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7. a) If seedlings are grown in a water culture, what chemical compounds 



should the water contain to be a perfect nutrient solution ? 



b) What chemical changes occur in a seed during germination ? 



c) Why is clover planted to improve the soil for later crops ? 



d) When fresh-water plants are placed in salt water, and salt-water plants 



put in fresh water, what changes occur in the cells of each ? Explain 

 why these changes occur. 



e) Give a chemical test for sugar. 



8. Explain the relation of transpiration in the following instances: (a) Fall of 



leaves; (b) Adaptations in desert plants; (c) Distribution and position of 

 leaf stomata; (d) Protection of winter buds; (e) Wilting of plants. 



9. a) Explain the reasons for the following contrasted groups in the classilication 



of plants: (i) Gymnosperm — Angiosperm, (ii) Monocotyledon — 

 Dicotyledon, (iii) Annual — Perennial, (iv) Monoecious — Dioecious, 

 (v) Polypetalous — Apetalous. 

 b) Name a plant which is an example of each of these ten classes. 



10. Name and briefly describe a representative of the following groups of plants: 



(a) a fern, (b) a blue-green alga, (c) a lichen, (d) a palm, (e) a mushroom. 



Group III 



11. Name five common weeds. State how you would identify each. Describe 



the seed dispersal of two especially successful weeds. Name two weeds 

 that have other methods of propagation and describe the methods. 



12. a) State upon what substances, and under what conditions, colonies of 



bacteria may be grown most favorably for examination. 

 b) Discuss bacteria in relation to dairy products. 



13. Name five new uses of plants, or plant products, called forth by the war. 



State the part or parts of the plant used in securing these products. 



14. What measures are being taken to control the spread of the following plant 



diseases: (a) White pine blight, (b) potato wart, (c) wheat rust, (</) the 

 smuts on oats, wheat, corn, and barley, (e) the grape mildew. 



15. Name two useful plants of each of the five following families of plants, and 



state for what purpose each of the ten plants is used: (a) Grass family, 



(b) Solanum or Nightshade family, (c) Spurge family, (d) Rose family, 

 (e) Parsley family. 



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