New York State Chemistry RegentsNew York State Earth Science Regents

 
Ecology
Living Environment Regents August 2008 Question 60 PDF Print E-mail
NYS Living Environment Regents August 2008

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Killing Mountain Lion lead to fewer cattle being killed.

But, this lead to an increase in the population of Deer and Rabbits which had fewer predators now and in turn caused the grain crops decreased.

 
Living Environment Regents August 2008 Question 59 PDF Print E-mail
NYS Living Environment Regents August 2008

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Populations of two specific animals that most likely increased are Rabbit and Deer

The reason behind the increase in the population of these animals in the food web is that they had fewer predators(Mountain Lions).

 
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 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 46 PDF Print E-mail
NYS Living Environment Regents August 2008
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Decomposers recycle nutrients and convert them to a form which can be easily absorbed by producer (plants). Plants use the nutrients and are consumed by primary consumers. These in turn are consumed by secondary consumer (predators).  When these animals die, the nutrients are recycled by decomposers to ensure the flow of nutrients in the ecosystem.
 
Living Environment Regents August 2008 Question 34 PDF Print E-mail
NYS Living Environment Regents August 2008

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Correct Answer – Option 4 – a population at equilibrium

The graph in the portion labeled A is representing constant population following a sinusoidal curve providing the inference that the population is in equilibrium. Hence, option 1 is correct.

The graph has no information about biodiversity or nutritional relationship of the fish population. Hence, the interpretations in options 1 and 2 are incorrect.

At no point other than the start the graph becomes 0. Hence, the interpretation that the portion of the graph labeled A represents a population becoming extinct is incorrect.

 
Living Environment Regents August 2008 Question 32 PDF Print E-mail
NYS Living Environment Regents August 2008

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Correct Answer – Option 1 – An increasing food supply from day 5 to day 6

According to the graph, the predator population is not equal in size to the prey population from day 5 to day 6. Hence, option 2 is incorrect.

The decrease in prey population is from day 0 to day 2 and again from day 6 to day 10. Hence, option 3 is not the most relevant interpretation of the graph.

Yeast does not become extinct on day 3. Hence, option 4 is incorrect.

Hence, option 1 is the correct interpretation of the graph.

 
Living Environment Regents August 2008 Question 30 PDF Print E-mail
NYS Living Environment Regents August 2008

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Correct Answer – Option 4 – the loss of biodiversity

Deforestation of areas considered to be rich sources of genetic material cannot improve the quality of atmosphere, or cannot lead to maintenance of dynamic equilibrium nor lead to an increase in the rate of evolutionary change. Hence, options 1, 2 and 3 are incorrect.

Deforestation will definitely lead to loss of biodiversity. Hence, option 4 is the most apt answer.

 
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 28 PDF Print E-mail
NYS Living Environment Regents August 2008

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Correct Answer – Option 1 – The ecosystem will change until a new stable community is established

The tsunami affected the marine ecosystem hence, leading to change. This change will be in process until a new stable community will be established.

However, there is no assurance of continuation or extinction of ecological succession neither the extinction of organisms. Hence, options 2,3 and 4 are incorrect.

 
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