Nokea
The Water Cycle
Water is needed to sustain practically all life functions on planet Earth. A single drop of this compound is composed of an oxygen atom that shares its electrons with each of the two hydrogen atoms.
The cycle starts when precipitation, such as rain, snow, sleet, or hail, descends from the sky onto the ground. Water that is not absorbed immediately from the precipitation is known as runoff. The runoff flows across the land and collects in groundwater reservoirs, rivers, streams, and oceans.
Evaporation takes place when liquid water changes into water vapor, which is a gas. Water vapor returns to the air from surface water and plants.
Ultimately, condensation happens when this water vapor cools and changes back into droplets of liquid. In fact, the puffy, cotton clouds that we observe are formed by condensation. When the clouds become heavily laden with liquid droplets, precipitation ensues.
According to the passage, which statement is false?
- A. Puffy, cotton clouds are the result of a heating process.
- B. The compound for a single drop of water is H2O.
- C. Lake water is produced as a result of the runoff.
- D. Water is an essential element for living things.
Correct Answer: A
Rationale: The passage explains that puffy, cotton clouds are formed by condensation, not by a heating process. Therefore, statement A is false. The other statements (B, C, and D) are true according to the information provided in the passage. The compound for a single drop of water is indeed H2O, runoff contributes to the production of lake water, and water is essential for living things as stated in the passage.
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About 6% of the earth is covered by rainforests. The largest rainforest in the world is the
Amazon Basin, which stretches over 2.3 million square miles in nine different South American countries. This area is double the length of all the other remaining rainforests in the world. Brazil contains 60%of the Amazonian rainforest, since it lies at the mouth of the river Amazon. This river is the second largest in the world and contains more than one-fifth of the world's fresh water. The Amazon rainforest is a type of wet broadleaf forest. The weather there is very humid and warm as it rains quite a bit. Because of the high rainfall, the forest is very rich and green. The
tree leaves are pointed and narrow so that the raindrops can easily drop off wet plants. This
tropical rainforest has more living species than the entire European continent. There are over 400 types of insects living in one single rain forest tree for a total of 2.5 million species. One square kilometer of rainforest may contain over 75,000 types of trees and approximately 438,000
different kinds of plants, which comes to a total of 90,000 tons of greenery overall. The Amazon rainforest is home to 2,000 birds and mammals, with one in every five birds in the world living there. Local farmers have lived off this rich and diverse land for thousands of years. They have been able to find food and water here without destroying the land. The Kayapo people of Brazil
farm in an environmentally-friendly way. Instead of chemicals, they use burned wood to enrich the soil, and plant banana trees, which attract wasps. These wasps then feed on leafcutter ants and get rid of these harmful insects. The rainforest also offers a lot of tropical fruits, such as bananas and coconuts, as food.
Cinnamon is made from the bark of a rainforest tree. Amazonian Indians use the fruit and stem
of the Buruti plant as a drink, to make bread and to build houses. Many other plants are used as medicine. But the Amazon rainforest is in very big danger of disappearing. 9,169 square miles of
forest have been cut down in 2003 in Brazil alone. An area of the size of a football field is burned down basically every minute, which means that the rain forest may be gone by the year 2030.The dangers related to this type of activity are obvious. Trees take in poisonous carbon
dioxide from the air and give off oxygen. There is more oxygen and less carbon dioxide around a
rainforest. When trees are cut down, however, the amount of carbon dioxide increases, and the
air gets warmer. This leads to global warming, which is extremely harmful to the environment. It
is estimated that the burning of Brazilian rainforests alone produces 200 million metric tons of carbon dioxide ayear. Another danger connected with destroying the rainforest is the disappearance of plants and animals. When trees are cut down, plants and animals have no more
food left and slowly die out. Killing wild animals is illegal in Brazil, but there is plenty of stealing going on. 38 million animals are stolen and sold illegally each year. The most hunted
animals are birds, especially parrots, followed by snakes and the jaguar.
Which rainforest plant has more than one use?
- A. The banana
- B. The coconut
- C. Cinnamon
- D. The Buriti plant
Correct Answer: D
Rationale: The correct answer is D, the Buriti plant. The passage mentions that Amazonian Indians use the fruit and stem of the Buriti plant as a drink, to make bread, and to build houses. This plant demonstrates multiple uses within the rainforest ecosystem, making it the plant with more than one use among the options provided.
People of Hispanic origin were on the North American continent centuries before settlers arrived
from Europe in the early 1600s and the thirteen colonies joined together to form the United
States in the late 1700s. The first census of the new nation was conducted in 1790, and counted about four million people, most of whom were white. Of the white citizens, more than 80%
traced their ancestry back to England. There were close to 700,000 slaves and about 60,000 "free Negroes". Only a few Native American Indians who paid taxes were included in the census count, but the total Native American population was probably about one million. By 1815, the population of the United States was 8.4 million. Over the next 100 years, the
country took in about 35 million immigrants, with the greatest numbers coming in the late 1800s and early 1900s. In 1882, 40,000 Chinese arrived, and between 1900 and 1907, there were more
than 30,000 Japanese immigrants. But by far, the largest numbers of the new immigrants were
from central, eastern, and southern Europe. An enormous amount of racial and ethnic assimilation has taken place in the United States. In 1908, play-write Israel Zangwill first used the term "melting pot" to describe the concept of a place where many races melted in a crucible and re-formed to populate a new land. Some years during the first two decades of the 20th century, there were as many as one million new
immigrants per year, an astonishing 1 percent of the total population of the United States.
In 1921, however, the country began to limit immigration, and the Immigration Act of 1924
virtually closed the door. The total number of immigrants admitted per year dropped from as many as a million to only 150,000. A quota system was established that specified the number of
immigrants that could come from each country. It heavily favored immigrants from northern and western Europe and severely limited everyone else. This system remained in effect until 1965, although after World War II, several exceptions were made to the quota system to allow in
groups of refugees.
In line 21, the term 'virtually' is closest in meaning to which of the following?
- A. effectively
- B. occasionally
- C. thoroughly
- D. undeservedly
Correct Answer: A
Rationale: The term 'virtually' is used to convey the idea that something is almost or nearly the case. In this context, it implies that the Immigration Act of 1924 came very close to completely closing the door on immigration. The most suitable synonym for 'virtually' in this context is 'effectively,' indicating that the act was highly efficient in achieving its goal of restricting immigration.
Linking San Francisco to Marin County in California, the Golden Gate Bridge is one of the most famous bridges in the world. The bridge crosses over a narrow strait which connects the Pacific Ocean to San Francisco Bay. Prior to the bridge, people traveled by ferry boat across the strait.
Although most people thought a bridge was necessary to expedite travel, some residents of the
bay area felt the risk of building the bridge was too great. Joseph Strauss believed that nothing was impossible, and dreams would never come to fruition if risks weren't taken. So, he decided to gather the best and brightest builders, architects, and workers to embark on the challenge of
building a bridge across the Golden Gate Strait. With safety nets in place, the construction began in 1937. Building the anchorages first, the
builders then move on to the towers on each end, and then to the three-foot thick cables to support the suspension bridge. Lastly, workers labored to complete the roadway which became
the most dangerous and treacherous part of the entire task. The builders had to keep the bridge
balance, so it wouldn't fall into the bay.
Today, over sixty-five years later, the bridge remains a life-line for the people of the San Francisco Bay Area.
Why was the roadway so dangerous to build?
- A. There weren't enough materials available to build the road.
- B. The workers might get hit by passing cars.
- C. The men would fall to their deaths.
- D. If the road wasn't balanced, it would collapse.
Correct Answer: D
Rationale: The roadway was so dangerous to build because if it wasn't balanced correctly, it would collapse. The text mentions that the builders had to keep the bridge balanced to prevent it from falling into the bay. This highlights the critical importance of ensuring the structural integrity and balance of the roadway to maintain the stability of the entire bridge. Therefore, any imbalance in the construction of the roadway could lead to a catastrophic failure of the bridge, making option D the correct answer.
Blood Pressure Regulators
The body is composed of systems that have evolved and diversified in order to maintain the natural functions and processes they regulate. One such system that has these regulators is the bodyĆ¢Ä‚¬Ä„¢s cardiovascular system. The bodyĆ¢Ä‚¬Ä„¢s pump, which regulates the flow of vitally needed oxygen to all cells of the body, as well as the discard of carbon dioxide and other waste products, is the heart.
Because blood pressure varies at different points within the body, differing components are needed to keep the bodyĆ¢Ä‚¬Ä„¢s blood pressure regulated. Three of the basic components are baroreceptors, chemoreceptors, and the kidneys.
Baroreceptors are stretch receptors composed of fine branching nerve endings and are contained along the walls of the arteries near the heart and in other areas of the body as well. Impulses are related to this stretching along the arterial walls, which causes these baroreceptors to send out even more impulses to the heart, arteries, and veins, causing the blood pressure to go either up or down.
Chemoreceptors are located along the walls of the arteries and monitor changes in oxygen level, carbon dioxide, and pH. Just think! A fall in oxygen causes receptors to send impulses to raise the blood pressure.
The kidneys play a role in regulating blood pressure by absorbing salts and water and removing wastes. Hormones secreted by the adrenal cortex cause the kidney to keep or let go of any salt and water. This has an influence on blood volume and consequently on blood pressure.
What is the primary purpose of the writer in this essay?
- A. To inform the reader about the dangers of high blood pressure
- B. To inform the reader how high blood pressure leads to a higher risk of heart attack
- C. To inform the reader how the cardiovascular system regulates blood pressure
- D. To persuade the reader that controlling one's blood pressure is important
Correct Answer: C
Rationale: The primary purpose of the writer in this essay is to inform the reader about how the cardiovascular system regulates blood pressure. The essay discusses the components involved in regulating blood pressure, such as baroreceptors, chemoreceptors, and the kidneys. It explains how these components work together to maintain blood pressure levels in the body. The essay does not focus on the dangers of high blood pressure, the relationship between high blood pressure and heart attacks, or persuading the reader to control their blood pressure. Therefore, option C is the correct answer.
Glass
I wonder who first discovered glass. This commodity has been a part of civilization from the very beginning. Imagine a world without glass! How dark and dismal it would be. No windows, corrective lenses, telescopes, microscopes, cameras, sparkly drinking containers or mirrors. Life would not be the same without this wonderful discovery. Thank you, whoever found glass!
Glass is not an element, but a combination of several elements. It is a hard, brittle, transparent solid material composed mainly of silica, with additives to change the character of the glass. Common additives are soda, lime, lead, and boron. Each additive changes the properties of the final product. Soda and lime are the most common additives, accounting for about 90% of glass production. Adding lead increases reflectivity, causing the glass to "sparkle." The addition of boron changes the thermal and electrical properties of glass, allowing cookware that can be used in the oven without shattering.
What is the definition of 'brittle'?
- A. Flexible and resilient
- B. Easily broken
- C. Hard and fragile
- D. Tough and sturdy
Correct Answer: B
Rationale: The correct definition of 'brittle' is being 'easily broken,' making choice B the correct answer. Brittle materials are prone to breaking, cracking, or shattering when subjected to stress or pressure. In the context of glass, being described as 'brittle' means that it can break easily without much deformation or flexibility, unlike materials that are tough or resilient. Therefore, understanding the properties of materials like glass, including its brittleness, is crucial in various applications and industries.