TROPICAL AGRICULTURE 



CHAP. 



Therequi- GERM I NATION.- When placed under favourable condi- 

 sit*s of tions, the embryo begins to grow into the plant, and this 

 vital action is called germination. 



B 



FIG. a. 



FIG. i. 



STAGES IN THE GERMINATION OF A BEAN. 



FIG. i. A. Cotyledons. B. Plumule developing leaves. C. Radicle developing 



roots. 

 FIG. 2. A. A. Cotyledons. B. B. Leaves developed from the Plumule. 



C. Roots developed from the Radicle. D. D. Outer envelope of seed. 



E. Inner envelope of seed. 



The necessary conditions for germination are three, 

 namely, the presence of moisture, warmth and air, and 



