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a perforated wall or part of a wall at the end of one of the individual cells making up a sieve tube.
found in the cell wall of xylem cells where the secondary cell wall is absent but the primary...
the part of the cell that controls all the activities of the cell and plays an important role in...
small solid particles of matter such as soot, ash, metal and dust.
a thin, flexible layer of the plant cell wall inside the middle lamella. It consists mainly of...
blood vessels that transport deoxygenated blood from the heart to the lungs.