THE ROOT OF THE ANGIOSPERM 37 
PRACTICAL EXERCISES. 
1. Sketch a longitudinal section of the apex of a maize root 
to show the root-cap. 
2. Sketch a mustard seedling showing the root-hairs. It is 
best to grow the seedling in damp air, and then put the whole 
seedling in water, when the root-hairs separate and become 
obvious. 
3. Sketch the root systems of— 
(a) The maize ; 
(b) The broad bean ; 
showing the difference between the monocotyledon and di- 
cotyledon root systems. 
4, Cut thin transverse sections of fresh bean roots, or of one 
that has been hardened in alcohol. Place sections in a watch- 
glass of water, removing them with a moist camel-hair brush. 
Place a drop of glycerine on a slide, put the thinnest section in 
the glycerine, cover same with a glass, and examine under the 
low power of the microscope. Make a sketch showing— 
(a) Piliferous layer ; 
(b) Cortex ; 
(c) Central cylinder. . 
Exam ne the section under high power and draw— 
(a) The endodermis; 
. (b) Pericycle ; 
(c) Xylem strands ; 
(d) Phloem strands, 
5. Repeat with maize root. Make out— 
(a) Epidermis ; 
(b) Ground tissue ; 
(c) Vascular bundles, 
QUESTIONS ON CHAPTER III. 
1. Describe the following types of roots, in each case giving 
an example :— 
(a) Tap root ; 
(b) Tuberous roots ; 
(c) Adventitious roots. 
