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Iris is found in which layer of the eyeball?

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Iris is found in which layer of the eyeball?

(a) Vascular tunic

(b) Retina

(c) Fibrous tunic

(d) Microtubules

I have been asked this question by my school teacher while I was bunking the class.

My question is based upon Sensory Organs in chapter Human Physiology of Life Sciences

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Correct option is (a) Vascular tunic

The best I can explain: Eyeball is made up of three layers, i.e., fibrous tunic, vascular tunic, and retina. The middle layer of the eyeball is a vascular tunic. It consists of three parts: ciliary body, iris, and choroid.

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