New York State Chemistry RegentsNew York State Earth Science Regents

 
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Living Environment Regents August 2008 Question 67 PDF Print E-mail
NYS Living Environment Regents August 2008
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Vaccination helps the white blood cells to produce antibodies for this particular disease and be prepared to prevent the attack by this virus in the future.
 
Living Environment Regents August 2008 Question 66 PDF Print E-mail
NYS Living Environment Regents August 2008
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The immune system is most directly affected by a vaccination. The immune system becomes prepared with the defense mechanism (antibodies for this virus) to prevent the disease from occurrence when there is a virus attack.
 
Living Environment Regents August 2008 Question 65 PDF Print E-mail
NYS Living Environment Regents August 2008
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Vaccine contains dead or weakened viruses or their products. This dead or weakened virus stimulates the white blood cells to produce antibodies for this specific type of virus, thus helping the body to be prepared with the defense mechanism against the disease that can be caused by a live or healthy virus.
 
Living Environment Regents August 2008 Question 42 PDF Print E-mail
NYS Living Environment Regents August 2008

image042Correct Answer – Option 2 – carbon dioxide

Plants absorb carbon dioxide to generate food and oxygen. Hence, option 2 is the correct answer.

Plants do not absorb dissolved nitrogen to generate oxygen. Hence, option 1 is incorrect.

Enzymes and hormones are not freely available in water. Hence, options 3 and 4 are incorrect.

 
Living Environment Regents August 2008 Question 41 PDF Print E-mail
NYS Living Environment Regents August 2008

image041Correct Answer – Option 1 – producing glucose

Plants use carbon dioxide and sun light, to break nutrients into simple sugars such as glucose for and in the process generate oxygen. The observation of bubbles of oxygen in the tube shows the production of glucose. Hence, option 1 is correct.

Plants do not make protein. Hence, option 2 is incorrect.

Plants do not release energy from water. Hence, option 3 is incorrect.

Active transport does not lead to the production of oxygen. Hence, option 4 is incorrect.

 
Living Environment Regents August 2008 Question 38 PDF Print E-mail
NYS Living Environment Regents August 2008

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Correct Answer – Option 3 – a feedback mechanism

The statement in the question describes circulation of message to generate reaction i.e. a feedback mechanism.

The reaction of the pituitary gland to release hormone 2 on drop of blood pressure and in reaction to this gland B is stimulated to increase blood pressure and this in turn leads to the reduction in the release of hormone 2. This mechanism does not take place by DNA base substitution, or manipulation of genetic instructions or an antigen-antibody reaction. Hence, options 1, 2 and 4 are incorrect.

 
Living Environment Regents August 2008 Question 37 PDF Print E-mail
NYS Living Environment Regents August 2008

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Correct Answer – Option 3 – an enzyme

An enzyme acts as a catalyst accelerating a reaction. In the above diagram an enzyme helps the break down of the starch molecule into simple sugars. Hence, option 3 is correct.

An antibody, a receptor molecule or a hormone do not help in breaking a starch molecule into simple sugars. Hence, options 1, 2 and 4 are incorrect.

 
Living Environment Regents August 2008 Question 36 PDF Print E-mail
NYS Living Environment Regents August 2008

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Correct Answer – Option 1 – simple sugars

Starch is digested into simple sugars. Hence, option 1 is the correct answer.

Starch cannot be broken down into fats, amino acids or minerals. Hence, options 2,3 and 4 are incorrect.

 
Living Environment Regents August 2008 Question 31 PDF Print E-mail
NYS Living Environment Regents August 2008

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Correct Answer – Option 3 – Photosynthetic rate in the algae is greatest in blue light

Photosynthetic activity by algae leads to generation of oxygen. The graph above shows maximum oxygen production at the point of exposure of blue light to algae. Hence, we can interpret that under the influence of blue light photosynthetic rate in algae is highest.

Oxygen production increases as the wavelength of light increases from 550 to 650nm. Hence, option 1 is incorrect.

 
Living Environment Regents August 2008 Question 27 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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