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# If the number of stomata is 30 and the epidermal cell are 120 per unit area of a leaf, then the stomatal index is

$\begin {array} {1 1} (1)\;0.05 & \quad (2)\;0.5 \\ (3)\;0.2 & \quad (4)\;0.02 \end {array}$

(3) 0.2