Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

An animal that navigates by the stars needs ________.

  1. a. an ability to sense Earth’s magnetic field
  2. b. pheromone receptors
  3. c. an internal clock
  4. d. an acute sense of hearing

Summary Introduction

Concept introduction: All the organisms can move from one place to another for the need of food or shelter. Some animals migrate to other places during the seasonal change toward a breeding site. This migration and the navigation of animals occur through the stimulus response. Animals use several navigation patterns to reach their new habitat.


Reasons for correct statement:

During migration, organisms interrupt their day-to-day activities and travel in a different manner to some distinct region.

Option c. is given as “an internal clock”. Certain animals can alsonavigate by sun and stars. The position of these cosmic bodies changes over time. Therefore, the use of sun- or star-based navigation requires distinctive sense of time. If the bird needs to fly toward the south, it must fly to the right of the sun in the morning and left of the sun in the evening. This movement that is directed by stars is done by the internal clock in the animals. Hence, option c. is correct answer.

Reasons for incorrect statements:

Option a. is given as “an ability to sense earth’s magnetic field”; the animals navigate using the variations in the magnetic field...

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