Chapter 29.4- Root growth and development

Question 1

How does root stems grow?

Answer 1

The root apical meristem grows roots at its tip after elongation ends and differention starts

Question 2

What are some ways in which roots differ from plant stems?

Answer 2

1. roots are thinner than stems. Increases SA:V ratio to absorb more nutrients in plant soil
2. roots contain a root cap to protect the meristem of the root.
3. Roots cannot be seen without a microscope

Question 3

What is the Casparian strip?

Answer 3

a waxy band that surrounds endodermal cells it makes all cells enter the xylem through the plasma membrane.

Question 4

Draw and label the structure of a root

Answer 4

Draw into textbook

Question 5

How is auxin received by roots? and what function does it deserve?

Answer 5

1. Auxin gets produced by the shoot meristems
2. Moves down the stem into roots by phloem
3. Reaches the root cap and triggers the creation of procambial cells

Question 6

What transformations occur during secondary growth of root cells?

Answer 6

has a secondary xylem and secondary phloem just as plant stems

Question 7

How to roots branch off?

Answer 7

they branch from root meristems located in the pericycle, which is a layer of cells outside the endodermis.

it grows through the endodermis cortex and epidermis

Question 8

What is a consequence of roots coming from the pericycle?

Answer 8

new roots can form from the pericycle randomly. These new roots are short live but use up carbon and energy from the cell.

Question 9

What do plants with swollen roots store?

Answer 9

starch