Which are the lamps that are mostly used ? Why ?

The transition metals are mostly

Suppose you have to replace an incandescent lamp at your house. Following lamps are available. Incandescent lamp, CFL, LED, Fluroscent lamp Which of these lamps would you select ?Justify your selection.

Why are the hydrocarbons used as fuel?

Sugar cane, Banana ,Ginger and Onion are following plants. But these are mostly cultivated by vegetative propagation. Can you identify which part of above plants are used for vegetative propagation.

Incandescent lamp, discharge lamp , C.F.L, LED lamp, arc lamp are given for observation . Answer the following questions after observing them. Which metal is used to make filament of an incandescent lamp ? What are the advantages of using this metal as a filament ?