photosynthesis☀️🪴 Flashcards
(31 cards)
how are grana adapted for their function
- contain ETC/ ATP synthase
- large SA for light absorption
where in chloroplast is the metabolic pathway involving co2
stroma
why is the theoretical rate of photosynthesis not achieved as light intensity increases
- temperature is a limiting factor as the calvin cycle relies on enzymes
- co2 is a limiting factor as it is required for calvin cycle
how are plants adapted to live in shade
- more chloroplasts
- more grana
- larger leaf SA
how are heterotrophs reliant on plants
- heterotrophs have to eat plants for glucose
- autotrophs produce glucose and oxygen by photoaynthesis
- heterotrophs need oxygen for respiration
name an accessory pigment
- carotene
- chlorophyll b
what is the first stable product of carbon dioxide fixation
glycerate 3 phosphate
what is the compound regenerated in the calvin cycle so more co2 can be fixed
RuBP
name a compound that can be formed from TP but not as a part of the calvin cycle
amino acid
what is an autotroph
can make organic molecules from inorganic molecules
what is a heterotroph
relies on organic molecules produced by another organism
what are fat droplets in the chloroplast for
- membrane formation
- fatty acid synthesis
how is light harvested in chloroplast membranes
- pigments form antenna complex
- photon absorbed by pigment
- electron excited and returned to pigment
- photon passed from one pigment to another
- photon passed to reaction centre
- range of accessory pigments allow range of wavelengths to be absorbed
effect of blocking movement of electrons between electron carriers on photosynthesis
- prevents non cyclic photophosphorylation
- no electrons available to form NADPH
- less ATP and NADP for calvin cycle
problems with using o2 production/ co2 uptake to measure photosynthesis rate
- oxygen only produced in one stage
- oxygen produced may be used for respiration
- carbon dioxide only used in one stage
- carbon dioxide uptaken may be used for photosynthesis
how does a chemical that binds to electrons in photosystem i lead to death of plant
- prevents cyclic and non cyclic photophosphorylation
- less NADPH for calvin cycle
- no glucose made for respiration
final electron acceptor in light dependent stage of photosynthesis
NADP
how many carbons does RuBP contain
5
what does rubisco do
converts RuBP to 6 carbon compound
when is CO2 used in the calvin cycle
-one CO2 fixed to RuBP to form 6C compound
when is ATP used in the calvin cycle
- 2 ATP used to convert 2GP into 2TP
- 1ATP used to convert 2 TP into RuBP
when is NADPH used in the calvin cycle
2 NADPH used to convert 2GP to 2TP
where is PSII located
beginning of ETC
where is PSI located
middle of ETC
