Question

why is pteridophyta called as vascular amphibians of plant kingdom?

Answer 1

Because these plants doesn't complete their life cycle without water

Answer 2

Pteridophyta is called the vascular amphibians of plant kigdom this is because they need water for fertilisation but they contains vascular

System hence,they are called vascular amphibian

BUT

In case of bryophyta they are called amphibians of the plant kigdom this is because the also need water for fertilisation but the do not contains vascular system , so they are called amphibians only

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