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Question

Which pigment helps some nocturnal animal to see at night?

A
Haemoglobin
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B
Porphyrin
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C
Guanine
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D
Heparin
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Solution

The correct option is C Guanine
Among many nocturnal vertebrates, the white compound guanine is found in the epithelium or retina of the eye. This provides a mirror-like surface, the tapetum lucidum, which reflects light outward and thereby allows a second chance for its absorption by visual pigments at very low light intensities at night. Tapeta lucida produces the familiar eyeshine of nocturnal animals.

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