-->

Photosynthesis In Higher Plants

Question
CBSEENBI11003338

In photosynthesis what occurs in PS-II?

  • It takes longer wavelength of light and e- from H2O

  • It takes shorter wavelength of light and e- from H2O

  • It takes longer wavelength of light and e- from NADP

  • It takes shorter wavelength of light and e- from NADP

Solution

B.

It takes shorter wavelength of light and e- from H2O

Green plants and algae use two type of photo-system called Photosystem- I (PS-I) and Photosystem- II (PS -II).

In PS-I, chlorophyll absorb maximum at 700 nm wavelength of light thus reaction centre is P700 and PS-II absorb maximum at 680 nm wavelength of light thus reaction centre is P680. P680 (PS-II) extracts an electron from water, returning to its unexcited state because hydrolysis of H2O occurs in PS-II. So, O2 evolved in PS-II come from water.