Plant Transport AS. Much Knowledge So Application. Overview. Shoots – Leafs & Stems Roots – Underground 3 Tissue types in the above Dermal, Vascular, & Ground 5 Types of Differentiated Plant Cells Parenchyma Collenchyma Sclerenchyma Xylem Phloem. Shoots.
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Absorbs water & Minerals
May store sugar & starches
Fibrous Roots – mat of thin roots that are spread just below the root’s surface
Taproots – 1 thick, vertical root with many lateral roots that emanate from it
Which root type is focused on absorption?
Which root type is focused on storage?
Fibrous roots are not efficient absorbers, so what structure is responsible for absorption?
What is the function of root hairs or mycorrhizae?
Cover entire plant
Protect against water loss
Nonspecific defense mechanism
Continuous throughout the plant
Transports material between roots and shoots
a) Xylem– transports water & minerals up from the roots
b) Phloem– transports food from the leaves to rest of plant
Tissue that is neither dermal nor vascular
Pith – ground tissue inside vascular tissue
Cortex– ground tissue outsidevascular tissue
Parenchyma, collenchyma, and sclerenchyma
1. Paren(chyma)-- Most abundant cell type-- Present throughout the plant-- perform most of the metabolic functions of the plant (Photosynthesis & Respiration)
2. Collen(chyma)-- Support growing parts of the plant-- Grouped into cylinders
– Water conducting cells-- 2 types: Tracheids & Vessels-- Both types are dead at functional maturity
-- Tracheids found in ALL vascular plants -- Long thin cells with lignin -- Water moves through the pits
-- Vessels(Vessel Elements) found primarily in angiosperms -- Have pits & perforated end walls for water movement
-- Transport Sucrose & other organic compounds
2 Types: Sieve-tube elements & Companion Cells -- Both types are alive at functional maturity
Why are there two types of mesophyll?
Why would there be spaces in the spongy mesophyll?
Why would there not be spaces in the palisade mesophyll?