Question

When does non cyclic photophosphorylation and cyclic photophosphorylation occurs?

Answer 1

non cyclic occur when light wavelength below 680nm and cyclic occur when wavelength above 680 nm bcz in non cyclic presence of both photo pigment PS1and PS2 but in cyclic presence of only PS1

Answer 2

Cyclic phosphorylation occurs in stromal lamellae as these lack PS II and NADP reductase enzyme.

Granal lamellae have both PS II and NADP reductase enzyme thus these lamellae conduct non– cyclic phosphorylation.

In bright sunlight (with a large component of blue light), PS II absorbs more light than PS I, hence both the photosystems work resulting in non–cyclic phosphorylation.

In less intense light with more red (in the shade), PS I absorbs more light than PS II resulting in cyclic phosphorylation.

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