71.The Indian scientist whose name is associated with the measurement of growth in plants is

72.The velocity of light was measured by

73.Who among the following first discarded the theory of spontaneous creation and gave that life originates from pre-existing life ?

74.Archaeopteryx is a fossil which provides an evidence of evolution of

75.The clouds of cosmic dust and gases from which the entire solar system is believed to be formed by condensation, is called