Introduction It is the aerial part of the vascular plant. In botany it means, the plant axis that bears buds and shoots with leaves and, at its basal end, roots. It develops from the plumule and bears branches, flowers and leaves. It is differentiated into nodes and internodes which may not be distinct in some cases. It is normally positively … Read more
multicellular, triploblastic, bilaterally symmetrical with system grade of body organization. mostly aquatic, found in sea water or fresh water, some are terrestrial and burrowing, few are ecto-parasitic. body is elongated, cylindrical and metamerically segmented (body divided into many similar segments). body is covered by non-chitinous cuticle secreted by ectoderm. complete and straight alimentary canal. coelomate. … Read more