2.7 Photosynthesis Flashcards
The basic source of energy that sustains life begins with _
sunlight
Sunlight is absorbed by a green pigment known as _.
chlorophyll
The _ layer of the leaf contains the largest number of chloroplasts and is in the best position to trap the maximum amount of solar energy.
mesophyll
Accordingly, there are two distinct parts in chloroplasts: _ and _.
Granum and Stroma
_ consists of stacks of flattened sacks, each of which is called thylakoid.
Granum
_ contains the chlorophyll, enzymes and cofactors that participate in the light trapping phase of photosynthesis
Granum
The light reaction takes place in _.
granum
_ is a gel-like colorless matrix, which is a site for sugar (carbohydrate) synthesis through carbon fixation.
Stroma
It is from the sugar produced in the _ that is directly or indirectly converted to all organic compounds (including amino acids, proteins and lipids) virtually found in all organisms
stroma
The chloroplast contains _ and other light absorbing accessory pigments capable of absorbing light at different wavelengths.
chlorophyll
The light absorbing pigments of chloroplasts absorb most of the visible light, ranging from _ to_ nm.
400 – 700
Maximum light absorption of blue light occurs at wavelengths from _ to _ nm.
400 – 500
Maximum light absorption of red light occurs at wavelengths from _ to _ nm.
600 – 700
Light ranging from 500 to 600nm that includes _ is not absorbed, it is rather reflected.
green light
_ this is also known as the light dependent stage.
Light reaction
_ takes place in the granum, where the light absorbing system – mainly chlorophyll occurs.
Light reaction
In light reaction, the _ is organized as Photosystems and Electron Transporting System.
granum
The photosystem of light reaction consists of chlorophyll that absorbs sunlight maximally at _ and _ range of light spectrum.
blue and red
The light absorbed by the chlorophyll will split of_ molecules.
water
_ is the split of water molecules into H+ and O2.
Photolysis
The _ is released to the atmosphere through leaf stomata
O2
The light absorbed by the chlorophyll will excite some electrons in the chlorophyll molecule to _ energy level which pass down the ETS (Electron Transporting System) and generate high energy _ molecule.
higher, ATP
The ATP and H+ harvested during light reaction will be used as an input in the stroma where conversion of _ to _ takes place.
CO2, carbohydrate
_ is also known as light – independent stage
Dark reaction
_ can occur in the absence of light as long as there is sufficient amount of H+ and ATP supplied from the light reaction.
Dark reaction
The dark reaction and enzymatic reaction H+ indirectly combines with _, in the stroma of chloroplast.
CO2
The process by which the dark reaction and enzymatic reaction H+ indirectly combines
with CO2, in the stroma of chloroplast is known as _.
carbon fixation
_ is the immediate result of the dark reaction.
Glucose (carbohydrate)
The overall chemical reaction of photosynthesis can be summed up in the following equation:
6CO2 + 6H20 Chlorophyll (Sunlight)———————–> C6H12O6 + 6O2
A simple way of demonstrating _ in leaves is testing a leaf for starch.
food synthesis
You can easily see the effect of iodine on starch, if you put iodine solution on powdered starch, piece of bread or potato slice, a _ color will develop confirming the presence of starch.
blue-black
The _ of the leaf is impermeable to iodine.
cuticle
The leaf has green pigment _ that interferes with the coloring effect of iodine.
chlorophyll
