Chapter 24 Roots Flashcards
Which type of plant has a pith?
monocots
What layer sits right inside of the endodermis?
pericycle
What are the lines called between the primary xylem and primary phloem?
the vascular cambium
What three tissues make up the periderm?
cork (produced outward by cork cambium)
cork cambium (from secondary meristem)
phelloderm (grows inward from cork cambium)
Where do lateral or branch roots grow from?
they grow from the pericycle
what is another name for aerial roots?
adventitious roots
Aerial roots serve three functions. Name them.
aeration
stabilization
support
Describe aerial roots.
they are a root the grows from an above ground location.
monocot and dicot are what type of names?
taxonomic (like mammal vs. reptile.)
True or false. Roots need oxygen for respiration.
True.
How do plants thrive in flooding areas?
they form aerenchyma tissue (from parenchyma tissue) in roots to ventilate submerged tissues.
True or false. Some plants grow roots up out of the water to help with aeration (grow from ground upward.)
True.
What are Pneumatophores?
negative gravitropic roots that grow from underwater upward to aerate below water tissues.
What are contractile roots?
roots on bulbed plants that can shorten to draw the bulb below ground during adverse conditions. (10-70%)
What are epiphyte roots?
they form a commensal relationship with another plant and grow roots around them. This helps hold the plant in place. It does not hurt the other plant.