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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.
a thin hairlike outgrowth of an epidermal cell of a plant root that increases the surface area...
a hormone that causes the secretion of gastric juices into the stomach.
biological classification group (taxon) for animals that is divided into classes. The plural of...
a hormone produced by the pituitary gland, which helps to limit the amount of water lost from...