Pyramid

Ecological pyramids are of I. three types (age pyramids, energy pyramids and biomass pyramids). II. four types (age pyramids, energy pyramids, number pyramids and biomass pyramids). III. five types ((age pyramids, energy pyramids, number pyramids, tropical pyramids and biomass pyramids). Select the statements with the correct option.

Right pyramid a pyramid is said to right pyramid if the perpendicular dropped from the vertex on the base meets the base at its central point i.e. the centre of the inscribed or circumscribed circle. In other words the vertex of the pyramid lies on the perpendicular to the base drawn through its centre. Otherwise the pyramid is called an oblique prism.