Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Bot 101 Botany: A Human Concern Plant Morphology Cont. • • • Shoot System winter twigs leaf morphology • • • Root System root architecture modified roots The Shoot System • Leaves • basic structure (morphology) midvein axillary bud stipule petiole + blade = LEAF Leaf Morphology cont. midvein net • venation parallel palmate pinnate parallel venation net venation Leaves • simple vs. compound rachis petiole Simple Leaf leaflet (no axillary bud) Compound Leaf 1 Leaves • palmately and pinnately compound twice pinnately compound palmately compound Leaf Morphology cont. • arrangement on stem alternate opposite whorled Leaf Morphology cont. • Modifications Thorns are modified stems Spines are modified leaves cladophyll leaf Prickles are modified epidermis 2 Flowers • basic structure (morphology) • whorls of modified leaves (for reproduction) • borne on modified stems • more later Leaf Morphology cont. •Modifications tendril insect traps spines Root Systems Root Systems cont. Basic Architecture (two types) 1. Tap root system 2. Fibrous root system lateral roots taproot system • central main root • penetrate deeply into soil • lateral roots branch from tap taproot taproot system fibrous root system • many branching roots • (no central root) • penetrates upper soil layers Taproot Fibrous 3 Root Structure • basic structure lateral root root hairs zone of elongation root cap 4