EXERCISE 32 



It has been noted that seeds will start to grow with practically no food from the outside. All that 

 is necessary is water, air, and suitable temperature. We have noted the large seed leaves in certain 

 seeds (bean, pea), and also the endosperm, the great mass of food stored outside the cotyledon in the corn. 



Problem. Do these structures, the cotyledons and the endosperm, 

 have anything to do with the growth of the seedling ? 



What to use. Different kinds of very young seedlings ; vessels of water. 



What to do. After the seeds have germinated, remove varying por- 

 tions of the cotyledon in different seedlings, from none to the whole. 



Remove varying portions of the endosperm, from none to the whole. 



Return to bottles or pan of water and record results in form of table. 



Conclusion. What seems to be the relation of the cotyledons or endosperm to the growth of seedlings? 



[37] 



