Which one of the following equations suggests that O 2 released during photosynthesis comes from water?

Question

Which one of the following equations suggests that O 2 released during photosynthesis comes from water? (A) 6 CO 218+12 H 2 arrow 6 O 218+ C 6 H 12 O 6+6 H 2 O 18 (B) 6 CO 2+12 H 2 O 18 arrow 6 O 2+ C 6 H 12 O 6+6 H 2 O 18 (C) 6 CO 218+12 H 2 arrow 6 O 218+ C 6 H 12 O 6+6 H 2 O (D) 6 CO 2+12 H 2 O 18 arrow 6 O 218+ C 6 H 12 O 6+6 H 2 O

Tardigrade Admin · Accepted Answer

Ruben and Kamen (1941), while working on chlorella (unicellular green alga ) found that oxygen liberated during photosynthesis comes from water.
(i) When normal

H_{2} O

radioactive

C O_{2}

(i.e.

C O_{2}^{18}

) were used, normal

O_{2}

is evolved.

n C O_{2}^{18} + n H_{2} O Light Chlorophyll (C H_{2} O^{18})_{n} + n O_{2} ↑ (

normal

) + H_{2} O

(ii) When normal

C O_{2}

radioactive

H_{2} O (

i.e.

H_{2} O^{18})

were used, radioactive

O_{2} (

i.e.

O_{2}^{18})

is evolved.

n C O_{2} + n H_{2} O^{18} \to (C H_{2} O)_{n} + O_{2}^{18} ↑

(radioactive oxygen)

+ H_{2} O

Q. Which one of the following equations suggests that $O_{2}$ released during photosynthesis comes from water?

$6 C O_{2}^{18} + 12 H_{2} \to 6 O_{2}^{18} + C_{6} H_{12} O_{6} + 6 H_{2} O^{18}$

$6 C O_{2} + 12 H_{2} O^{18} \to 6 O_{2} + C_{6} H_{12} O_{6} + 6 H_{2} O^{18}$

$6 C O_{2}^{18} + 12 H_{2} \to 6 O_{2}^{18} + C_{6} H_{12} O_{6} + 6 H_{2} O$

$6 C O_{2} + 12 H_{2} O^{18} \to 6 O_{2}^{18} + C_{6} H_{12} O_{6} + 6 H_{2} O$

Q. Which one of the following equations suggests that O2​ released during photosynthesis comes from water?

6CO218​+12H2​→6O218​+C6​H12​O6​+6H2​O18

6CO2​+12H2​O18→6O2​+C6​H12​O6​+6H2​O18

6CO218​+12H2​→6O218​+C6​H12​O6​+6H2​O

6CO2​+12H2​O18→6O218​+C6​H12​O6​+6H2​O

Q. Which one of the following equations suggests that $O_{2}$ released during photosynthesis comes from water?

$6 C O_{2}^{18} + 12 H_{2} \to 6 O_{2}^{18} + C_{6} H_{12} O_{6} + 6 H_{2} O^{18}$

$6 C O_{2} + 12 H_{2} O^{18} \to 6 O_{2} + C_{6} H_{12} O_{6} + 6 H_{2} O^{18}$

$6 C O_{2}^{18} + 12 H_{2} \to 6 O_{2}^{18} + C_{6} H_{12} O_{6} + 6 H_{2} O$

$6 C O_{2} + 12 H_{2} O^{18} \to 6 O_{2}^{18} + C_{6} H_{12} O_{6} + 6 H_{2} O$