A. Functions of Roots
Anchor & support plant in the ground
Absorb water & minerals
Hold soil in place
B. Root Types
2. Tap Roots –larger central root reaches deep water sources underground
Ex. Trees, Carrots, & Dandelions
1. Fibrous Roots: branching roots hold soil in place to prevent soil erosion
Root Hairs: increase surface area for water & mineral absorption
Meristem: region where new cells are produced
Root Cap: protects tip of growing root
C. The Structure of a Root
Support system for plant body
Transport system carries water & nutrients
Holds leaves & branches upright
Each light and dark tree ring equals one year of annual growth. Light rings for fast spring growth, dark for slow summer growth.
Smaller rings tell of past droughts that have occurred.
Looking at the picture to the left:
What years had the most rain?
What years experienced the worst drought?
Slide # 6
Main photosynthetic organ
Broad, flat surface increases surface area for light absorption
Have systems to prevent water loss
Stomata open in day but close at night or when hot to conserve water
waxy cuticle on surface
System of gas exchange
Allow CO2 in and O2 out of leaf
Elephant Ear Plant
Cuticle: waxy layer; covers upper surface
Protects leaf against water loss
Veins: transports water, nutrients and food
Made of xylem and phloem
Mesophyll: contains cells that perform photosynthesis
b/c they contain Chloroplasts.
2 Guard Cells
Slide # 7
More Plant Parts…
cells that open and close the stoma
Stomata: openings in leaf’s surface; when open: