Question

Review the schematic diagram of photosynthesis and the involvement of the chloroplast in this process. We know that the purpose of photosynthesis is to convert light energy into usable chemical energy. That process takes several steps. One of the first steps in this energy conversion process is what?
A) Energy from sunlight is converted into a usable form of chemical energy, glucose.
B) Stored chemical energy in the forms of ATP and NADPH are transferred to the grand in order to produce glucose.
C) Energy from sunlight is absorbed by the thylakoid membranes, used to decompose water and transform carbon dioxide.
D) Energy from sunlight is absorbed by chlorophyll and converted into stored chemical energy, in the form of NADPH and ATP.

Answer 1

Answer: D

Explanation: The energy from light is absorbed by chlorophyll and converted

Answer 2

C

Photosynthesis is divided into light-phase and the dark-phase. The former occurs in the presence of sunlight while the latter is independent of sunlight.

Explanation:

The light-dependent phase begins the process of photosynthesis. The energy of the sun is used to split a water molecule into H+ and O- in a process called photolysis. IN the process, two high energy electrons are released and used to replace the ones that left the reaction system of the chlorophyll pigments. The electrons being replaced were conveyed through  a protein chain and their energy used to pump H+ ions into the thylakoid from the stroma. The electrons are ultimately used to reduce NADP+ into NADPH. This creates a proton motive force used by ATP synthase to create ATPs – a process called photophosphorylation.

IN the light-independent phase, carbon dioxide is reduced by NADPH to create glucose molecules in the Calvin cycle.

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