Wednesday, December 8, 2010
Read the article, Chernobyl’s effects linger on (http://news.bbc.co.uk/hi/english/sci/tech/newsid_743000/743879.stm) and answer these questions.
1. When was this article published?
On Wednesday, 10 May, 2000 this article was published.
2. Why will restrictions on some food continue in the United Kingdom and former Soviet Union for another 50 years?
Restrictions on some food continue in the UK and former Soviet Union for another 50 years because researchers have found that radioactivity levels are very high.
3. Where have high levels of radioactive caesium been measured?
High levels of the element caesium have been found in fish in Norway and Cumbria. Also in earthbound plants and lake water.
4. What happened to the levels of radioactive caesium during the first five years after the Chernobyl accident?
The caesium’s half-life rose during the first five years of Chernobyl.
5. Describe why levels of radioactive cesium are not decreasing anymore.
Radioactive caesium are no longer waning because the environment is not cleaning itself and the caesium is not totally immobilised.
6. Why is diffusion of radioactive cesium back into the environment occurring? Explain the physical principle behind this diffusion.
Radioactive caesium is spreading into the environment again because with chemical processes, there are usually back reactions. As Doctor Jim Smith says, a concentration gradient causes the diffusion to occur, which then causes the radioactivity, the water, and the soil balance, and then is sucked into the soil itself. When balance alters, the gradient levels out, and the alteration between take-up and release differs.
7. How long will the United Kingdom have to continue restrictions on sheep from the Cumbria region as a food item for humans?
The UK will have to further the restrictions on Cumbrian sheep as food for 10-15 years, which is much longer than they expected.
8. How long will forest berries, fungi, and fish from parts of the former Soviet Union remain restricted?
Forest berries, fungi, and fish from parts of the former Soviet Union will remain restricted for fifty years.
All rights reserved. Science NetLinks Student Sheets may be reproduced for educational purposes.Chernobyl’s Effects – E-Sheet Questions
Lesson Title: The Chernobyl Disaster Page 2 of 2
Now read Chernobyl Children Show DNA Changes http://news.bbc.co.uk/hi/english/sci/tech/newsid_1319000/1319386.st and answer these questions.
1. Who are the children that this article is about? To whom were they born?
The children this article is about are mutated children of Chernobyl. They were born to people who cleaned up the explosion.
2. What are “liquidators”?
Liquidators is a term used to refer to people of the clean up team for Chernobyl. The USSR gave the nickname to 800,000 people.
3. Why are scientists studying the children?
The scientists are studying the children because of their exposure to chemicals/waste.
4. What are the controls in this study?
The controls of this study are internal, the children of parents who were exposed to radioactivity, and external, the children of people who were not exposed.
5. Describe what scientists discovered about the children’s DNA.
Scientists found that children had unexpectedly high amount of mutations after 1986.
6. Describe the factors that may be linked to the number of DNA changes observed in children.
The factors that are connected to the number of DNA alterations are that their parents were expose to chemical debris.
Read Nuclear Energy Agency: Health Impact http://www.nea.fr/html/rp/chernobyl/c05.html and answer these questions.
1. Describe what happens to DNA, cells, and organs after low and high doses of radiation.
When DNA receives low doses of radiation it may be able to heal most of the cell, if it receives high doses then the DNA cell will most likely die. At low doses cells regenerate, but at high doses they will be destroyed and cause problems with organs.
2. Describe the acute health effects of the Chernobyl disaster.
Some acute health effects of Chernobyl disaster are immediate death from being hit by explosion, thermal burns, and coronary thrombosis. There were a total of 31 deaths post-accident. There were 499 people taken in for examination and 237 were quickly diagnosed with acute radiation syndrome.
3. Describe the chronic or late health effects of the Chernobyl disaster.
There were many diseases such as thyroid cancer that were found later on.
All rights reserved. Science NetLinks Student Sheets may be reproduced for educational purposes.
Thursday, October 28, 2010
Eco-cruise in the Galapagos. Web. 29 Oct 2010.
The Blue-footed Booby Bird
Tuesday, October 26, 2010
1. If being flashy and colorful attracts predators, why do you think guppies are so colorful?
Guppies are very colorful so they can attract female guppies and mate.
2. After viewing the guppy gallery, pick the fish you find most interesting. What is the fish’s scientific name, origin and average size? Describe the coloration of the fish you chose.
Common Name: Guppy or Millions Fish
Scientific: Poecilia reticulata
Ave. Size: 1.4" or 3.5 cm
Coloration: Navy blue base, mottled pink, orange, and green. It has a green fin and bright fanned out tail.
3. After viewing the predator gallery, pick the fish you find most interesting. What is the fish’s common name, scientific name, and origin?
Common Name: Pike cichild
Scientific: Crenicichla alta
Origin: Trinidad and Latin America
4. View the guppy’s habitats, what habitat conditions would affect the predator populations?
If the habitat is a deep stream, then the predator populations will be very high. In a small dam habitat, predator populations would be little to none because there would be no room for predator movement. In a medium-small dam there would be a bearable predator population because there would be more room for predators to move around. Only small predators such as the rivulus could prosper in a shallow stream habitat.
Endler’s Discovery and Variations of Guppy’s in Pools
5. Who is John Endler? What did he study and where did he study it?
John Endler is an evolutionary biologist who studied Trinidad's wild guppies, probably in Trinidad. He studied guppie distribution, size, color, and spot sizes.
6. For each of the three stream areas, describe the guppy coloration:
Pool 1: The average male coloration would be very bright with lots of colors and large spots. There were very few predators, so guppies are able to have as flamboyant colors as they want.
Pool 2: In this pool there is a moderate predator population, so the average color is medium on the body and tail with medium spots.
Pool 3: There is very dull coloration in the guppies here because there is a high predator population. This means the guppies need to keep the colors and vibrancy to a bare minimum.
7. Develop your own hypothesis about guppy coloration. The hypothesis should answer the questions: Why do guppies in different areas of the stream have difference in coloration? (You can choose from the list on the simulation, or make up your own)
If there is a higher predator population in one area, then the guppies need to have a drabber/duller coloration because they will be eaten if they stand out too much.
If there is a lower predator population in another area, then the guppies can have very bright colors because they won't be eaten as frequently.
If the predator population is medium then so is the guppy coloration because they may be eaten or they may not.
Guppy Simulation Summary
% of Brightest Guppies
|% of Bright Guppies |
|% of Drab Guppies |
|% of DrabbestGuppies |
Guppy: Even Mix
Guppy: Even Mix
Guppy: Even Mix
|23%||13% ||16%||48% |
Guppy: Mostly Bright
Guppy: Mostly Drab
8. Describe how predators influence guppy coloration.
Predators influence the guppy coloration by making it brighter or drabber. If the predator population is high, then the guppy coloration is dull. If the predator population is low, then the guppy coloration is vibrant.
9. Was your hypothesis correct, use your data to justify your answer.
Yes it was correct because the data showed exactly what we had predicted. The coloration of the guppies was brighter with a smaller predator population. The coloration was also duller with a higher predator population. Lastly, when there was an even predator/guppy population there was medium coloration.
10. What does it mean that “male guppies live in a crossfire between their enemies and their would be mates”?
It means that male guppies live in situations where certain things are conflicting. For example they can either have a good fitness by being very bright and mating. Or they can be very dull and be able to camouflage from their predators. They can have one or the other, not both. So to be able to mate they are in danger of being spotted and becoming prey. By being dull they are in danger of not attracting a mate.
11. Why do you think guppies in different areas of the stream have different coloration?
The higher predator population in one area, the guppies need to have a drabber/duller coloration because they will be eaten if they stand out too much. The lower predator population in another area, the guppies can have very bright colors because they won't be eaten as frequently. The predator population is medium then so is the guppy coloration because they may be eaten or they may not.
12. What would happen to mostly drab guppies that were placed in a stream with very few predators?
They probably would be overpopulated because they would not have a high chance of being eaten by a predator anyways since they are so drab, but now that there are so few predators there would be an abundance of drab guppies.
13. What would happen to brightly colored guppies that were placed in a stream with many predators?
Their population might diminish because their flamboyancy would attract predators, and since there are a lot of predators, there will be very few guppies. Since they will all be eaten.
Wednesday, October 6, 2010
Tuesday, September 21, 2010
If the alcohol evaporates well inside the bottle, then when it is ignited flame will light up inside the bottle because gas is flammable.
The bottle was coated well in the rubbing alcohol. Blue flame shot out of the bottle immediately when the lighter touched it. The momentum carried the bottle almost all the way to the wall.
Earth's greenhouse effect allows life to be sustained. The natural greenhouse effect goes like this: Greenhouse gases operate like a jar in the way that it partially contains the sun's heat energy and then lets it go into space. Thus allowing there to be life on Earth. Humanity is causing and creating more greenhouse gases to emanate which is causing temperatures to rise, resulting in climate change. This is also causing several problems such as the melting of glaciers, rising sea levels, suffering corals, etc.
If the vinegar-baking soda mixture evaporates into gas, then it will snuff out the candle flame because it has formed carbon-dioxide gas which extinguishes flame.
The vinegar and baking soda bubbled and fizzed on contact. Carbon dioxide gas produced from the graduated cylinder blew out the flame. In order for there to be fire, there must be oxygen. When the carbon dioxide gas goes near the flame it removes the oxygen, so then it
removes the flame as well.
Carbon dioxide is like one of those things that you can't live with or without.
It is needed for plants and is a natural component, but humans are now affecting the natural carbon cycle. Too much of anything is not good, no matter what it is. A lot of carbon dioxide is being released from the things humans do plus the normal amount and it adds up.
Hydrogen Gas Demo:
If the hydrogen evaporates into gas, then it will ignite because of the flammable gas.
When the zinc hit the hydrochloric acid it started sizzling. It immediately evaporated and the gas escaping at the top could be seen. All
the zinc evaporated and when it was ignited the gas lit into flames that soon died down. When the mixture was lit again it lit up but died down
very quickly. The beaker was still considerably warm even after the fire dissipated.
Hydrogen can be produced through steam reformations where carbon dioxide is released. It can also form through a process involving
Air pressure demo:
If the can is filled with water vapor and placed into the ice water tub, then it will
Water vapor rose from the can in wisps. The can was placed with the open side up into the water. There was not really a noticeable chemical
If the can is filled with water vapor and placed invertedly into the ice water tub, then it will be crushed because of the pressure and gas trapped in the can.
Bubbles formed when the can was being heated. Once the can was placed in the water it was crushed and when it was lifted water poured
out of the hole. A vacuum was created when the can was flipped and the air pressure was changed. The air needed to fill up the space.
The atmosphere circulation is controlled by air pressure. Alterations to the air pressure can impact the weather. Over the years air pressure has risen considerably which has and will lead to less cold, rainier, and windier winters in Northwest Europe. In southern Europe, however, winters will be much drier. Canada and the US can expect milder winters. Leaving Greenland with colder winters. These changes are not necessarily caused by combustion/greenhouse gases. Natural differences in the climate may be to blame this time.
Tuesday, August 31, 2010
2. Did the people know the dangers of running the tests on the reactor?
3. If the citizens send their children and themselves after theyare exposed to radiation, can't they pass it on to more people?
4. If the nuclear reactors powered 40% of the electricity, what will they use now?
5. If no facilities or waste water treatments exist, then are people just drinking the contaminated water?
6. Has the supersarcophagus been completed?
7. Is it spelled chernobyl or chornobyl?