Xylem and Phloem (Leaving Cert Biology): Flashcards
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Two types of xylem
Two types of xylem
Vessels and tracheids
Xylem: living or dead tissue?
Xylem: living or dead tissue?
Dead tissue
What does xylem transport?
What does xylem transport?
Water and minerals (roots to leaves)
Vessels vs tracheids: which is wider?
Vessels vs tracheids: which is wider?
Vessels
Material strengthening xylem walls
Material strengthening xylem walls
Lignin
Function of pits in xylem
Function of pits in xylem
Allow water to move between vessels/tracheids
Tracheids vs vessels: which is more primitive?
Tracheids vs vessels: which is more primitive?
Tracheids
Two components of phloem
Two components of phloem
Sieve tubes and companion cells
What are sieve plates?
What are sieve plates?
Pores in end walls of sieve tube cells
Do sieve tube cells have a nucleus?
Do sieve tube cells have a nucleus?
No
What controls sieve tube elements?
What controls sieve tube elements?
Companion cells
Phloem: living or dead tissue?
Phloem: living or dead tissue?
Living tissue
What does phloem transport?
What does phloem transport?
Food (from photosynthesis)
Material in phloem walls
Material in phloem walls
Cellulose
Flow direction in xylem vs phloem
Flow direction in xylem vs phloem
Xylem: upwards; Phloem: upwards or downwards