Question

Base your answers to questions 28 through 31 on the incomplete reading passage below and your...

Base your answers to questions 28 through 31 on the incomplete reading passage below and your knowledge of biology.

         Biologists generally agree that the process of photosynthesis can be

         divided into two major reaction sets. These are often referred to as

         the light and dark reactions. During the light (or light dependent)

         reactions, molecules of [A] are "split," producing hydrogen atoms

         and a gas, [B]. During these reactions, extra energy is stored in

         molecules of [C].

         The dark (or light independent) reactions, also known as the

         carbon fixation reactions, require no light because they are

         powered by the energy molecules made in the light reaction.

         A three-carbon compound known as [D] is formed during these

         reactions.

28. Which substance belongs in box A?                          

         a. carbon dioxide                           c. nitrogen        

         b. water                                         d. carbohydrate    

29. Which substance belongs in box B?                      

         a. methane                                    c. carbon dioxide

         b. nitrogen                                     d. oxygen

30. Which substance belongs in box C?                       

         a. adenosine triphosphate             c. deoxyribose

         b. ribose                                        d. lactic acid

31. Which substance belongs in box D?                          

         a. RNA                                           c. PGAL (G3P)  

         b. DNA                                           d. ADP        

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Answer #1

Answer

28. b. Water

29. d. Oxygen

30. a. Adenosine triphosphate

31. c. PGAL (G3P)

Explanation- During the light reaction, water molecules split into Protons, Oxygen and Electrons. This process is called Photolysis of water. The light energy trapped by the pigment molecules during light reaction is stored in ATP (adenosine triphosphate) and NADPH. During dark reaction, glucose is synthesised through a cycle of intermediate compounds such as PGA, PGAL, RuBp etc. Dark reaction is also called calvin cycle.

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