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Give the applications of universal law gravitation.
 
Select the corresponding answer:
  1.  can be measured using the gravitation law. Mass of the Earth, the radius of the Earth, acceleration due to gravity, etc., can be calculated with higher accuracy.
  2. It helps in .
  3. One of the irregularities in the motion of stars is called ‘’ lead to the disturbance in the motion of a planet nearby. In such conditions, the  can be calculated using the law of gravitation. 
  4. It helps to explain germination of roots is due to the property of  which is the property of a root responding to gravity.
  5. It helps to predict the .