1918 



BOTANY 



Friday, June 21 2 p.m. Two hours 



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

 selected from any group. 



Group I 



1. The plant embryo: (a) Where found? (b) Of what parts composed? 



(c) How long may it stay in a dormant condition? (d) What are the 

 conditions necessary for its growth ? (e) Where is its food supply stored, 

 and how is it rendered available for the growing embryo ? 



2. How do monocotyledons and dicotyledons differ : (a) In the external appear- 



ance of the plant ? (b) In the internal structure of their stems ? (c) In 

 their leaf structure ? (d) In their floral plan ? (e) In their seed structure ? 



3. Name the principal ecological groups of plants, and briefly state how the 



structure of the plants of each group is fitted for the special environment. 



4. Roots: (a) Describe the most conspicuous structural features and the manner 



of growth of a young root, (b) Name a plant which has aerial roots. 



(c) Name and describe a root especially fitted for storage, (d) Describe 

 the roots of a parasite, (e) What is a mycorrhiza ? 



5. (a) What is a gametophyte ? (b) What is a sporophyte ? (c) Name a plant 



which has the gametophyte more highly developed than the sporophyte. 



(d) Name a plant which has the sporophyte dependent upon the gameto- 

 phyte. (e) Name a plant which has the sporophyte more highly developed 

 than the gametophyte. 



Group II 



6. (a) Give the distinctive features of the following plant famihes: (1) Pulse 



(Leguminosae), (2) Grass (Gramineae), (3) Nightshade (Solanaceae), 

 (4) Mustard (Cruciferae), (5) Rose (Rosaceae), (b) Name two food-plants 

 of each of these five families. 



7. Explain the exact part which water plays in: (a) germination, (b) food 



manufacture, (c) growth, (d) movement, (e) maintenance of rigidity. 



8. State how you would demonstrate the following facts giving clearly the 



essential points of your method, but not all the details: (a) carbon dioxide 

 is a product of plant respiration; (b) germinating barley seeds contain 

 diastase; (c) stomata are more abundant on the under side of most leaves 

 than on the upper side; (d) plants require nitrates for their growth; 



(e) beans contain protein. 



9. A bean seed was planted in May; from this seed a vigorous plant developed 



and reached full maturity before it was killed by frost in October. State 

 the most important periods of development and the chief events in the 

 life of this plant, noting what organs were most conspicuous at each period. 



10. (a) Give the distinctive features of the following groups of fungi: (1) yeasts, 

 (2) molds, (3) sac-fungi, (4) mildews, (5) mushrooms. (6) State briefly 

 why each group is important economically. 



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