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Bio Ch9, By chlorophyll, +Minerals, B (compensation point) - Coggle Diagram
Bio Ch9
9.2 Gas exchange in plants
Structure of a leaf
Cuticle
Upper epidermis
Palisade mesophyll
Spongy mesophyll
Vascular bundle
Pholem
Organic nutrients(mainly sugar)
Xylem
Minerals
Airspace
Lower epidermis
Cuticle
Stoma
3 more items...
Mesophyll
Chloroplasts for photosynthesis
Epidermis is the outermost
Protects inner layer
Waxy layer
Prevents excessive water loss
In terrestrial plants
IN
Environment
Air space (through stomata)
Dissolve in H2O film then into cell
gases diffuse 2 neighboring cells
OUT
Produced by cells
Gases diffuse 2 neighboring cells (again)
Diffuse 2 H2O film
Diffuse into air space, out through stomata
Adaptations
The whole leaf
Broad and flat
Large surface area
Large in number
Thin
Shorten diffusion distance
Internal structure
loosely packed
Large surface area
Numerous air sac
Gases diffuse freely
A water film
Gases dissolve
Stomata
Into and out of the leaf freely
Guard cells
Rate of gas exchange can be regulated
Aquatic plants
Submerged plants
No cuticle
Thus few to no stomata
Floating plants
Stomata only on upper epidermis
Gas exchange in stem
Herbaceous plants
Have stomata
Woody plants
Covered by layer of cork
Lenticels (cannot be opened or closed)
Light intensity effect on gas exchange
Day
Photosynthesis > respiration
Net uptake of CO2
Net release of O2
Night
Only respiration
Net uptake of O2
Net release of CO2
DIAGRAM
Net release of CO2
A
Net release of O2
Light intensity
Only respiration
Net uptake of O2
Net release of CO2
Photosynthesis > respiration
Net uptake of CO2
1 more item...
Net release of O2
CO2 concentration limit
Light intensity limit
9.1 Nutrition in plants
Autotrophs
CO2 + H2O
Light energy
Carbohydrates + O2
Proteins and lipids from intermediates of photosynthetic reactions
Producers
Importance of minerals to plants
Major elements
Nitrogen(N)
NO3 - and NH4+
synthesis of amino acids. proteins, nucleic acids and chlorophyll
Poor growth
Yellow leafs
Phosphorus(P)
PO4 3-
Synthesis of cell membranes, ATP, nucleic acids and required on some enzymatic reactions
Leaf turn purple
Potassium(K)
K+
Promotes photosynthesis and transport, required in some enzymatic reactions
Blackened leaf edges
Magnesium(Mg)
Mg 2+
Synthesis of chlorophyll
Trace elements
By chlorophyll
+Minerals
B (compensation point)
X