306 MONOCOTYLEDONS. 



in Barley, the awn of which twists and untwists when one breathes on 

 it, and causes the grain to creep up one's sleeve. The awns of some 

 foreign Grasses have arrangements for becoming attached to animals, 

 for burying the grain in the soil, and in some cases for wind-dispersal 

 as well (e.g. Stipa). 



QUESTIONS ON CHAPTER XII. 



1. Describe, with sketches, the structure of a resting Crocus corm. 



2. Give a clear account, from your own observations, of the events 

 which occur from the time a resting Crocus corm is placed in moist 

 soil or sawdust, up to the time when the leaves die down. Include 

 the changes that occur below as well as above the soil, and give a 

 series of sketches. 



3. For how many days does a Crocus flower last, from the time 

 when it first opens ? 



4. Describe observations and experiments you have made on the 

 opening and closing of the Crocus flower. 



5. What other flowers with which you are familiar open and close 

 like the Crocus flower ? 



6. Draw a floral diagram of any flower belonging to the Order 

 Iridaceae, and describe fully its pollination. Name the chief points of 

 difference in the structure of such a flower and a tulip flower. 



7. Describe the structure of the flower of Bluebell, and compare it 

 with that of a Garden Hyacinth. 



8. What other flowers besides those of Bluebell droop when they 

 open ? How is the drooping caused ? Can you explain why so many 

 spring flowers either droop or have the power to open and close? 

 Give a list of spring flowers which droop and of those which perform 

 opening and closing movements. 



9. Describe, from your own observations and dissections, the struc- 

 ture of a Garden Hyacinth bulb. Sketch, on a large scale (about 

 twice the natural size), a longitudinal section made through the centre 

 of a bulb, marking all the parts sliuwn. 



10. Describe and explain the structure of a Narcissus bulb, with the 

 smaller bulbs attached to it. How is it that some scales go round the 

 whole set of bulbs ? 



11. Describe carefully all you saw when growing a Hyacinth bulb 

 in soil, sawdust, or water, arid explain the things you saw. Give 

 sketches. 



