(b) Draw a wheat or barley spikelet showing (1) outer 

 glume, (2) flowering glume, (3) awn. 



RYE 

 SPIKELET 



BARLEY 

 SPIKELET 



WHEAT 

 SPIKELET 



WHEAT HEAD 



Conclusion : In what way does the wheat or barley head 

 differ from the oat head? .... 



How does the size or shape of the head influence the yield? 



36 



