With a neat diagram explain the 7-celled,8-nucleate nature of the female gametophyte.

With a suitable diagram explain the process of development of male gametophyte.

What is LED? With neat diagram, explain the construction of a LED.

With the help of neat labelled diagram explain the structure of nucleus.

With a neat diagram, explain the construction Q and working of Fery's black body.

Answer the following questions : With a neat labelled diagram , explain the construction and working of an electric motor.

With a neat labelled diagram explain rainbow formation

With a neat diagram, describe the construction of a photoelectric cell.

Answer the following questions : What is meant by the apparent size of an object ? With a neat and labelled diagram , explain the relation between the apparent size of an object and the angle subtended by the object at the eye .

With the help of a neat diagram, explain reflection of light from a plane reflecting surface on the basis of wave theory of light

Answer the following questions : With a neat labelled diagram , explain the construction and working of a compound microscope .