Photosynthesis Question 48
48. A photosynthesising plant is releasing $18 O$ more than the normal. The plant must have been supplied with
[1993]
(a) $O_3$
(b) $H_2 O$ with $18 O$
(c) $CO_2$ with $18 O$
(d) $C_6 H _{12} O_6$ with $18 O$
Show Answer
Answer : b
Hints & Solution
(b) The phenomenon of breaking up of water into hydrogen and oxygen in the illuminated chloroplasts is called photolysis. Oxygen comes from photolysis of water was verified by Ruben and Kamen (1941).
