Why the value of respiratory quotient (R.Q.) is zero in case of succulent plants such as Opuntia?

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In succulent plants (e.g., Opuntia), all the CO₂ produced during respiration is fixed internally for use in photosynthetic activity during the day, as a result O₂ is consumed but CO₂ is not evolved. So, R.Q. is zero.

2C₆H₁₂O₆ + 3O₂ ----> 3C₄H₆O₅ + 3H₂O

R.Q.: = Zero CO₂/3O₂ = zero

Haren · Answer 1 · 2023-07-31T14:10:31+0000

In succulent plants (e.g., Opuntia), all the CO₂ produced during respiration is fixed internally for use in photosynthetic activity during the day, as a result O₂ is consumed but CO₂ is not evolved. So, R.Q. is zero.

2C₆H₁₂O₆ + 3O₂ ----> 3C₄H₆O₅ + 3H₂O

R.Q.: = Zero CO₂/3O₂ = zero

Why the value of respiratory quotient (R.Q.) is zero in case of succulent plants such as Opuntia?

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