in the stroma
uses ATP and NADPH from light reactions to convert CO2 to sugar
reactant: O2, CO2, ATP, NADPH
product: Glucose
Note 
Flashcard (33)