3.1.3 Transport in Plants Flashcards
Why is a transport system necessary in larger organisms?
Distances between organs and between surface and cells in centre increase
Diffusion of essential molecules takes longer
Why do plants have a large SA:V?
Branching bodies
Why do plants not have gaseous exchange systems?
large SA:V
photosynthetic tissue (generate&use O2 and CO2)
low metabollic rate (low demand for O2 for aerobic respiration
What are the 2 plant systems for substance transport?
Xylem tissue
Phloem tissue
What does the xylem transport?
water and mineral ions
What does the phloem transport?
assimilates and mineral ions
What is a dicotyledonous plant?
a flowering plant with two embryo seed leaves
What are the 4 features of a dicot root?
cortex
stele
endodermis
pericycle
What is the cortex composed of?
parenchyma cells
What is the structure of the cortex?
rounded cells with air spaces between them
What does the stele contain?
Xylem and phloem
What is the endodermis?
a casparian strip made of suberin
waterproof
What is the pericycle?
a layer of cells just inside endodermis
