Photosystem I is located predominantly in the _____?

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Photosystem I is located predominantly in the _____? Answer: Unstacked regions of the thylakoid membrane

Photosystem I (PS I) is primarily found in the unstacked regions (stroma lamellae) of the thylakoid membrane. This location allows it to efficiently transfer electrons to NADP⁺, forming NADPH, while Photosystem II is concentrated in stacked grana regions for optimal light harvesting.

Question context

This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.