How do plants manufacture their food?

            FOOD MANUFACTURING IN PLANTS

                                    

                                 The plants have 'factories' to manufacture their food and these factories are nothing but leaves . In the case of fruit trees , the leaves acquire carbon dioxide gas from air and the water from soil to prepare their food which is sugar . This process of making food is called " PHOTOSYNTHESIS" .

Photosynthesis equation

                            In the case of those plants , which have no sugar, the food is in the form of starch and proteins . The main apparatus which helps the leaves to manufacture food are the green bodies called " CHLOROPLASTS " and they in turn acquire energy from the sun.

                                                     The roots of the take water from the soil and then the water circulates through the stems and branches and then into the veins of the leaves . These veins carry the food which the leaves have prepared . The leaves do away with their excess carbon dioxide by emitting oxygen , which in turn sustains human life .

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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