Presentation on theme: "Week 3:. Key (6pts) Create a dichotomous key for these shapes: circle, rectangle, hexagon, triangle Leaf Morphology (4pts) 1. This type of leaf has."— Presentation transcript:
Key (6pts) Create a dichotomous key for these shapes: circle, rectangle, hexagon, triangle Leaf Morphology (4pts) 1. This type of leaf has several blades per axillary bud. (simple/compound) 2. The space between nodes is described as this. (alternate/internode/opposite) 3. This term describes leaf margins that are smooth. (serrate/lobed/entire) 4. This type of venation has a hand-like pattern. (pinnate/palmate)
Key (6pts) 1. Create a dichotomous key for the following shapes: ellipse, triangle, rectangle, octagon Leaf Morphology (4pts) 2. This type of leaf has one blade per axillary bud. (simple/compound) 3. This term describes feather-like venation patterns. (palmate/pinnate) 4. In terms of leaf attachment to a branch, this term describes nodes that are offset. (whorled/alternate/opposite)
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Stems and Leaves Roots The vascular tissue system Big Idea: Identify gross anatomy of plant structures.
Plant body is divided into two parts: root system and shoot system. The shoot system contains: stems, leaves, and flowers. Stems: alternating system of nodes (where leaves are attached). Leaves: primary photosynthetic organ
I.Stems: Many unique characteristics can be used to identify deciduous species in the winter. Can determine age and leaf arrangement easily Buds are also key in identification
I.Stems: Herbaceous Eudicots: Vascular tissue develop in discreet bundles forming a ring at the stem periphery Xylem and Phloem separated by fascicular cambium within the bundles Separated by the interfascicular cambium between the bundles.
Leaf Morphology Lamina: the blade (or leaf) Petiole (attaches leaf to stem) or basal sheath (if sessile= without a stalk) Simple or compound Venation patterns (pinnate or palmate) Axillary buds (present at nodes)
3 Tissue systems: Dermal (general function- protection) Vascular (xylem and phloem, transport and support) Ground (photosynthesis, storage, and support)
Modified Leaves: Spines: reduce water loss and help protect Tendrils: support and attachment Prickles and thorns: protection
Modified Stems: Stems normally grow above the ground but can be modified for diverse functions. Vegetative propagation to food storage Types of modified stems: tubers, stolons, rhizomes, and bulbs
Primary Root: Gymnosperms and Eudicots Taproot gives rise to lateral roots
Root Hairs absorb water and minerals Roots have large cortex (ground tissue) for storage of starch and other compounds The endodermis with casparian strip (impermeable to water) make it necessary for any substance entering the vascular system to enter via the endodermal protoplasts Center of the cylinder is filled with primary xylem, while the primary phloem is found between the ridges of xylem