Roots

Main functions of roots

Main functions of roots

External anatomy of a root

Be able to identify parts of a root and the main function of each part

Root hairs

Cross section of monocot and dicot roots (images)

Composition of a root; casparian strip, pericycle, etc. (endodermis)

Origin of lateral roots

What type of root does Ranunculus have?

Eudicot

What type of ground tissue(s) are in the cortex?

Parenchyma

What are some of the functions of the cortex?(hint look at the purple pigments inside the parenchyma)

Provide support and perform metabolic processes

1. Locate the pericycle under the endodermis (right picture). What type of structure will it become later?

Lateral root

Locate the casparian strip surrounding the endodermis. What is the main function of this? What is it made up of?

Control the passive flow of water and solutes(ossicles control) into the steel (to the xylem) . Water impermeable ring of wax.

What is the stele?

The central part of the root containing tissues derived from the procambium.

What tissue occupies the central portion of the steel? Look at the left picture, how would you describe the shape?

Primary xylem, cross-shaped with arms extending out toward the endodermis.

What is the difference between monocot and dicot?

Monocot has/produces xylem

Dicot- no pith because is dominant in endodermis

What tissue occupies the central portion of the stele?

Primary xylem (parenchyma)

Does the lateral root develop adjacent to the primary xylem or the phloem?

Primary

From what tissue does the lateral root develop?

Pericycle

What does the pericycle contain?

Parenchyma

What is the function of the root tip?

Protect the root From mechanical injury

What type of plastids enable the sensing of gravity on the root tip?

Amyloplasts

Locate the root hair. Where in a root do root hairs originate?

Region of maturation or differentiation

What is the function of root hairs?

Absorb water, from in between soil particles and minerals.

What do root hairs do to the roots that allows them to carry out their function more efficiently?

Increase the surface area for the absorption of water

List one of the functions of roots

Absorb water, provide support

Which one is monocot root? A or B

B

Which one is dicot root? A or B

A

What surrounds xylem and phloem of vascular cylinder of the roots?

Pericycle

What is called water-impermeable ring (suberin) of wax around endodermis in plants ?

Casparian strip

The letter D represents the area of cell_ (meristematic region), which is where the apical meristem cells divide once or twice per day.

Division

The letter E represents the root_, which is a thimble-shaped mass of cells that protects the apical meristem from mechanical injury as the root grows through the soil.

Tip/cap

Name one of the modified roots

Not modified

Lateral roots arise from?

Pericycle