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Light Reaction

Which of the ...

Question

Which of the events listed below occur in the light reactions of photosynthesis?

A

NADPH is reduced to NADP+.

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B

carbon dioxide is incorporated into PGA.

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C

ATP is phosphorylated to yield ADP.

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D

light is absorbed and funneled to reaction-center chlorophyll a.

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Solution

The correct option is D
light is absorbed and funneled to reaction-center chlorophyll a.

Light is absorbed by various pigments and funneled to the chlorophyll molecule at the reaction center. This leads to the flow of electrons through the ETC, splitting of water and the formation of ATP and NADPH.

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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) _______________ .

Which of the events listed below occur in the light reactions of photosynthesis?

Q. Which of the following events does not occur in photosynthesis?
(a) conversion of light energy into chemical energy
(b) reduction of carbon dioxide to carbohydrates
(c) oxidation of carbon to carbon dioxide
(d) absorption of light energy by chlorophyll

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) _______________ .

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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