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two bean-shaped guard cells surrounding a pore in the epidermis of a leaf that allow gases to enter and leave the leaf. The guard cells regulate the size of the pore in order to control the exchange of respiratory gases and the rate of transpiration.
is the gaining of a plant's ability to flower or germinate in the spring after exposure to the...
a hormone that causes the secretion of gastric juices into the stomach.
cellular respiration that takes place when free oxygen is absent
tissue that covers the surfaces of the body (the skin) and lines the ducts of the gut.
(also called autotrophic organisms) organisms that produce their own organic food, mainly...