20 SEEDS : STRUCTURE AND GERMINATION 



leaves arranged one inside the other. Just at the point where 

 the root joins the cotyledon there is a thickening which marks 



Fig 6 — i. Section of an Onion seed. 2. Germination of same. 



3. Young seedling. 4 and 5. Same as 3, but some days 



older. In 3 and 5 a secondary root is seen. 

 a Radicle and primary root ; c cotyledon ; J slit in cotyledon 



from which the first foliage-leaf of the seedling emerges ; b 



endosperm of seed. 



the place where the plumule is situated within, and at a short 



