THE LEAF 77 
(a) Their composition ; 
(b) Incision ; 
(ce) Apices ; 
(d) Outline; 
(e) Margin ; 
Pepper tree, Acacia, Mimosa, Violet, Sunflower, Iris, and 
Chrysanthemum. 
5. Sketch a leaf of the Sweet Pea, marking the tendrils. 
6. Embed a Privet leaf in pith. Cut a transverse section 
through the midrib. Mount it and examine it under the micro- 
scope. Note— 
(a) The epidermis and stomata ; 
(b) Palisade cells ; 
(c) Spongy tissue ; 
(d) The vascular bundle. 
7. Strip the epidermis off a leaf. Mount it and examine it 
under the microscope. Note the stomata. Make a sketch of 
the surface view of the epidermis. 
QUESTIONS ON CHAPTER V. 
1. Mention the chief differences between the tissues of a 
typical stem (e.g. Sunflower) and a typical leaf (e.g. Privet)— 
(a) As regards structure ; 
(6) As regards function. 
2. What are the parts of a leaf? Describe the leaves of an 
Acacia with reference to— 
(a) Development ; 
(b) Shape ; 
(c) Venation. 
3. On what parts of plants do stomata occur? On which 
parts are the largest and on which the smallest number of them ? 
Show how different plants differ in this respect. Name some 
plants which are devoid of stomata. 
4, Give a sketch of :— 
(a) An exstipulate simple leaf, with reniform outline, dentate 
margin, and reticulate venation. 
