Which one of these groups of invertebrate animals includes organisms with pharyngeal gill slits?

During embryonic development in the eumetazoa, gastrulation results in

What is the function of gametangia in plants?

A consequence of Einstein’s theory of relativity is:

When light travels from medium X to medium Y as shown:

A cylindrical region of radius R contains a uniform magnetic field parallel to its axis. The field is zero outside the cylinder. If the magnitude of the field is changing at the rate dBdt, the electric field induced at a point 2R from the cylinder axis is:

As a loop of wire with a resistance of 10 Ω moves in a non-uniform magnetic field, it loses kinetic energy at a uniform rate of 5 mJ/s. The induced emf in the loop is:

Two point charges are arranged as shown. In which region could a third charge +1 C be placed so that the net electrostatic force on it is zero?

A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is repelled away from the rod we can conclude:

The diagram shows a particle with positive charge Q and a particle with negative charge -Q. The electric field at point P on the perpendicular bisector of the line joining them is: