Biology Illinois Edition (Glencoe Science)
Biology Illinois Edition (Glencoe Science)
7th Edition
ISBN: 9780078759864
Author: Alton Biggs
Publisher: MCG
bartleby

Videos

Question
Book Icon
Chapter 33, Problem 21A
Summary Introduction

Introduction:

Eyes help us to see things. Eyesight provides a person able to see. The outer light travels through a transparent cell called the cornea. The cornea focuses the light through an opening called the pupil. The pupil is functioned by muscles in the eyes called iris. The retina is present after the iris which projects the image onto the retina. The retina has photoreceptors called rods and cones. Rods are the reasons for the vision of dim lights whereas cones are responsible for the vision of bright lights.

Expert Solution & Answer
Check Mark

Answer to Problem 21A

Correct answer:

The correct answer is option (a) rods.

Explanation of Solution

Explanation/justification for the correct answer:

Option (a) rods. Eyesight contains two types of photoreceptors. They are rods and cones. Rods are responsible for the vision of dim light. So, in a movie theatre where only a few dim emergency lights emerge, rods can help in finding the way to exit. Therefore, the correct answer is option (a).

Explanation for incorrect answer:

Option (b) cones. Cones receive bright light. As in a movie theatre where only the dim light emerges, cones adapt the vision of bright light. So, this is an incorrect option.

Option (c) Rods and cones are equally important. Rods are responsible for dim light vision, whereas cones are responsible for bright light vision. So in the situation mentioned above where only dim light emerges, rods will be most important for finding the way to exit. So, this is an incorrect answer.

Knowledge Booster
Background pattern image
Biology
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Text book image
Human Anatomy & Physiology (11th Edition)
Biology
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:PEARSON
Text book image
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Text book image
Anatomy & Physiology
Biology
ISBN:9781259398629
Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:Mcgraw Hill Education,
Text book image
Molecular Biology of the Cell (Sixth Edition)
Biology
ISBN:9780815344322
Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter
Publisher:W. W. Norton & Company
Text book image
Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:9781260159363
Author:Martin, Terry R., Prentice-craver, Cynthia
Publisher:McGraw-Hill Publishing Co.
Text book image
Inquiry Into Life (16th Edition)
Biology
ISBN:9781260231700
Author:Sylvia S. Mader, Michael Windelspecht
Publisher:McGraw Hill Education
Visual Perception – How It Works; Author: simpleshow foundation;https://www.youtube.com/watch?v=DU3IiqUWGcU;License: Standard youtube license