New York State Chemistry RegentsNew York State Earth Science Regents

 
Human Impact on the Environment
Living Environment Regents August 2008 Question 64 PDF Print E-mail
NYS Living Environment Regents August 2008

image064Native fish will not have any negative effect on other species.

But, pesticides will not only kill the mosquitoes but also affect other species which may harm the ecosystem.

 
Living Environment Regents August 2008 Question 58 PDF Print E-mail
NYS Living Environment Regents August 2008

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The brown tree snakes eat birds’ eggs and reduce bird population in the ecosystem which leads to an imbalance in the ecosystem.

Zebra mussels may compete with the native species leading to decrease in number and finally extinction of the native species.

 
Living Environment Regents August 2008 Question 57 PDF Print E-mail
NYS Living Environment Regents August 2008
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An action government could take to prevent the introduction of additional new species is increasing public knowledge about the problem arising in the ecosystem by such activity and passing laws to stop introduction of new species which could lead to imbalances in existing ecosystems.
 
Living Environment Regents August 2008 Question 56 PDF Print E-mail
NYS Living Environment Regents August 2008

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One reason why an introduced species might be very successful in a new environment could be large food supply or lack of competition for food.

If the food required for the newly introduced species is abundant, it becomes easier for the species to survive and grow in the new ecosystem.

Also, lack of competition for food, due to no other species feeding on the food type required for the newly introduced species leads to the survival, reproduction and growth of this species in the new ecosystem.

 
Living Environment Regents August 2008 Question 29 PDF Print E-mail
NYS Living Environment Regents August 2008

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Correct Answer – Option 2 – recycling of nutrients

The mulching lawn movers cuts the grass clippings into very fine pieces and deposit them into soil do ensure decomposition and formation of nutrients to be utilized by the grass for growth. Hence, the recycling of nutrients takes place.

However this process does not ensure increasing the diversity of life, or control of pathogens or the production of new species. Hence, options 1,3 and 4 are incorrect.

 
Living Environment Regents August 2008 Question 24 PDF Print E-mail
NYS Living Environment Regents August 2008

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Correct Answer – Option 1 – Human actions are a threat to equilibrium in ecosystems.

The diagram above represents modifications of ecosystem by humans through the use of technology, consumption and population growth disrupting the equilibrium in ecosystems.

Hence, the options 2,3 and 4 are incorrect.

 
Living Environment Regents August 2010 Question 50 PDF Print E-mail
NYS Living Environment Regents August 2010
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Biofuels are carbon-neutral: the carbon dioxide released during combustion is initially extracted from the atmosphere during photosynthesis, thus there is zero net greenhouse gas emissions.

Biofuels also contributes to the reduction in the release of volatile organic compounds, as the addition of ethanol gasoline oxygenates the fuel mixture so it burns more completely. Ethanol also rids the use of harmful lead.

Since biofuels come from plants, they are biodegradable and non-toxic. Thus, biofuel spillages are not as harmful as fossil fuel spillages.

 
Living Environment Regents August 2010 Question 49 PDF Print E-mail
NYS Living Environment Regents August 2010
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Correct answer: Biofuel crops

Biofuels are alternative fuels that come from plants and plant-derived sources. Biofuels are usually used for transportation. One such of biofuel is called the bioethanol, which can be used as substitute for petrol. It is produced by fermenting cellulose from corn (maize) and sugar cane. Another type of biofuel is the biodiesel, which can be sourced from oil crops like rapeseed, palm, and soybean.

Biofuel crops are considered as a renewable source of energy because it can be easily replaced (by planting the crops) in a relatively short span of time.

 
Living Environment Regents August 2010 Question 42 PDF Print E-mail
NYS Living Environment Regents August 2010
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Correct answer: (4) an increased demand for land use

Among the choices given, this is the only possible result of increasing population. More population would mean more land to build houses on, more land to produce crops for food, and more land to build infrastructures necessary for producing materials for human use, such as clothing.

Incorrect answers:

(1) a decreased demand for deforestation

As population increases, more trees are necessary to produce paper, clothing, and other materials for human use that are made up of timber and its by-products.

(2) an increase in available fresh water

As population increases, more fresh water is needed for human consumption and other activities such as bathing, washing of clothes and dishes, etc.

(3) a decrease in air pollution

As population increases, more fuel is necessary for activities such as transportation and production. Thus, there will be more air pollution when the number of people increases.
 
Living Environment Regents August 2010 Question 38 PDF Print E-mail
NYS Living Environment Regents August 2010
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Correct answer: (2) Many people care more about their personal comforts than about the possible effects of global warming.

Based on the answers of the respondents, they were more concerned about personal matters such as taxes and gasoline expenses, than preventing global warming. For instance, the answer to the second question states that they prefer using big cars simple because they like it and they think it is safer for them. They do not consider the use car with better fuel economy to lessen the gas emissions that contribute to global warming.

Incorrect answers:

(1) Many people are very aware of the possible effects of global warming.

The answer to the last question clearly states that people are not informed about global warming. They do not know that the changes in climate are caused by several human activities and inventions.

(3) Many people are willing to sacrifice to reduce the possible effects of global warming.

This is not true based on the answers to the interview. They are more concerned about their taxes or gasoline expenses than contributing in the alleviation of climate change.

(4) Many people are now taking action to reduce the possible effects of global warming.

The interviewees are not doing anything to help reduce or prevent global warming.
 
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