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Leaves - • internal form transparent epidermis covers...

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Leaves leaf structure  - external/internal  external form - initiated by primordial in apical meristems o main sites of photosynthesis on land o cell enlargement/division >> leaves expand o microphyll - leaf w/ 1 vein o megaphyll - has several veins, leaves gap in cylinder once it branches off o veins - collection of xylem/phloem, parallel in monocots, networked in dicots o simple leaves - undivided blades o compound leaves - blades divided into leaflets o pinnately compound - leaflets arranged in pairs o palmately compound - leaflets radiate from a center o leaves alternately/oppositely arranged, or in whorls (leaf circle)
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Unformatted text preview: • internal form- transparent epidermis covers each leaf o no chloroplasts in epidermal cells o mesophyll - tissue between upper/lower epidermis, contains vascular bundles and majority of photosynthesis o palisade mesophyll - closer to upper epidermis, contains chlorenchyma o spongy mesophyll - closer to lower epidermis, contains many air spaces for gas exchange • stomata - surrounded by guard cells, regulates water mov’t/gas exchange o K+ controls guard cells o water enters osmotically >> guard cells swell >> stomata closes o opens in the day, closes at night...
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