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Light Reaction

What occurs d...

Question

What occurs during the light reaction of photosynthesis?

Chlorophyll is produced

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Water splits to form

2 H^{+}

and

O_{2}

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C O_{2}

is given off as a waste

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Sugar is formed from

C O_{2}

and water

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Solution

The correct option is B Water splits to form $2 H^{+}$ and $O_{2}$
The photolysis of water occurs during light reaction. The site for occurrence of photolysis is thylakoid lumen. The photolysis of water releases protons, which accumulate in the lumen and contribute to the electrochemical gradient of protons. The electrons released are used up to fill the electron hole in the reaction centre of PSII and oxygen molecule is released as by product of photosynthesis. The electrons released during photolysis of water are ultimately used to synthesize the reducing power for reducing carbon dioxide later on. The mineral ions required for photolysis of water are calcium, manganese and chlorine.

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Similar questions

Q. What is the

△ H

of the reaction to form

C O_{2}

from

C O + O_{2}

in the given energy profile diagram?

Q. The splitting of

H_{2}

O to form

O_{2}

and carbon compounds occur during:

Choose the right sequential phenomena among the following during the delivery of

O_{2}

from blood to tissue.

P: Absorption of

C O_{2}

by the blood.

Q: Reaction of absorbed

C O_{2}

with

H_{2} O

to form

H_{2} C O_{3}

within RBC and its conversion into

H^{+}

and

H C O_{3}^{-}

ions.

R: Reaction of absorbed

C O_{2}

with

H_{2} O

in plasma to form

H_{2} C O_{3}

and its conversion into

H^{+}

and

H C O_{3}^{-}

ions.

S: Combination of

H^{+}

with heme portion of

H b O_{2}

to release

O_{2}

T: Combination of

H C O_{3}^{-}

with heme portion of

H b O_{2}

to form reduced hemoglobin and release of

O_{2}

During Hatch and Slack pathway, PEP combines with

C O_{2}

in the presence of enzyme PEP case, to form OAA. This process of initial fixation of

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occurs in

Q. Refer to the following potential energy diagram and the choices above

What is the

△ H

of the reaction to form

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C + O_{2}

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