$2H_{2}O\to 2H^{+}+O_2+4e^{-}+H^{+}$

What is the significance of above reaction?

$3{\mathrm{CO}}_2+9 \mathrm{ATP}+6 \mathrm{NADPH}+Water\to glyceraldehyde-3-phosphate+9 \mathrm{ADP}+6 {\mathrm{NADP}}^{+}+8\mathrm{Pi}$

How many molecules of ATP & NADPH are required to fix one molecule of CO₂ in the above reaction?

$3{\mathrm{CO}}_2+9 \mathrm{ATP}+6 \mathrm{NADPH}+Water\to glyceraldehyde3-phosphate+9 \mathrm{ADP}+6 {\mathrm{NADP}}^{+}+8\mathrm{Pi}$

Where in the chloroplast does this process occur?

Explain the term Hatch slack pathway, associated with the ${\mathrm{C}}_4$ cycle.