MONOCOTYLEDONS. 307 



12. Describe the whole of an Early Purple Orchid plant as seen 

 when in flower in early summer, omitting the flowers themselves. 



13. Describe, from your own observations, the growth of an Early 

 Purple Orchid from the time when its leaves first come above ground 

 until they die down. When did you first see the leaves, and when do 

 they die down ? 



14. Describe, with sketches from actual specimens examined, the 

 flower of the Early Orchid, and explain its adaptations for pollination. 

 Describe experiments you have made with the flowers. 



15. Compare the following plants with regard to the nature of their 

 reserve food and that of the food-storing organs : Crocus, Bluebell, 

 Garden Hyacinth, White Lily, Orchid, Onion. 



16. Describe the structure of a Wheat grain, as seen with a lens. 

 Give sketches. 



17. Describe the growth of a Wheat seedling up to the time when 

 four or five foliage-leaves are visible. What structure can usually be 

 found at this stage, on opening up the shoot ? 



18. Describe the shoot- and root-systems of a growing Wheat plant, 

 about the end of May, omitting the flowers. What is meant by 

 " tillers " ? Give sketches. 



19. Describe carefully the structure of a " node " of the Wheat plant. 

 How do the nodes differ from the rest of the shoot, and what is the 

 importance of this difference? 



20. Describe the spike of Wheat, and give a careful account, with 

 sketches, of the structure of a single " ear " (spikelet "). 



21. Describe a few of the weeds found growing in a cornfield (1) when 

 the Wheat is young, (2) when it has reached its full height. How are 

 these weeds adapted to their mode of life ? 



22. Describe the structure of the flower and the mode of pollination 

 of any common wild Grass you have examined. Give sketches. 



23. Show by means of floral diagrams how the flowers of Orchis 

 and Wheat (or other grass) may be considered to have been derived 

 from such a flower as that of a Lily. How do you account for the 

 striking differences of structure between the flowers of Orchis and 

 Wheat? 



24. To what Orders do the Hyacinth, the Snowdrop, and the Crocus 

 belong? Give in tabular form the distinguishing characters of these 

 Orders, showing the resemblances and differences between them. 



