Question

Describe in short the various step that during the photochemical phase of photosynthesis​

Answer 1

Photochemical Phase (Light or Hill Reaction):

It occurs inside the thylakoids, especially those of grana region. Photochemical step is dependent upon light. The function of this phase is to produce assimilatory power consist­ing of reduced coenzyme NADPH and energy rich ATP molecules.

Biosynthetic Phase (Dark or Blackman’s Reaction):

It catalyses assimilation of CO2 to carbohydrates. The reactions are called carbon reactions. They occur in stroma or matrix of chloroplasts. The reactions do not require light. Instead assimilatory power (ATP and NADPH) produced during photochemical phase is used in fixation and reduction of carbon dioxide. All the enzymes required for the process are present in the matrix or stroma of the chloroplast.

There are two main pathways for the biosynthetic or dark phase— Calvin cycle and C4 di-carboxylic acid cycle. A third pathway is CAM metabolism which is intermediate between the two.

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Answer 2

hi sister........

here is your answer......

PHOTOCHEMICAL PHASE (Light or Hill Reaction):

It occurs inside the thylakoids, especially those of grana region. Photochemical step is dependent upon light. The function of this phase is to produce assimilatory power consist­ing of reduced coenzyme NADPH and energy rich ATP molecules

Photochemical phase involves the following reactions

(A) Photolysis Of Water :-

It is the process of breakdown of water molecule into hydrogen and oxygen under the influence of light during the light reaction of photosynthesis. In photosynthesis,chemical process by which molecules are broken down into smaller units through the absorption of light

(B) PRODUCTION OF ASSIMILATORY POWER (NADPH and ATP)

Assimilatory power is the power of plants in the form of ATP & NADPH (produce during light reactions) to obtain food in the form of carbohydrates from the reduction of CO2 during photosynthesis. Stroma is matrix or the cytoplasm of chloroplast where dark reaction of photosynthesis takes place.

hope it helps you..... sister !!