Gymnosperms

Gymnosperms.

 The classification of  Gymnosperms into 4 phyla :  

 i. Phylum Coniferophyta (Pinus sp.)  
 ii. Phylum Cycadophyta (Cycas sp.)  
 iii. Phylum Ginkgophyta (Ginkgo sp.)  
 iv. Phylum Gnetophyta (Gnetum sp.)     

UNIQUE CHARACTERISTICS

•  Seed is not enclosed within ovary 
•  Reproductive organ : cone consist of the sporophylls that are spirally arranged.
•  Sporophyte is dominant 
•  Leaves with a waxy coating : To help conserve water
•  Ovules contain the female gametophyte
•  Water is not required during fertilization
•  vascular tissue 
• – Xylem : tracheid
• – Phloem : sieve tube  
•  *except for Gnetophyta

CLASSIFICATION OF GYMNOSPERMS.

i) Phylum Coniferophyta (eg: Pinus sp.)

 

 

 

 

 



ii)  Phylum Cycadophyta: Cycas sp.

 

 

iii)  Phylum Ginkgophyta: (Ginkgo sp.)

iv) Phylum Gnetophyta (eg: Gnetum sp.)