Home Physics Ray Optics Human Eye and Lens Camera Substance on the choroid is
Physics Ray Optics Human Eye and Lens Camera Single Correct MCQ
Published on: September 12, 2026

Substance on the choroid is

A
Japan black
B
Nigrim pigment
C
Carbon black
D
Platinum black

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Verified by Experts
The correct answer is:
B
The choroid is a layer of the eye located between the retina and the sclera, and it contains pigmented cells that help absorb stray light. The pigment responsible for this in humans and many animals is known as 'nigrim pigment,' which is primarily composed of melanin.

Option A (Japan black) is a type of pigment used in art and is not associated with the choroid.
Option C (Carbon black) is a form of black pigment used in various applications but not specifically in the choroid.
Option D (Platinum black) is another form of pigment used in different contexts.
Therefore, the correct option is B: Nigrim pigment.

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