2.2 roots Flashcards
define tap roots
typical of dicots with deep primary root and many laterals
Fibrous root definition
monocots, with wide shallow fibrous root system
name two specialized roots
stilt root and mangrove
define protoderm
forms epidermis
define ground meristem
forms parenchyma
Define procambium
forms vascular tissues
what hormone does meristem make
IAA
what does IAA do?
makes meristem difuse to new small cells in elongnation zone
what are the two parts of the differentiation zone
cortex and stele
what is in the cortex (3)
1) epidermis provides protection
2) parenchyma sotres water and starch
3) endodermis makes selection of ions to enter the root
What is the stele
phloem sugar-sap transport to leaf
what is the role of the Casparian strip
it blocks the passive flow of stuff into the endodermis, and instead only certain stuff can get through
what are the limiting nutrients of most plants
NPK
what nutrient is needed for grains in temperate
N
what nutrient is needed for leafy green vegetables
K
What nutrient is needed for tropical agriculture
P
in what form is Al accumulated in the soil
Al2O3
How do plants like their NO3?
as NH4 (because amino acids)
What are mycorhizzae with
fungi
What are N fixers with
bacteria
How many cells are mycorrhizae
1
what are nodules
Where bacterial symbionts fix N2 into NH4
What is Leg hemaglobin
an oxygen ferrier
what kind of environment does Nitrogenase need to work
oxygen free, so Leg Hemaglobin takes away oxygen
what is the most efficient fixer of nitrogen in legumes
soya
what is a nitrogen fixing tree in the North
alder
