Where is NADP reductase enzyme located in the chloroplast ? What is the role of this enzyme in proton gradient development ?

Explanation

**Step-by-Step Solution:**

1. **Location of NADP Reductase in Chloroplast:**
- The NADP reductase enzyme is located on the outer side of the thylakoid membrane in the chloroplast. Specifically, it is found on the outer side of the thylakoid lamella.

2. **Role of NADP Reductase in Proton Gradient Development:**
- The primary role of NADP reductase in the context of proton gradient development is to facilitate the reduction of NADP+ to NADPH. This process involves the utilization of electrons that are transferred through the electron transport chain during photosynthesis.
- As NADP reductase catalyzes this reaction, it helps in the dissipation of the proton gradient that has been established across the thylakoid membrane. The energy released from the breakdown of this gradient is used to convert NADP+ into NADPH, which is essential for the Calvin cycle and other biosynthetic processes.