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ESSENTIALS OF ZOOLOGY 



depend on green plants for their organic food. It is derived either 

 directly or indirectly from the process of photosynthesis carried on 

 by green plants to manufacture starch which is stored in plant 

 tissue. Green plants by effect of their chlorophyll (green pigment) 



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eiOOH la KOIXdHOSHT 



in sunlight cause carbon dioxide, a gas of the air, and water to 

 unite in the formation of a simple carbohydrate. This is the basic 

 food material of plants as well as of animals. During daylight hours 

 while photosynthesis is in progress, oxygen is discharged into the 



