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double-membraned, pigmented, cytoplasmic organelles found in plant cells. The organelles have various physiological functions, such as the synthesis and storage of various substances.
pigments that occur in the brightly coloured, yellow, orange or red parts of the plant, such as...
process whereby excess amino acids are broken down in the liver to form urea.
the form in which carbon dioxide is transported in red blood cells.
the non-living ground tissue with thick-walled cells that gives strength, support and protection...
having similar parts regularly arranged around a central axis.