Define disaese.

Define disasters.

Define stem.

Define seed.

Define relative permittivity OR what is relative permittivity? OR Define dielectric constant of medium. OR Define specific inductive capacity.

Define biodivesity.

Define Genus.

Define Elastic body. Define Elastic.

Define with diagram. Define principle focus of the convex mirror with diagram.

Define with diagram. Define radius of curvature of a spherical mirror with suitable diagram.

Define Biopatent.