Chapter 17, Problem 7STP

Summary Introduction

Introduction:

The evidences that support evolution are comparative morphology, anatomy and embryology, paleontology, geographical distribution, taxonomy, connecting links, cytology, biochemistry, physiology and genetics. Morphological and anatomical evidences include related organ systems, homology, analogy, adaptive radiation, adaptive convergence, vestigial organs and atavism.

Answer to Problem 7STP

Correct answer:

Option (A), human appendix.

Explanation of Solution

Explanation correct answer:

Option (A): Human appendix is a muscular structure attached to the large intestine. It is tube like structure which is about 80-90 mm in length. It resembles worm. In human, it is vestigial organ.

Explanation incorrect answer:

Option (B): Deer horns. They are not vestigial as they act as defending organs for protection. Hence, this option is incorrect.

Option (C): Multiple cow stomachs. The multiple stomachs in cow are not vestigial as they all perform their different functions such as rumen and reticulum stores the food. The omasum and abosum are parts where food gets digested. Hence, this option is incorrect.

Option (D): Snake tail. Snakes use their tails to attack pray and snakes use their tails in defense against predators. Hence, this option is incorrect.