FRUITS AND SEEDS. 265 



17. Give a concise life-history of any one annual plant that you 

 have grown throughout the year, with approximate dates at which the 

 different organs appeared, stating at the same time the conditions 

 under which it was grown. If possible, give sketches of the different 

 phases of development. 



18. Trace the life-history of any plant, living for more than a year, 

 which you have carefully tended under cultivation from seed and back 

 again to seed. 



19. Name a fleshy fruit. Describe the structure of the flower of the 

 plant to which it belongs and the development of the fruit, and point 

 out any advantages derived by the species from its fleshy structure. 



20. Describe the changes which an ovule undergoes in becoming a 

 seed. 



21. Mention two plants each of which possesses a persistent calyx. 

 Fully describe the calyx, and explain its use to the plants in both 



22. What are the principal modes in which seeds are dispersed ? 

 Describe the mode of dispersal in Gorse, Violet, Willow, Blackberry. 



