Category : 7th Class
Plants have evolved in such a way that their root system remains in contact with soil and shoot system remains in contact with atmosphere. Thus plants get all the required material from a single place and need not have to move. But animals have to move from place to place in order to get food and shelter. Movement in animals demands an improved transport system. When animals move fast, rate of their energy consumption increases by great extent. For the fast production of energy in the cells, cells required a fast transportation of required materials. Therefore, animal body requires a more efficient and evolved transport system, whose rate of transportation can be increased or decreased according to the body requirement.
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