C17 Photosynthesis Flashcards
(59 cards)
Limiting factor
One factor needed in photosynthesis and is in short supply, reducing the rate of photosynthesis.
Light intensity affect on photosynthesis
Light needed, energy source, as light intensity increases, ATP and reduced NADP production increases, increasing rate of photosynthesis
CO2 conc affect on photosynthesis
Needed, source of carbon, increases CO2 conc increases rate carbon fixation, therefore increasing rate TP production
Temperature affect on rate of photosynthesis
As temp increases, rates of enzymes controlled reactions increase.
When do stomata close and how does this effect the rate of photosynthesis
Dry spells (when plants undergo water stress) to avoid water loss.
Preventing diffusion of CO2, decreasing rate light-independant reaction and eventually stopping photosynthesis
Is water a limiting factor in photosynthesis and why
Never, because by the time the water potential to become low enough to limit the rate, the plant would have already closed stomata and ceased photosynthesis processes.
Law of limiting factors states…
Rate of physiological process will be limited by factor in shortest supply
Effect reducing light intensity on Calvin Cycle
-Reduces rate light dependant stage
-Reducing quantity ATP and Reduced NADP
-Conc GP therefore increases and conc TP decreases, less TP generates less RuBP
-Reverse happens when light intensity increases
Effect temperature on Calvin Cycle
-All reactions Calvin Cycle catalysed by enzymes
-Lower temp, enzyme and substrate lower KE, less successful collisions, decreases rate reaction
-Decreases conc GP, TP, RuBP
-Same effect high temp, denaturing, irreversible
Effect Carbon Dioxide on Calvin Cycle
Low conc CO2, decreases conc GP (as there’s less CO2 to be fixed)
-Decreases conc TP
-Conc RuBP increases, still being formed from TP, but not being used to fix CO2
What does an ecosystem composition depend on
The amount of energy
Provide some ways energy consumption is used up
Homeostasis
Respiration
Growth and reproduction
How is ADP formed
ATP and an inorganic phosphate
The Calvin Cycle is the starting point of what
Making all the organic substances plants need (e.g glucose)
What are TP and GP used to make
Carbohydrates, lipids and amino acids
Carbohydrates (what they made up off)
Hexose sugars made joining 2 TP mols.
Larger carbohydrates (sucrose, starch, cellulose) made by joining hexose sugars different ways
Amino acids (what are they made from)
Some are made from GP
Lipids (what are they made from)
Made using glycerol, whichs synthesised from TP and fatty acids, whichs synthesised from GP
Whats chronography used for
Separating different pigments
Mobile phase
Solution containing mixture of pigments
Stationary phase
Think layer of silica gel applied to glass
Why do the pigments move at different rates up the TLC paper
Different solubilities in mobile phase and differing interactions with stationary phase leads to them moving different rates through silica gel
Retention value (Rf)
Distance travelled by component / Distance traveled by solvent
Name 5 different chlorophyll pigments
Carotene
Phaeophylin
Xanthophyll
Chlorophyll a
Chlorophyll b
