View
232
Download
1
Category
Tags:
Preview:
Citation preview
Roots—2 main typesFibrous root Branching root system Spreads out
underground Ex. Corn, trees, many
weedsTap root One large root Does not spread out
but may grow deep Ex. Dandelions,
carrots, radish
Parts of a Root Root hairs
Increase surface area Bring in more water
Cortex Stores food
Vascular cylinder Central “core” Contains growth tissue,
phloem, xylem Root cap
Protects root tip as it grows through the soil
Specialized Roots Prop Roots—above
ground, give support Ex. rainforest tree,
corn
Pneumatophores—roots extensions reach above water to get oxygen
Ex. mangrove
More Specialized Roots
Buttress Roots—thick roots (extensions of trunk) that give support
Adventitious Roots—roots that can sprout from other tissues; may grow a new plant forma clipping
Ex. ivy, philodendron
Even More Specialized Roots Contractile roots— pull a plant
into the soil to the correct depth Ex. onion, tulip bulb
Haustorial root—parasitic roots that dig into another living plant’s roots to steal water and food
Ex. misteltoe
Not done! Specialized Roots III
And the final & biggest specialized use of plant roots . . .
FOOD STORAGE! All plants store food in their roots, but these plants go overboard!
Water storage—store water underground
Ex. Cucurbita foetidissima—may store 158 lbs of water!
Answer each question below on a separate sheet of paper.
1. What are the 3 functions of a root?2. What are the 2 main types of roots?3. What tissue would you find inside the vascular
cylinder?4. Why does a plant have root hairs?5. What may happen if a root doesn’t have a root
cap?6. Where is food stored in the root?7. Name 3 examples of specialized roots.
Recommended