Entry of pollen tube into the ovule through chalaza was discovered by Treub in a Xerophyte. This plant is associated with a pair of characters given below

Question

(I) Unisexual flowers

(II) Sessile flowers

(III) Centripetal arrangment of flowers

(IV) Bisexual flowers

The correct pair is

$\begin {array} {1 1} (1)\;(II),(III) & \quad (2)\;(III),(IV) \\ (3)\;(II),(IV) & \quad (4)\;(I),(II) \end {array}$