Many verb stems are made up of extensions from primary roots by the addition of one of the prefixes " al-" and " aa-", which often correlate with intransitive and transitive meanings respectively.
12.
The plumule is covered with a "'coleoptile "'that forms the first leaf while the radicle is covered with a "'coleorhiza "'that connects to the primary root and adventitious roots form from the sides.
13.
When there is limited bioavailable P in the soil, plants show extensive abiotic stress phenotype such as short primary roots and more lateral roots and root hairs to make more surface available for Pi absorption, exudation of organic acids and phosphatase to release Pi from complex P containing molecules and make it available for growing plants organs.
