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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

An example of a digestive specialization is seen in:

a. the long intestines characteristic of herbivores.

b. the incisors being the dominant teeth in wolves.

c. the canine teeth being the dominant teeth in deer.

d. salivary lipase being made by humans.

e. cellulose being made by humans.

Summary Introduction

Introduction:

Based on the mode of survival, the basic vertebrate digestive system of the vertebrates undergoes a multitude of structural and functional variations. The forms of mouth, structures of teeth and jaws, and the functions of the esophagus, stomach, and cecum, and the length of the digestive tract are examples of the most common modifications. The vertebrates also show the presence of microorganisms in their digestive tracts that derive symbiotic relationship with the animal.

Explanation

The justification for the correct answer:

Option (a) states that an example of digestive specialization is seen in long intestine’s characteristic of herbivores. This is a correct statement. Length of the intestinal tract is also an important modification in the digestive tract of vertebrates in which the carnivores generally have a relatively short intestine compared to the herbivores having a long intestinal tract. Herbivores such as rabbits or horses have a long intestinal tract that modifies into the specialized into the esophagus, stomach, and cecum, or other structures that can store large volumes of plant material. The longer intestinal tract and greater storage capacity allow the herbivore to digest plant matter. Hence, option (a) is correct.

The justification for the incorrect answers:

Option (b) states that the incisors being the dominant teeth in wolves is an example of a digestive specialization. This is a wrong statement as carnivores such as wolves use long and sharp canines to pierce and kill their prey. The canines are the pointed teeth that are present at the sides of the incisors and are specialized for biting and piercing. So, it is an incorrect option.

Option (c) states that the canine teeth being the dominant teeth in deer is an example of a digestive specialization...

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