8th Class Science Sample Paper Science Sample Paper-3

  • question_answer                                                                                                   Discuss various systems of irrigation.         



    The supply of water to crops at different intervals is called irrigation.
    Various systems of irrigation are:
    (i) Traditional methods: The water available in wells, lakes and canals is lifted up by:
    (a) Moat (Pulley system)
    (b) Chain pump
    (c) Dhekli and;
    (d) Rehat (Lever system)
    Pumps are commonly used for lifting water.                                                                                   
    (ii) Modern methods:
    (a) Sprinkler system: This system is more useful on uneven land and with sandy soil. The perpendicular pipes, having rotating nozzles on top, are jointed to the main pipeline at regular intervals. When water flows through main pipes, it gets sprinkled on the crop as if it is raining.
    (b) Drip system: In this system, water falls drop by drop just at the position of the roots. It is the best technique for watering fruit plants, garden and trees.      


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