With the help of labelled diagrams, depict the stages of the germination of microspore and development of male gametophyte.

Long Answer Questions Five mark Each QUESTIONS FROM STATE BOARD EXAMINATIONS : With the help of labelled diagrams, depict the stages of microspore maturing into a pollen grain.

With the help of a labelled diagram describe the structure of lungs.

With the help of a labelled diagram, describe double fertilization in plants.

With the help of labelled diagram, give the principle, construction and theory of cylotron.

With the help of labelled circuit diagram, explainthe working of transistor as a switch.

What is an electric oscillator ? With the help of labelled diagram, explain the use of junction transistor as.an oscillator.