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Light Reactions

nbsp;In the d...

Question

In the definition of light reactions, what is the meaning of this line----"Light energy is absorbed by chlorophyll molecules and is utilized for splitting water molecules into hydrogen and oxygen."

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Solution

During the process of photosynthesis, the light is absorbed by the chlorophyll present in the leaf surface. This absorbed light causes the photolysis of the water molecules into hydrogen,oxygen & free electrons. These free electrons pass through series of acceptor molecules leading to the generation of either ATP or both ATP & NADPH.

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Q. In the light reaction the energy is absorbed by chlorophyll. The absorbed energy is used in splitting the water molecule into its two components and releasing electrons

(H_{2} O ⟶ 2 H^{+} + O_{2} + 2 e)

, this reaction is known as :

Q. 1) Splitting of water molecules into hydrogen and oxygen by sunlight.
2) Absorption of light energy by chlorophyll 3) Reduction of carbon dioxide into carbohydrates.

Q. Analyse the given statements related to photosynthesis and arrange the process of photosynthesis in the correct sequential order.
1) Splitting of water molecules into hydrogen and oxygen by sunlight.
2) Absorption of light energy by chlorophyll.
3) Reduction of carbon dioxide to carbohydrates.

Splitting of $H_{2} O$ molecules into hydrogen ions and oxygen in the presence of light and stroma is photolysis.

Q. Complete the following by filling in the blanks numbered 1 to 10 with the appropriate word/term:
Photosynthesis involves light reaction and dark reaction. During light reaction, the chlorophyll present in the (1) _______________ gets activated by absorbing light energy. This energy splits (2) _______________ molecules to (3) _______________ and oxygen and releases two electrons. This process is called (4) _______________ . The (5) _______________ ions are picked up by NADP to form (6) _______________ . The ADP is converted to (7) _______________ . This process is called (8) _______________ . During the dark phase, the compound produced at the end of the light reaction reacts with carbon dioxide to form (9) _______________ . This product is converted to starch. The process is called (10) _______________ .

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