BIOA02H3 Lecture Notes - Lecture 3: Pericycle, Primordium, Meristem
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BIOA02H3 Full Course Notes
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Document Summary
Onion bulb (storage organ), potato tuber (store starch), ginger rhizome (underground stem), crocus corn (storage organ), strawberry stolons (underground stem) Petiole (in eudicots: large surface area for absorbing sunlight and co2, attaches leaf to stem. Interlocking spines of venus flytrap leaves, tendrils of sweet pea, hairs and glandular structures on a tomato leaf, stinging hairs on nettle leaf. Conduct water and minerals to aerial plant parts. Roots have no organization whatsoever positions are random. Taproots: adapted for storage and have a single main root w/ many smaller branching roots (lateral roots) Any structure arising in an unusual location such as roots that grow from stems or leaves. Zone of elongation: tissue systems complete differentiation, root hairs begin to form, cells stop dividing increase in length, primary meristems differentiate, phloem matures, xylem starts to form, root apical meristem segregate into 3.
