INTERRELATIONS OF PLANTS AND ANIMALS 135 

 BALANCED AQUARIUM 



b. Relations between Green Plants and Animals (The 

 Energy Relation) 



Observations. 1. Study Figure 39 carefully. Just what 

 forms the food material of plants possessing chlorophyll ? 



2. What forms the food of animals and plants without 

 chlorophyll ? 



3. What becomes of the food mentioned in No. 2 ? 



4. What are the bacteria of decay ? 



Carbon dioxide 

 I (C0 2 ) 



Water \ 



\(H 2 0) 



Simple Salts 



Ammoniaj 

 CNHsT 



Plants 



with chlorophyll 



build up complex 



organic substances 



They store up 



energy from the sun 



in the process 



and. 



Carbon dioxide 



A (C0 2 ) 



Animals 

 and plants without 



Water 

 X(H 2 0) 



, chlorophyll 



m . which tear down complgz Ammonia 

 organic substances ] (NH 3 ) 

 and set free energy 

 in the process in 

 form of heat 



f food of 



Energy from su;n. 



as heat. 



FIG. 39. Relations between green plants and animals. (After Colton.) 



Energy set free 

 as heat. 



Conclusions. 1. How are plants able to store up energy ? 

 What finally becomes of it ? 



2. What is the energy relation between plants and animals 

 as shown above ? 



