photosynthesis Flashcards

1
Q

l

what is photosynthesis

A

photo (light reaction) + synthesis (calvin cycle)

complex process by which carbon dioxide, water and certain elts (N,P) are converted into carbohydrates by green plants, algae and certain bacteria using chlorophyll

light energy (hv) converted into chemical energy (C6H12O6) in leaves

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2
Q

types of chlorophyll

A

Cla wider absorption spectrum (red, blue, purple) and Clb (blue)

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3
Q

PAR

A

Photosynthetically active radiation : wavelength spectrum where plants absorb sunlight (400-700 nm)

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4
Q

Chlorophyll a

A

contains Mg, essential nutrient released through weathering
C° of Cla used to estimate algae cC° in water with Org:Cla ratio=50

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5
Q

redfield ratio

A

C:N:P = 106:16=1
under optimal growth condition, amount removed by phytoplankton from water and gave back when dies, defines stoichiometry of photosynthesis

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6
Q

cyanobacteria and nitrogen

A

cyanobacteria can use N instead of nitraite for ammonium
while growth of other phytoplankton is limited by nitrate/ammonium C°, N is not the limit nutrient for cyanobacteria

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7
Q

20 essential elements for plants

A

macronutrients : C,H,O,N,P,K,Ca,Mg,S
micronutrients:Fe,Mn, B,Cl,Cu,Zn,Ni,Co,Na,Si,Mo

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8
Q

extented field ratio

A

C106 H263 N16 P
(Fe,Mn,Zn)0.01 (Cu,Ni,Cd…)0.001

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9
Q

why is Fe particularly important in the coean as a micronutrient?

A

idk

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10
Q

what affects PAR

A

time of the day, amount of clouds, water depth, shading, turbidity, water color, lake ice formation
Iz=I0e(-nz), n light ectinction coeef (m-1)
I = (umol.m-2.s-1

measured with a Secchi disk

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11
Q

euphotic zone

A

Depth of euphotic zone = 1% of initial sunlight intensity remains
z=(ln(I0)-ln(Iz))/n
I0=1, Iz=0,01=> ln()=4.6

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