St. Elizabeth Ann Seton - Wichita, KS

DSWO WEEK 19 2019

DSWO WEEK 19

 

1-14  Life – Biology -  compare/contrast

What is the difference between identical and fraternal twins?

 

1-15  Life – Psychology – hypothesizing

For the most part, the left half of the brain controls the right half of the body, and the right half of the brain controls the left half of the body.  How do you think this connection was discovered?

 

1-16  Life – Biology- inferring

Which appeared first on earth, plants or animals?  Give reasons for your answer.

 

1-17  Physical – Chemistry – hypothesizing

Imagine you’re preparing a fresh fruit salad for a party.  How can you keep the apple and banana slices in the salad from turning brown?

 

 

ANSWERS:

1-14  Identical twins have the exact same genes.  They develop from the same fertilized egg, which means they look identical and are the same sex.  Fraternal twins come from 2 different eggs, so they do not necessarily look the same and may be of different sexes. 

 

1-15  Psychologists and physicians have been able to examine persons who have suffered damage to specific parts of their brains.  For instance, when a person has a blood clot in the brain, a part of the brain may stop functioning because of insufficient blood flow.  This event is called a stroke.  Many stroke victims lose the use of a hand or arm, or even an entire side of the body.  Autopsies of stroke victims reveal damage to the side of the brain opposite the disabled part of the body.

 

1-16  A plant is the earliest form of life found thus far by scientists.  In a remote part of western Australia, scientists have found what appear to be nearly the oldest known rocks on earth.  These rocks are about 3.5 billion years old.  They are called stromatolites and contain the fossilized remains of at least 5 different life forms.  The fossils appear to have been formed by pond scum, which used carbon dioxide (as plants do today) and grew in tiny strands. 

 

1-17 You can dip the slices in water, sprinkle them with lemon juice, or put them in an airtight container.  These techniques prevent oxygen from reacting with the molecules in the fruit.  When oxygen comes into contact with the exposed flesh of some fruits, a series of chemical reactions begins.  These reactions create the brown pigment that covers the exposed part of the fruit.  Water coats the surface of the fruit to prevent oxygen from reaching it for a while.  The vitamin C in lemon juice bonds with the oxygen to prevent it from reacting with the molecules of the fruit.  An airtight container prevents oxygen from reaching the fruit as well.

 

 

DSWO WEEK 17 2019

DSWO WEEK 17

 

1-3  Physical – Physics – compare/contrast

How are a laser beam and a flashlight beam alike and different?

 

1-4  Life – Disease – cause/effect

How does a vaccination help a person stay healthy?

 

ANSWERS:

 

1-3  Both kinds of light are made up of tiny energy particles called photons.  Photons vibrate in waves to produce light.  In a flashlight beam, the photons separate apart, which is why a beam of light gets wider and eventually fades away as it gets farther from the flashlight.  A laser concentrates a beam of light so that the photons are all in a single straight line, vibrating in the same way.  This makes the laser beam very strong and able to travel a long distance without fading.  A laser is so strong that it can be used to cut metal of even diamonds.  Lasers are also used for some kinds of medical surgery.

 

1-4  Vaccination shots give immunity, or protection, from certain diseases.  A vaccination shot puts in the person’s body a preparation of the same bacteria or viruses’ that cause the disease that the vaccination protects against. The bacteria or viruses in the vaccine are very weal, or even dead.  However, the body of the person who has had the shot makes antibodies that fight that particular kind of bacteria or viruses.  This means that if a person is exposed to that particular disease, the body already has built up antibodies to fight the disease.

DSWO WEEK 18 2019

 

DSWO WEEK 18

 

1-7  Earth – Geology – interpreting data

 

Why is a grain of sand in the desert usually rounder than a grain of sand in the ocean?

 

1-8  Life – Oceanography – hypothesizing

Most species of shark eat mainly fish.  Why might some sharks occasionally attack people?

 

1-9  Earth – Meteorology – cause/effect

What causes lightning? Does lightning always go from the sky to the ground?

 

1-10  Physical – Physics – measuring

Volume is the amount of space a substance occupies.  Why is it that equal volumes of different substances can have different weights? 

 

ANSWERS:

 

1-7  A grain of sand in the desert is usually rounder than a grain of sand in the ocean because in the desert the grains constantly rub against each other.  This happens in the ocean too but there the grains are cushioned by the surrounding water. 

 

*Sand is made of tiny particles of quartz or other minerals.

   

1-8  A few sharks, such as the tiger shark, eat large marine animals such as seals or sea turtles.  The tiger shark might attack a surfer because from below, with the surfer’s arms and legs extending from the board, the surfer looks like a seal or a turtle.  Sometimes a shark attacks a swimmer or diver because the person is dragging a bleeding bait fish.  However; such attacks are rare.  There are about 370 known species of shark.  Three species, including the largest, the whale shark, eat plankton, tiny plants and animals that drift in the ocean.

 

1-9  Electrical energy builds up in a thundercloud because strong air currents rise and fall next to each other.  Large drops of rain in the falling air smash into smaller drops in the rising air, and the falling drops strip electrons from the rising drops.  When the difference in electrical charge is strong enough, electrical energy is released, resulting in lightning.  The flash may go from the sky to the ground; from the ground to the sky (forked lightning), or between clouds (sheet lightning).

 

1-10  Objects with the same volume have different weights if they have different densities.  The heavier the molecules in a substance and the more closely packed they are, the greater the density.  A sample of gold, for example, weighs more than 7 times as much as a sample of aluminum of the same volume.