The Science Behind Sight

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What is the meaning of the word luminous as it is used in the selection "The Science Behind Sight"?

• things that are clear
• things that give off light
• things that reflect
• things that are opaque

What are some things that can be described as transparent as it is used in the passage? CHOOSE TWO

• windows
• a wooden door
• clear glass
• black fabric

PART A: Based on the information in the selection, the reader can conclude that the author thinks that

• sight is not an important sense
• sight is unnecessary
• we cannot understand how sight works
• sight is an important sense

PART B: Which sentence from the selection supports your answer to PART A above?

• "It helps us to read, play, learn, watch things, and more."
• "We can see when it is light, but it is hard to see well in the dark."
• "We have five senses to help us understand our world - sight, smell, touch, hearing, and taste."
• "We use light from lamps to see when it is dark."

On page 112 of the selection "The Science Behind Sight" the most likely reason the author includes the illustration of the boy sitting at his computer is

• to illustrate how we see things
• to demonstrate how to use a computer
• to explain how a lamp works
• to show us how to type

In the selection "The Science Behind Sight" which detail supports the key idea that the size of the pupil changes depending on the amount of light in the area?

• "It reflects light back onto the retina."
• "To let more light into your room, you open the curtains wide."
• "When it is nearly dark, cats' pupils open very wide to let as much light in as possible."
• "That is why cats and some other animals can see better in low light than we can."

Look at the section "Messages to the Brain" The author presents the ideas using sequential order most likely to

• describe the images the brain sees
• explain how the retina sends messages to the brain
• compare the retina and the brain
• show an example of how the brain words

Look at the pictures at the bottom of page 116 and 117. What is the most likely reason the author includes both "field of vison" illustrations?

• to compare the field of vision of animals that have eyes at the front and and animals that have eyes at the side.
• to illustrate how lions and water buffalo run.
• to demonstrate how lions see.
• to demonstrate how water buffalo see.

How does having eyes of the sides of their head benefit certain animals? Support your answer with evidence from the text.

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