Practice question

Grass flowers are highly reduced, each floret enclosed by lemma and palea borne within spikelet of Poaceae. Despite reduction, floral symmetry is zygomorphic due to adaxial position of palea, unequal lodicules and eccentric stamen arrangement causing bilateral symmetry in single vertical plane. Actinomorphic condition requires radial symmetry around centre as in mustard and Hibiscus, asymmetric in Canna due to single stamen, spiral rare. Zygomorphic adaptation reflects anemophily evolution, turgid lodicule opening mechanism and precise anther exsertion ensuring pollen release into air currents for widespread dispersal.