Which out of the following statements is incorrect? [2023]
Grana lamellae have both PS I and PS II.
Cyclic photophosphorylation involves both PS I and PS II.
Both ATP and NADPH + are synthesised during non-cyclic photophosphorylation.
Stroma lamellae lack PS II and NADP reductase.
(2)
Cyclic photophosphorylation is a process of light reaction during which an excited electron expelled by the photoreceptor (PS I) is returned to itself, i.e., (PS I) after passing through a series of electron carriers. It occurs under conditions of low light intensity, wavelength longer than 680 nm and when carbon dioxide fixation is inhibited. It is performed by photosystem I only. The cyclic flow hence, results only in the synthesis of ATP, but not of NADPH +
Which of the following combinations is required for chemiosmosis? [2023]
Proton pump, electron gradient, ATP synthase
Proton pump, electron gradient, NADP synthase
Membrane, proton pump, proton gradient, ATP synthase
Membrane, proton pump, proton gradient, NADP synthase
(3)
Chemiosmosis requires a membrane, a proton pump, a proton gradient and ATP synthase.
Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis? It involves [2022]
breakdown of proton gradient
breakdown of electron gradient
movement of protons across the membrane to the stroma
reduction of NADP to on the stroma side of the membrane.
[2]
In the light reaction, plastoquinone facilitates the transfer of electrons from [2020]
PS-II to Cytf complex
Cytf complex to PS-I
PS-I to NAD
PS-I to ATP synthase
(1)
After excitement, is passed from PS-II () to primary electron acceptor (Pheophytin). From primary acceptor, is passed to plastoquinone. Plastoquinone (PQ) in turn transfers its e? to Cyt b?f complex. Therefore plastoquinone facilitates the transfer of electrons from PS-II to Cyt b?f complex.
In a chloroplast, the highest number of protons are found in [2016]
intermembrane space
antennae complex
stroma
lumen of thylakoids
(4)
