CHAPTER 7 Flashcards
name the first organisms on earth to perform photosynthesis.
-Cyanobacteria (which mean blue/green) so it had chloroplast (pond scum)
First time
-Oxygen gas was introduced to the atmosphere
write out the balanced equation of photosynthesis.
6CO2 + 6H2O –sunlight→ C6H12O6 +6 O2
where does photosynthesis take place in a plant cell? how does the plant get the reactants of photosynthesis?
-Photosynthesis (in general) types place in the leaves (organelle = chloroplast)
-How does CO2 get into the leaves? With pores under the leaves called stomata
-How does water get into the leaves? It is absorbed in the roots and with cohesion properties is pulled to the leaves
what is the name of the main photosynthetic pigment?
Main pigment is chlorophyll (A): absorbed light; mainly the red and the blue violet light
why does chlorophyll appear green to our eyes?
It appears green because it is absorbing mainly blue red violet light the green wavelengths of light is being reflected
what are the two parts of photosynthesis?
-light reaction
-Calvin cycle
define light reaction. where is this located within the chloroplast?
-Light reaction: process of chloroplast converting sunlight energy into ATP; at the same time water is split to form oxygen.
-In the chloroplast but specifically it is in the thylakoids (membrane)
define Calvin cycle. where is this located within the chloroplast?
-Calvin cycle: taking the carbon dioxide and converting it to glucose; process: light reaction creates ATP which is used to convert CO2 into glucose.
-In the chloroplast but specifically it is in the stroma (thick fluid)
what is the function of accessory pigments?
-Accessory pigments absorb different wavelengths of visible light (that chlorophyll A cannot) and pass that energy onto chlorophyll A (this makes photosynthesis more efficient)
What are the primary/main and accessory pigments in plants?
-main:
Chlorophyll (A); green
-accessory:
Beta-carotene -orange
Xanthophyll - yellow
Chlorophyll (B) - brown green
what are the three possible fates of glucose (in the plant cell) that is made by photosynthesis?
-About 50 % of glucose (instant energy) is used as fuel for cellular respiration to make ATP
-Where does cellular respiration take place? Mitochondria
-Some are made into cellulose
-What is its function? Structural support.
-Where is it found? Cell wall.
-Excess glucose can be stored as starch
-What is its function? Energy source.
-Where is it found? All over the plant
