40 BIOLOGY FOR BEGINNERS 



Corn ("Kernel" is the true fruit). 

 External structure. 



Seed coats covered by fruit coats. 

 Hilum and micropyle hidden. 

 Items to be located. 



Point of attachment to cob, at narrow end. 

 Embryo mark on side. 

 Silk scar at broad end. 

 Internal structure. 



Endosperm, large much stored starch, proteid, oil. 

 Embryo. 



Cotyledon, one, oval, against the endosperm, used to digest and 



transmit food, has ferments for digestion. 

 Hypocotyl, protective cap, points to attached end of seed. 

 Plumule, protective cap, rolled leaves, adapted for piercing soil. 

 Cob, the stem of flower spike. 

 Chaff, outer flower parts. 

 Kernel, the fruit. 



Silk, the pistil for catching pollen. 

 Husks, leaves for protection. 



