New York State Chemistry RegentsNew York State Earth Science Regents

 
Human Impact on the Environment
Living Environment Regents August 2008 Question 24 PDF Print E-mail
Friday, 24 April 2009 04:52

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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 2008 Question 29 PDF Print E-mail
Friday, 24 April 2009 10:07

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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 56 PDF Print E-mail
Friday, 24 April 2009 11:33

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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 57 PDF Print E-mail
Friday, 24 April 2009 11:35
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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 58 PDF Print E-mail
Friday, 24 April 2009 11:37

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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 64 PDF Print E-mail
Saturday, 25 April 2009 04:58

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.

 


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