Monday, 5 January 2015

What led to the origin of plants?

                       ORIGIN OF PLANTS



                            It is believed that there was a time when there were no plants on the Earth . According to the scientists , the protoplasm , the living material that is found in both plants and animals , appeared on the Earth in the form of tiny specks , hundreds of millions of years ago.  





                         These protoplasm specks that became plants had one cell in the beginning and it is only later , they formed groups of cells . they grew in water and we call them 'algae'. 


 


algae


                    Most of the plants that we find today are evolved from algae . But there are some which came out of sea and developed rootlets which could anchor them in the soil , along with little leaves . These plants are called as mosses and ferns   



Mosses


Ferns
Tree fern 
                    Earlier , the reproduction in plants was either by simple cell division or by means of spores , little dust like cells resembling seeds . In course of time , some of these plants developed flowers that produced true seeds and thus the process goes on in the nature .






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