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True or False Quiz #5

#1. Every cell in the body gets blood from the heart, except for the corneas.

Because transparency is of prime importance the cornea does not have blood vessels; it receives nutrients via diffusion from the tear fluid at the outside and the aqueous humour at the inside and also from neurotrophins supplied by nerve fibers that innervate it.

#2. A duck’s quack does not echo.

A duck’s quack not echoing is a myth that stems from the fact that it is simply very difficult to hear the echo. A reverberation chamber helps amplify echoes by giving sounds large reflective surfaces for the sound to bounce back on or echo off of. Using a reverberation chamber and waiting for a good quack is all you need to do to prove that a duck’s quack does indeed echo. But why is it so hard to hear a duck’s quack echo without this chamber?

Many reasons can contribute to creating an echo in the wild. A duck needs to have a large surface far enough away to reflect off of and the strength behind its quack to reach said surface and make it back to your ears at a volume that is loud enough for our ears to hear. A sudden change in volume is easier to hear than the way that a duck quacks – a fading in of volume and fading out of volume over the entire sound.

#3. "Dreamt" is the only English word that ends with the letters "mt".

#4. Brain uses 20% of oxygen breathed.

Although the brain accounts for only 2% of the whole body’s mass, it uses 20% of all the oxygen we breathe. A continuous supply of oxygen is necessary for survival. A loss of oxygen for 10 minutes can result in significant neural damage.

#5. Ostriches stick their heads into the ground when threatened.

Contrary to the popular myth, Ostriches don’t stick their heads to the ground when they feel threatened. Their first instinct is to run, and they are fast! Ostriches can outrun most predators that they encounter in the wild. Their top speeds reach 43 miles per hour! If they can’t run, they aren’t afraid to fight. An ostrich can kick with their clawed feet so hard they can easily take out a full-grown lion.

However, this myth did have an origin in ostrich behavior. Ostriches will lay down flat to play dead if they feel they can’t win the fight, this combined with their lightly colored head and neck makes it look as if they ostrich has buried its head into the earth.

#6. The dog star is the brightest star in the night sky.

The dog star, or Sirius, is the brightest star in the night sky. Sirius comes from the Greek word Seirius, meaning, “searing” or “scorching, which is fitting as Sirius is so bright in the northern hemisphere! It is twice as bright as the next brightest star, Canopus.

#7. An apple a day keeps the doctor away.

Apples are packed with vitamin C and fiber, both of which are important to long-term health, but they aren’t all you need. And if certain viruses or bacteria get into your system, an apple will unfortunately do nothing to protect you.

So go ahead and get that flu shot, even if you eat apples.

#8. A snow leopard's roar can be heard for miles.

It’s not true. Unlike other big cats, snow leopards can’t roar. Snow leopards have a ‘main’ call described as a ‘piercing yowl’.

#9. India is the country with the least number of wild tigers.

Not true. India is the country with the largest number of wild tigers. Around 3,000 of the world’s wild tigers are in our country.

#10. Reptiles don't yawn.

Yawning is an age-old activity that occurs in mammals, birds and, of course, reptiles. This behavior is controlled by chemicals in the brain called neurotransmitters. Neurotransmitters, such as nitric oxide and dopamine, act in the hypothalamus to induce and control yawning.
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