" c) Explain working of a hand lens with help of a diagram."

Explain the zones of candle with the help of a diagram .

Answer the following : Explain the construction and working of a kaleidoscope with the help of a diagram .

Explain the parts of a leaf with the help of a diagram.

Answer the following : Explain the construction and working of a periscope with the help of a diagram .

Explain the anatomy of testis with the help of a diagram.

Explain biofuel production with the help of a diagram

What is a soundboard? Explain the working of a soundboard with the help of a labelled diagram.