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a gland which secretes substances, usually enzymes, through a duct directly to the part of the body where they are needed.
in plants: the structure within a seed that will develop into the new plant.
(also called herbivore) an animal that feeds directly on plant matter.
bacteria that convert nitrogen in the air into compounds such as nitrites, nitrates and ammonia...
cells that are formed during secondary growth by the vascular cambium ring just to the outside...
plastids responsible for pigment synthesis and storage. They mainly contain carotenoids, but can...