Based
on the above equation, answer the following questions
(a) Where
does this reaction take place in plants?
(b) What is the
significance of this reaction?
Answer:
(a) The reaction takes
place in reaction centre PS II, located on the inner surface of thylakoid
membrane. It is known as water splitting centre where electrons are extracted
from water. The 
and
ions
catalyse this reaction.
(b) Splitting of
water is an important event in photosynthesis as
(i)It
releases molecular oxygen as byproduct of photosynthesis and is the significant
source of oxygen in air, or is essential for all living beings on earth.
(ii) Hydrogen
ions produced, are utilised in reducing NADP to NADPH, a strong reducing agent.
(iii) The
electrons released are transferred from PS II to PS I through a series of electron
carriers thus, creating a gradient for the synthesis of ATR
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