Pernicious Anemia. Macrocytic anemia, glossitis, peripheral neuropathy, weakness, hyperreflexia, ataxia, and other neurological manifestations characterize classical vitamin B12 (cobalamin) deficiency. It is common, however, to encounter patients with vitamin B12 deficiency who have atypical clinical or laboratory features.
Nutrient, Liquid and Energy Distribution. Most of the advantages of vascular tissues stem from this functional one: A tracheophyte's xylem and phloem--which comprise the vascular system and are housed in the stem--enable liquids, nutrients and energy to be transported and distributed throughout the whole of the plant.
Nonvascular plants do not have xylem or phloem, so they have to remain small for water and nutrients to reach all the cells in the plant. Think of vascular tissue as a highway system that allows things to be transported over a larger space.ascular plants have vascular tissue (xylem and phloem) which conducts water and nutrients from the roots throughout the entire plant. Therefore, they can grow quite tall and still all cells can obtain water and nutrients.