One of the endangered species of Indian medicinal plants is

$A$ satellite is revolving very close to a planet of density $\rho$. The period of revolution of the satellite is

Two small spheres,each having an equal positive charge $Q$ (Coulomb),are suspended by two insulating strings of equal length $L$ (metre) from a rigid hook. The whole setup is taken into a satellite where there is no gravity. The two balls are now held by electrostatic forces in a horizontal position. The tension in each string is then:

If $u=e^{x^2-y^2}$,then

Which group of organisms was the first to exist on Earth among the given options?

The complex formed by a pair of synapsed homologous chromosomes is called: