Question

Explain Cyclic and Non Cyclic Photophosphorylation.

Answer 1

ANSWER



CYCLIC AND NONCYCLIC PHOTOPHOSPHORYLATION



The photophosphorylation process which results in the movement of the electrons in a cyclic manner for synthesizing ATP molecules is called cyclic photophosphorylation.


The photophosphorylation process which results in the movement of the electrons in a non-cyclic manner for synthesizing ATP molecules using the energy from excited electrons provided by photosystem II is called as non-cyclic photophosphorylation.


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Answer 2

ANSWER.

☆☆ NON - CYCLIC PHOTOPHOSPHORYLATION ☆☆

¤ It occurs when the two Photo Systems work in a series through the electron transport chain as soon in the Z- scheme.

¤ Here, ATP and NADPH + H ion are synthesized.

¤ It is a non -cyclic process because the electrons lost by Photosystem II do not come back to it but pass onto NADP+ .

¤ It Occurs on Thyllakoid Membrane.



☆☆ CYCLIC PHOTOPHOSPHORYLATION ☆☆

¤ It occurs in Stroma lamellae when only Photosystem I is a functional.

¤ The electron is circulated within the photosystem and ATP synthesis occurs due to cyclic flow of electrons.

¤ The lamellae of grana have Photosystem I and Photosystem II. The stroma lamellae membrane lack PS II and NADP reductase.

¤ The electron does not pass on to NADP+ but is cycled back to Photosystem I complex through electron transport chain.

¤ Here, only ATP is synthesised .

¤ Cyclic Photophosphorylation also occurs when only light of wavelengths beyonds 680nm are available.

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