New York State Chemistry RegentsNew York State Earth Science Regents

 
Living Environment Regents August 2010 Question 11 PDF Print E-mail
Friday, 27 May 2011 12:25

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Correct answer: (2) Increased concentration of glucose in leaf cells

Photosynthesis is the conversion of light energy, water, and carbon dioxide (CO2) into oxygen and chemical energy in the form of glucose, which is then to be stored or distributed to the different parts of the plant. Thus, when more carbon dioxide is used up, more glucose is produced as well.

Incorrect answers:

(1) Increased use of starch in root cells

During photosynthesis, carbon dioxide (CO2) and water is converted to glucose and oxygen through the use of light energy. Thus, sugar, such as starch, is not used up during the process. Sugar, together with oxygen, is used up during respiration.

(3) Increased ATP in root cells

ATP or adenosine triphosphate is the energy currency of cells. Energy is stored in the cells in the form of glucose. Thus, the energy formed after photosynthesis is not found as ATP, but as glucose molecules.

(4) Decreased concentration of oxygen in leaf cells

Plants produce their own food through the conversion of carbon dioxide (CO2), water, and sunlight into glucose and oxygen. Since this is a chemical reaction, then it must follow the rule that the reactants and the products must be in equilibrium. When carbon dioxide (reactant) is increased, the products, oxygen and glucose, must also increase.

 

 

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