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MODEL PAPER 5 — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYMODEL PAPER 51 Mark
MCQ
$C_4$ photosynthetic efficiency is more than $C_3$ pathway because:
  • A
    Photorespiration is present in $C_3$
  • ✓
    Photorespiration is present in both $C_3$ and $C_4$
  • C
    Photorespiration is fast in $C_4$ plants
  • D
    Photorespiration is suppressed in $C_4$ plants
✓

Answer

Correct option: B.
Photorespiration is present in both $C_3$ and $C_4$
$C_4$ plants are more efficient than $C_3$ plants because in $C_4$ plants there is no photorespiration in which fixed carbon is oxidized in the presence of sunlight due to the presence of Kranz Anatomy. There is also a double fixation of $CO _2$.

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