Question

Each plant or group of plants has some phylogenetic significance in relation to evolution : Cycas, one of the few living members of gymnosperms is called as the ‘relic of past’. Can you establish a phylogenetic relationship of Cycas with any other group of plants that justifies the above statement?

Answer 1

Introduction:

Cycas is called a relic of the past since it was found near old rocks. It is the connecting link between pteridophytes and gymnosperms.

Features of pteridophytes:

The following features are present that establish a phylogenetic relationship of Cycas with pteridophytes:-

● Presence of flagellated antherozoids

● Presence of leaf-like structure of megasporophyll

● Presence of archegonia

● Persistent leaf bases

● Shedding of seed with immature embryo