Pick the Best Choice by Estimating

question 171

Multiple Choice

Pick the best choice by estimating. Do not measure. For metric measurements, do not attempt to convert to the U.S. system. The hardest part of the transition to the metric system is the transition to thinking in metrics. An adult's height is most likely to be about __________.

• A) 5 cm
• B) 170 cm
• C) 40 m
• D) 40 cm
• E) 5 m

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Definitions:

Iris

The colored part of the eye that controls the size of the pupil and the amount of light that enters the eye.

Refraction

The bending of light as it passes from one medium to another with a different density, affecting its speed and direction.

Rhodopsin

A light-sensitive receptor protein involved in visual phototransduction in the retina of the eye.

Visual Pigment

Photoreceptive molecules in the retina that absorb light and trigger nerve impulses that result in vision.