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The closing of pome lenticels can arise when the cuticle over the stomata opening or the substomatal layer seals. Closing can also begin if the substomatal cells become suberized , like cork . The number of lenticels usually varies between the species of apples, where the range may be from 450 to 800 or from 1500 to 2500 in Winesap and ...
Photosynthesis depends on the diffusion of carbon dioxide (CO 2) from the air through the stomata into the mesophyll tissues. Oxygen (O 2), produced as a byproduct of photosynthesis, exits the plant via the stomata. When the stomata are open, water is lost by evaporation and must be replaced via the transpiration stream, with water taken up by ...
In botany, a stoma (pl.: stomata, from Greek στόμα, "mouth"), also called a stomate (pl.: stomates), is a pore found in the epidermis of leaves, stems, and other organs, that controls the rate of gas exchange between the internal air spaces of the leaf and the atmosphere.
1. In flowering plants, a ring of structures that may be united in a tube, arising from the corolla or perianth of a flower and standing between the perianth lobes and the stamen s. The trumpet of a daffodil is a corona. 2. In grasses, a hardened ring of tissue surmounting the lemma in some species. cortex. pl. cortexes or cortices
In floating aquatic angiosperms, the leaves have evolved to only have stomata on the top surface to make use of atmospheric carbon dioxide. [15] Gas exchange primarily occurs through the top surface of the leaf due to the position of the stomata, and the stomata are in a permanently open state.
Vernal pool flowers, with different species occurring in zones related to soil moisture and temperature gradients formed as the pool dries out. Sacramento National Wildlife Refuge, Calif. In vernal pools, flowering occurs simultaneously because of the seasonality of favorable conditions.
Pneumatodes are considered as a special type of cyclocytic stomata. The entire structure may rise above the adjacent epidermis. The pneumatodes may function as double structures for gas exchange and liquid water elimination . [6] Leafless orchids with photosynthetic roots rely on the gas exchange through pneumatodes for photosynthesis.
Pool (cue sports), a group of games played on a pool table; Pool (poker) or pot (poker), money wagered during a single hand of poker; Pool betting or parimutuel betting, a betting system in which all bets of a particular type are placed together Betting pool, a form of pool betting where gamblers pay a fixed price into a pool