170 



PLANTS AND MAN 



the seed proper (fig. 102) and consists of an embryo, which occu- 

 pies about 6% of the seed, a relatively large endosperm region 



B 



Fig. 102. — The fruit and seed coats of wheat form the husk or bran; the 

 remainder is the seed proper, consisting of embryo and a large portion of stored 

 food or endosperm. A, grain from embryo side; B, cross section above region of 

 embryo; C, cross section at embryo region. 



ABC D E F 



Fig. 103. — Of the numerous types of wheat, the most common include emmer 

 (A), einkorn (B), spelt (C), durum (D), club (E) and bread (F). 



rich in starch (85% of the seed) and an aleurone layer of cells 

 with stored protein food, making up about 4% of the grain. 



