Given below is a table listing selected extant molluscs (Column X) and a range of eye complexities (Column Y) found in them.Column XColumn YA. Limpeti. Complex camera lens-type eyeB. Marine snailii. EyecupC. Nautilusiii. Eye with primitive lensD. Squidiv. Patch of pigmented cellsv. Simple pinhole eyeWhich one of the following options represents the correct match between Column X and Column Y?

Correct option is B

Explanation:

The question involves matching molluscs (Column X) with their respective eye structures (Column Y). Let's break down the correct matches based on the correct answer provided:

A. Limpet: Limpets are simple gastropod molluscs. They typically have very basic eye structures, often just a patch of pigmented cells (iv) that can detect light but lack advanced features like lenses or focusing mechanisms.

B. Marine snail: have eyes with a primitive lens. These eyes have a simple lens structure, allowing them to focus light and form basic images, but they lack the complexity seen in higher organisms. Thus, B – iii (Marine snail – Eye with primitive lens) is correct.

C. Nautilus: The nautilus, a cephalopod mollusc, has a unique eye structure known as a simple pinhole eye (v). It lacks a lens but uses a small opening to allow light in, functioning like a pinhole camera.

D. Squid: Squids, also cephalopods, possess highly advanced eyes similar to those of vertebrates, known as complex camera lens-type eyes (i). These eyes have lenses, retinas, and sophisticated focusing abilities.

A–iv, B–v, C–ii, D–i

A–iv, B–iii, C–v, D–i

A–ii, B–i, C–v, D–iii

A–v, B–ii, C–i, D–iii

Correct option is B

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Column X	Column Y
A. Limpet	i. Complex camera lens-type eye
B. Marine snail	ii. Eyecup
C. Nautilus	iii. Eye with primitive lens
D. Squid	iv. Patch of pigmented cells
	v. Simple pinhole eye