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TLS Online TPP Program

#Question id: 10132

Which of the following statements would be correct for photophosphorylation ?

#Unit 6. System Physiology – Plant
  1. Water is oxidized and protons are released in the lumen by PSII and reduces NADP+ to NADPH in the stroma both are spontaneous processes becoz their reduction potential is positive
  2. The sequential absorption of four photons (excitons) —known as S states, each absorption causing the loss of one electron from the Mn4Ca cluster, produces an oxidizing agent that can remove four electrons from two molecules of water, producing O2, the electrons lost from the Mn4Ca cluster pass one at a time to an oxidized Tyr residue in a PSII protein, then to P680+
  3. An alternative path of electron is cyclic electron transfer, in which elctron move from ferredoxin back to the cytochrome b6 f complex, the cyclic pathway produces more ATP and Water produces but less NADPH produces than the noncyclic
  4. Transfer of the two electrons to PQB reduces it to PQB 2–, and the reduced PQB 2– takes two protons from the stroma side of the medium, yielding a fully reduced plastohydroquinone (PQH2), the PQH2 then still remain bounded from the reaction center complex
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TLS Online TPP Program

#Question id: 9277

#Unit 6. System Physiology – Plant

The light energy absorbed by the carotenoids is transferred to chlorophyll for photosynthesis; because of this role they are called
TLS Online TPP Program

#Question id: 9278

#Unit 6. System Physiology – Plant

Bilin pigments are open-chain tetrapyrroles found in antenna structures known as phycobilisomes that occur in
TLS Online TPP Program

#Question id: 9279

#Unit 6. System Physiology – Plant

During the normal functioning of the photosynthetic system, the chemical reactions in which water is oxidized to oxygen, NADP+ is reduced to NADPH, and ATP is formed almost all the reactions up to NADP+ reduction take place in
TLS Online TPP Program

#Question id: 9285

#Unit 6. System Physiology – Plant

Non-O2-evolving (anoxygenic) organisms, contain only a single photosystem such as
TLS Online TPP Program

#Question id: 9583

#Unit 6. System Physiology – Plant

 A mechanism known as the Q cycle accounts for most of the observations in which structure and reactions of plastoquinone that operate in,
TLS Online TPP Program

#Question id: 9585

#Unit 6. System Physiology – Plant

In light reaction the reaction centre of PSII  receives electron from water molecules by splitting into oxygen, If 5 oxygen molecules evolved per 50 quanta was

absorbed then what is the quantum yield?