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STD 11 - 11. photosynthesis in higher plants — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 11. photosynthesis in higher plants1 Mark
MCQ
The concentration of $CO _{2}$ in atmosphere is between
  • A
    $0.03-0.04 \%$
  • B
    $300-400 \;ppm$
  • C
    $400-600 \;ppm$
  • ✓
    Either $(a)$ or $(b)$
✓

Answer

Correct option: D.
Either $(a)$ or $(b)$
d
Carbon dioxide is the major limiting factor for photosynthesis. The concentration of $C O_{2}$ is very low in the atmosphere (Between $0.03$ to $0.04 \%$ or $300-400 \;ppm ) .$ Increase in concentration up to $0.05 \%$ can cause an increase in $C O_{2}$ fixation rates.Beyond this, the levels can become damaging over longer periods

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