Non-Cyclic Photophosphorylation & Z Scheme — NEET Biology
📚 Practice ConceptATP is synthesised by cells (in mitochondria and chloroplasts) is named phosphorylation. Photophosphorylation is the synthesis of ATP from ADP and inorganic phosphate in the presence of light. When the two photosystems work in a series, first PS II and then the PS I, a process called non-cyclic photo-phosphorylation occurs. The two photosystems are connected through an electron transport chain, as seen earlier – in the Z scheme. Both ATP and NADPH + H+ are synthesised by this kind of electron flow.
Assertion (A): Non-cyclic and cyclic photophosphorylation produce different products. Reason (R): Cyclic photophosphorylation synthesises both ATP and NADPH + H+ while non-cyclic flow produces only ATP.
View solution & NCERT explanation
Correct answer: C — If assertion is true but reason is false.
NCERT confirms non-cyclic and cyclic photophosphorylation have different products (Assertion true). However, NCERT states “Both ATP and NADPH + H+ are synthesised by this kind of electron flow [non-cyclic]. The cyclic flow hence, results only in the synthesis of ATP, but not of NADPH + H+” - the Reason swaps the products of each process (false). This tests understanding of what each type of photophosphorylation produces.
What does NCERT say about ATP synthesised by cells?
Has this concept appeared in NEET?
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