what is YARAVIRUS

What is matter? what is diffusion?

What is music and what is noise?

What is physics? What is the origin of the word physics? What is its Sanskrit equivalent?

What is lanthanoid contraction? What is its cause and what ar its consequences ?

(A) What are Casparian strips and what is their function ? (B) Define concentric vascular bundle. What are their types ? (C) What is wood botanically ?