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1920 



BOTANY 



Friday, June 25 2 p.m. Two hours 



Answer three questions of each group and one additional question which may be 

 selected from any group. Candidates are advised to apportion the time wisely among the 

 ten questions answered. Number each answer to correspond with the question selected. 



Group I 



1. a) Trace the course of the fibrovascular bundles throughout an entire plant. 



b) Of what parts is the bundle composed ? 



c) WTiat is the use of each part ? 



d) Of what is the heart-wood of a tree composed ? 



e) Of what use are the medullary rays ? 



2. Describe a cell in a growing region of a plant. Make a properly labeled 



drawing of it. How may it be changed to make it a conducting cell ? 

 A storage cell ? A supporting cell ? 



3. a) When a branch increases in size from one foot in length and a half-inch 



in diameter to five times these dimensions, what two types of growth 

 have occurred ? 

 b) What external markings or features may be observed during the winter 

 on a five-year-old branch ? 



4. a) Name a definite flower and describe its pistil, mentioning all the external 



and internal structures of the pistil which can readily be distinguished. 

 State what the permanent parts of the flower develop into later. 

 b) State the function of the following structures: (i) calyx, (ii) anther. 

 (iii) receptacle, (iv) pollen, (v) corolla. 



5. Briefly describe the following structures: 



a) The sporophyte of a moss plant. 



b) The reproductive organs of a mold. 



c) The prothallus of a fern. 



d) The thallus of a liverwort. 



e) The male flower of a pine tree. 



Group II 



6. Discuss chlorophyll, stating: (a) in what form and in what different plant 

 organs it occurs; (b) the conditions necessary for its formation and activ- 

 ity; (c) its work in the plant; (d) how it may be extracted from plants; 

 (e) what are the habits of plants that have no chlorophyll. 



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