Map the following traits onto the cladogram of land plants P

Map the following traits onto the cladogram of land plants (Plantae) below. A Origin of vascular tissue B Origin of seeds C Alternation of generations D Origin of apical meristem E Shift in the life cycle from 1N to 2N as the dominant stage

Solution

The below answer is given on the basis on the names of the species as numbered in the cladogram: 1. Liverworts, 2. Hornworts, 3. Mosses, 4. Lycophytes, 5. Pterophytes, 6. Gymnosperm, 7. Angiosperm.

A. Origin of vascular tissue:

This occured around 420 mya.

It started from 4. Lycophytes till 7.Angiosperm. it started from the formation of xylem and pholem in the plants.

B. Orgin of seed:

This trait about 360 mya.

Origin of seeds are the traits that are present in 6. Angiosperm and 7. Gymnosperm.

C. Alternations of generation:

This trait occurred around 475 mya

This trait has been developed from the 1. Liverworts till 7. Gymnosperm.

Alternation of generation is the fluctuations between haploid and diploid stages in life cycle.

D. Origin of apical meristem:

This trait develop from 475 mya.

This occurred from 1. Liverworts till 7. Gymnosperm.

E. Shift in the life cycle from 1N to 2N as the dominant stage:

This trait develop from 475 mya.

This occurred from 1. Liverworts till 7. Gymnosperm.