Abstract: All the four fundamental forces of nature have been explained in terms of space time. Coupling constant of grand unification has been defined by space time. The density of space time calculated by ‘Siva’s classical equation for space time’ describes the nature of fundamental force. Thus for all fundamental forces, there exist a separate universe with a separate space time and a separate ‘maximum signal velocity’. The transformation has been explained as an expansion of a single universe for which maximum signal velocity is ‘velocity of light’. This transformation affects the concept of consciousness. Thus all other forms of space times explained as different forces of nature within the limitations of consciousness. Thus ‘Bio-Force’ defined as a form of space time like all other fundamental forces and considered as a fifth fundamental force. Consciousness is an affect of interactions of ‘Bio-Force’. Coupling Constants for ‘gravity’ and ‘Bio field’ have been calculated by space time concept and concerned maximum signal velocities. For other three forces strong force, electromagnetic force and weak forces, the space time has been defined by their coupling constants. All these calculations have been done by one single equation Vd=K. With this equation, space time parameters for all fundamental forces have been explained. The conclusions described grand unification of all five natural forces in a different way which has been extended to ‘Bio-Force’, an important aspect of consciousness.Abstract: All the four fundamental forces of nature have been explained in terms of space time. Coupling constant of grand unification has been defined by space time. The density of space time calculated by ‘Siva’s classical equation for space time’ describes the nature of fundamental force. Thus for all fundamental forces, there exist a separate universe wi...Show More