RErRODrCTION 205 



569. Wliat color i)r('vails in uiirii)(' I'ruif ? l^xijlaiu. 



570. Why is green such an unconunou coh^r among ripe berries? 



571. Fleshy fruits usually have stony seeds or a stony layer around 

 the seed. Explain. 



572. Of what use to the plant is the fleshy food stored in such a fruit 

 as that of the apple? 



573. The flower stalks of the dandelion elongate after the seeds have 

 l)cen formed. Of what advantage is this to the plant? 



574. As a general rule, how tall are plants in which the fruit bears 

 hooks or similar structures? 



575. Just what part of the seed develops into the new plant? 



576. Why does cracking or chipping the shell of a hard-shelled fruit 

 or seed often hasten its germination when planted? 



REFERENCE PROBLEMS 



86. What relation has there lieen between tlie evolutionary historj' of 

 insects and of flowers? 



87. What flowers are there which depend on flics rather than on liees 

 for pollination? How do they differ from bee flowers? 



88. Does a bee visit all kinds of flowers, one after the other, on the same 

 day, or does he confine himself to one species? Explain the importance to 

 plants of this behavior. 



89. Some varieties of strawberries will set seeds when planted by them- 

 selves. Others will not. Explain. 



90. One corn stalk alone in a field is apt to produce few or no seeds. 

 Why? 



91. Cucumbers and melons will not fruit naturally in greenhouses, at 

 least in winter. Why not? 



92. What is Xenia? Of what economic importance is it? 



93. Give examples (other than those in the text) of a capsule, a ])0(1, an 

 achene, a nut, a grain, a berry, a drupe, and a pome. 



94. Name three cultivated fruits which are csseutially seedless. 



95. Give the derivation of the following terms and explain in what way 

 each is appropriate: 



Calyx Petal Hypocotyl 



Corolla Stamen Micropyle 



Perianth Pistil Cotyledon 



Sepal Ovule Plunuile 



