Q. Oxygen which is liberated during photosynthesis, comes from

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A

$C O_{2}$

B

$H_{2} O$

C

chlorophyll

D

phosphoglyceric acid

Solution:

Oxygen, which is liberated during photosynthesis comes from $H_{2} O . C O_{2}$ , reduced to form carbohydrate during photosynthesis.
Chlorophyll is ' $M g$ ' containing green pigment which helps in photosynthesis.
Phosphoglyceric acid is the first stable product of photosynthesis in $C_{3}$ plants.
$4 H_{2} O ⇌ 4 H^{+} + 4 O H^{-}$
$4 O H^{-} Mn X^{+}, Cl X^{-} 2 H_{2} O + O_{2} ↑ + 4 e^{-}$