'-" NUTRITION. 



3. Symbiosis between an annual and a plant: specimen of an Acacia leaf 

 showing :- 



() Hollow thorns in which symbiotic ants live ; 



(b) Protein food-bodies at the tips of the leaflets ; 



(c) Nectary for providing carbohydrate food. 

 In addition examine the specimen of an ant. 



3a. Symbiosis between an animal and a plant : transverse section of a green Hydra. 

 showing symbiotic alga 1 inside the endoderm cells. 



