Stems, spores, & leaves #17 Flashcards
What are the traits that allow plants to begin specializing life on land & why?
Vascular plants (tracheophytes) & lignified tissues for conducting water/ non-lignified tissues to conduct product of photosynthesis
What are the 2 kinds of vascular tissue?
xylem & phloem
What is xylem made of?
Tracheids/ water conducting cells are dead & lignified
What does xylem carry?
Water & minerals
What is phloem made of?
Cells arranged in tubes that are alive
What does phloem carry?
Sugar, amino acids, organic materials
What are the primary tissues?
epidermis,primary xylem, primary phloem, pith, and cortex
Where are the primary meristems developed from?
Apical meristem
What are the 3 groups of primary meristems developed from apical meristem?
Protoderm: epidermis
Procambium: primary xylem, primary phloem,
Ground meristem: pith & cortex
What is woody tissue?
Homoplasy/ secondary growth
Why is there no “tree” clade for woody tissue?
Bc different groups produce woody tissue via different mechanisms
Vascular cambium
Meristematic (undifferentiated) cells that continue to divide
What is the importance of undifferentiated tissue (regarding meristematic)?
Immature phloem cell (outside) & immature xylem cell (inside)
Where does photosynthesis occur on the leaf?
Palisade mesophyll cells
Where does gas exchange occur on the leaf?
Spongy mesophyll cells
