Explain the process of secondary growth in stems of woody angiosperm with help of schematic diagrams. What is the significance?

Explain the electrolytic refining of copper with the help of a diagram .

What is meant by secondary growth? Which are its type ?

A transverse section of the trunk of a tree shows concentric rings which are known as growth rings. How are these rings formed ? What is the significance of these rings?

Discuss the main feature of a domestic wiring system with the help of a schematic diagram of one of the common domestic circuits .

Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of the brushes ?

To observe the growth of fungus-Rhizopus on the piece of bread. Apparatus : Petridish, Magnifying glass. Material : Wet slice of bread. Procedure : rarr Wet a slice of bread in water. Now put the wet plece of bread in petridish. Keep the petridish in dark, moist and cool environment for a week. rarr Now observe the bread slice with help of magnifying glass. What is seen on the slice of bread ?

What is meant by secondary growth ? Explain formation of cambial ring.