Question

If rc and rs respectively represents cuticular and stomatal resistance, the total resistance (R) could be expressed as

• A. $R=rc+rs$
• B. $R=r-rs$
• C. $\frac{1}{R}=\frac{1}{rc}+\frac{1}{rs}$
• D. $\frac{r}{R}=\frac{1}{rc}-\frac{1}{rc}$

Answer 1

The correct option is C $\frac{1}{R}=\frac{1}{rc}+\frac{1}{rs}$

Resistance to the transport of water vapor in the leaves is referred to as leaf resistance This has both cuticular and stomatal components. Cuticular resistance is larger than stomatal resistance. Further, both the upper side of the lower side of the leaves have resistance associated with them. If Rc and Rs represents the cuticular and stomatal resistance, the total Resistance (R) can be expressed as 1/R= 1/Rc + 1/Rs

Therefore, the correct answer is option C.