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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Like other nocturnal carnivores, the ferret shown in Figure 33.16 has light-reflecting material in its choroid. Explain why the presence of reflective material in this layer of the eye maximizes the degree to which light excites photoreceptors. Explain also why having reflective material in this- layer causes the perceived image to be somewhat blurry.

Summary Introduction

To explain: The presence of light-reflecting material in eyes of nocturnal carnivores maximizes the degree to which light excites photoreceptors and also causes the perceived image to be blurred.

Introduction: Nocturnal animals refer to animals that are awake and active during the night. They have good night vision, keen senses of smell, touch, and hearing. They consist of a layer of cells tapetum lucidum behind their retina. It reflects light back through the eye. This enables them to see in dim light or dark.

Explanation

Refer to Fig. 33.16, “Eyeshine of a black-footed ferret” in the textbook. Ferret is a nocturnal carnivore that has light reflecting material in its choroid. The layer in the eye consists of tapetum lucidum that is located just behind the retina. When light enters the eye, it hits the mirror-like tapetum lucidum and reflects back leading to eyeshine effect...

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