THE PLANT WORLD. 117 



31. Describe f Phyllotoxy. 

 82. Prove that Flowers are Altered Branches. 

 33. How are Flowers Cross-Fertilized? 

 84. What is the function of Chlorophyll? 

 35. Write upon Plant Work and Movement." 

 The answers are as follows: Of course those of 27 to 33 are 

 drawings and not reproduced. 



1. An embryo is a plant as it is in the seed. It generally shows 

 the cotyledons and stem. 



2. To germinate is to grow from the seed. A plant germinates 

 when placed under favorable conditions, the embryo bursts forth from 

 the seed and begins to grow. 



3. The node is the place on the stem of a plant where flowers and 

 branches are produced. 



4. 71ie axil is the joint where the flower or branch is joined to the 

 the stem. 



5. The term hypogaeous is used when a plant comes from a seed 

 with which the cotyledons remain under the ground. 



6. The endosperm is the albuminous matter within a seed which 

 supplies nourishment to the young plant when it first begins to grow 

 and before it is able to obtain nourishment itself. 



7. A bud is an undeveloped flow^er or branch. A flower bud con- 

 tains all the parts wrapped up within it. A leaf bud is a bundle of 

 leaves rolled toijether. 



9. Growth is the producing of flowers, seeds, fruit, leaves, 

 branches, etc., and a preparing for the winter season. 



9. A secondary root is one which comes from the stem. 



10. Parasites are plants which live on other living plants. Some 

 attach themselves to the trunk of a tree and derive their nourishment 

 from within the trunk. Others fasten themselves to the underground 

 roots of trees. 



11. Winter annuals. 



12. Tendrils are leaves or brant-iies altered so as to be able to 

 fasten themselves to other objects in order to hold the plant. They 

 fasten themselves either by disks or l)y twining around the object. 



13. A peltate leaf is one which has numerous little holes in itself. 



14. A leaflet is one of the parts of a compound leaf. 



15. Phyllodia is the term used when a petiole broadens and be- 

 comes leaf-like in form. 



