Define Quiscent centre and chlorenelyma. What is protoderm?

What is quiescent centre.

A compound made up of elements A and B crystallizes in the cubic structures. Atoms A are present on the corners as well as face centres whereas atoms B are present on the edge centres centres as well as body centre. What is the formula of the compound? Draw the structure of its unit cell.

Define : Optical centre and focal length of a lens.

What are quiscent seeds ?

Define activation energy . What is threshold energy ?

Define the term thrust and pressure. What is the relation between them?

Define binding energy of nucleus . What is its source ?

Define electric currents and define its SI units?

Define mechanical equivalent of heat. What is its value?

Define coefficient of thermal conductivity. What is its SI unit ?