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Photosynthesis in Higher Plants — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYPhotosynthesis in Higher Plants1 Mark
MCQ
During light reaction in photosynthesis the following are formed.
  • A
    $\text{ATP}$ and sugar.
  • B
    Hydrogen, $O_2$ and sugar.
  • ✓
    $\text{ATP,}$ hydrogen donor and $O_2$.
  • D
    $\text{ATP,}$ hydrogen and $0_2$ donor.
✓

Answer

Correct option: C.
$\text{ATP,}$ hydrogen donor and $O_2$.
Light reaction occurs inside thylakoids. It is dependent upon light. It involves photolysis of water and production of assimilatory power $\text{(NADPH}$ and $\text{ATP)}$. Electrons released during photolysis of water are picked up by $P680$ photo centre of photo system $II$. From here electrons passes over series of carrier which include $PQ$, cytochrome $b-f$ complex and $PC$. While passing over cytochrome complex, the electron losses sufficient energy for creation of proton gradient and $\text{ATP}$ from $\text{ADP}$ and inorganic phosphate. From $PC$ electron is picked by the trap centre $P700$ of photo system I which pushes out electron after absorbing light energy. Electron passes over carriers FeS, ferredoxin and $\ce{NADP-}$ reductase which gives electron to $\ce{NADP^+}$ for combining with $H^+$ to produce $\text{NADPH.}$
$\text{NADP}^{+}+2\text{e}^{-}+\text{H}^{+}{\xrightarrow{\ \ \ \ \ \\ \ \ \ \ \ \ \ }}\ \text{NADH}$

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