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Question

Each plant or group of plants have 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?


Solution

Cycas is the relic of past. Cycas is an evergreen plant which looks like a palm. It has unbranched stem and large compound leaf. it exhibit phylogenetic relationship with pteridophyte. its evolutionary characters are

(i) Slow growth.

(ii) Shedding of seed when he embryo is still immature.

(iii) Little secondary growth and manoxylic wood.

(iv) Leaf like megasporophyllus.

(v) Flagellate sperms even when pollen tube is present.

(vi) Persistent leaf bases.

(vi) Circinate plysix.

(vii)  Arrangement of microsporangia is well defined archegonia.

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