Central Idea Practice

What is the central idea?
 There are many types of lethal venom in the animal kingdom, but perhaps no stranger carrier than the platypus. The platypus is one of few venomous mammals.  Males carry a venom cocktail in their ankle spurs that incapacitates victims with excruciating pain.  Stranger still, the platypus is the only mammal that uses electroreception.  What this means is that the platypus uses its bill to sense the electricity produced by the muscular movements of its prey.  The platypus neither sees, hears, nor smells its prey while hunting but, rather, pursues it through electroreception.  Perhaps most odd, the platypus is the only mammal that lays eggs rather than giving birth to live young.  The platypus is an odd creature indeed.  

• The platypus is an odd, poisonous creature.
• Platypus males have a poison ankle spur.
• Platypus can sense electricity
• None of these options

Tags

CCSS.RI.4.1

CCSS.RI.4.2

Most people think that Johann Sebastian Bach played the piano, but this is not true. The piano was not invented until just two years before he died. Bach's main instrument was the organ. He was a great organist. He wrote a lot of wonderful music for that instrument. He also played other keyboard instruments that were ancestors of the piano. Among these instruments was the harpsichord. Along with Mozart, Bach is considered to be one of the all-time great composers
What is the main idea of this paragraph?

• Mozart and Bach did not compose music for the piano.
• Johann Sebastian Bach was a great organist and writer.
• The piano had not been invented three hundred years ago.
• The harpsichord was a keyboard instrument before the piano.

Tags

CCSS.RI.4.2

What is the Central Idea of the passage?
What's that humming sound?  Could it be hummingbird, the only bird capable of backward flight?  Hummingbirds have many unique flight habits that distinguish them from other birds.  Most birds flap their wings up and down to fly, but the hummingbird moves its wings forward and backward very rapidly in a figure eight pattern.  This allows the hummingbird to hover in position, fly upside down, and move about very rapidly.  And while other birds have to push off with their feet to begin flying, and work their ways up to their top speeds, the hummingbird can both start flying at maximum speed and stop flying instantaneously.  After you've seen a hummingbird in flight, it's unlikely that you'll mistake them for another bird.

• Birds and hummingbirds are very different.
• Hummingbirds make a humming sound.
• Hummingbirds wings fly in figure eight patterns.
• The hummingbird flys in a totally unique and unusual way.

Tags

CCSS.RI.4.1

CCSS.RI.4.2

Every year hungry deer do millions of dollars' worth of damage to young pine trees. Scientists in Washington have found a way to protect the trees. They use a substance called selenium. Selenium produces a bad smell when dissolved. A bit of this element is put in the ground near trees. Rain dissolves the selenium, and the trees absorb it. The bad smell keeps the deer away until the trees are fully grown.

• Deer damage trees every year
• Selenium in an important mineral
• How we can protect trees from deer
• Why deer eat pine trees

Tags

CCSS.RI.4.1

CCSS.RI.4.2

CCSS.RI.4.3

CCSS.RI.4.8

The peanut is a humble plant with hundreds of functions. Most peanuts are roasted in their shells and lightly salted. About half the peanuts eaten in the United States are ground into a thick paste called peanut butter. The rich oil made from peanuts is good for frying foods and is used for oiling machines and making soaps and paint. Even peanut shells are used to make plastics and to fertilize soil.

• Why peanut oil is used for frying
• Why peanut shells make good fertilizer
• How peanut butter is made
• The many uses of the peanut

Tags

CCSS.RI.4.1

CCSS.RI.4.2

School uniforms are far cheaper than the currently popular fashions. Many students work long hours at a paying job instead of doing homework because they feel they have to "keep up appearances." If students wore uniforms, there would be no need for most of them to have jobs that take away from their study time.

This passage is mostly about?

• popular fashions being expensive
• school uniforms being a good idea.
• students working many hours at jobs.
• teens enjoying wearing uniforms.

Tags

CCSS.RI.4.1

CCSS.RI.4.2

CCSS.RI.4.8

It's no surprise that exercise increases energy. The physical challenge prepares your body in a variety of ways. Blood sugar is more quickly converted to fuel, more oxygen is supplied to your cells, and fight-or-flight hormones are released. Instead of leaving you exhausted, exercise energizes. Do it in the morning for an all-day high or later in the afternoon for a pick-me-up.

This passage is mostly about?

• Exercise increases your energy.
• Exercise is easier than it looks.
• Everyone should exercise daily.
• Exercise makes you live longer.

Tags

CCSS.RI.4.1

CCSS.RI.4.2

CCSS.RI.4.8

Find the central idea
 Being a clown isn't all fun and games.  Rodeo clowns expose themselves to great danger every time they perform.  When cowboys dismount or are bucked off of bulls at riding competitions, rodeo clowns jump in front of the bulls and motion wildly to get their attention.  In this way rodeo clowns provide an alternate target, and in doing so protect the rider.  So you see, sometimes clowning around can be serious business

• Being a clown isn't all fun and games.
• Rodeo clowns protect cowboys by putting themselves in danger.
• Rodeos are exciting.
• Clowns are good at riding bulls.

Tags

CCSS.RI.4.1

CCSS.RI.4.2

Do you ever wonder how you taste things? You owe your sense of taste to your taste buds. We have 9,000 taste buds just on the tongue alone. There are also taste buds on the roof of your mouth. You even have taste buds on the back of your throat.

What does the author want you to learn about the passage?

• Why we can taste only sweet things.

• that we taste through our nose

• Taste buds are found in different places.

Tags

CCSS.RI.4.1

CCSS.RI.4.2

Because lambs are sometimes eaten by coyotes, ranchers may hunt or trap the coyotes. However, killing coyotes may upset nature's balance. Scientists have found a way to protect sheep without killing coyotes. Coyotes are fed lamb meat treated with a drug. When they eat the meat, they get sick. Later, coyotes won't even go near lambs. They'll hunt rabbits instead.

This story mainly tells.....

• Coyotes prefer rabbits to lambs.

• Killing coyotes upsets nature's balance.

• Scientists are trying to protect sheep and coyotes.

Tags

CCSS.RI.4.1

CCSS.RI.4.2