What are the essentials of a good herbarium?

What is herbarium?

What are essential amino acids?

What are the charactersticks of a good unit?

What are the essential and accessory whorls in flower?

How do you prepare your own herbarium sheets? What are the different tools you carry with you while collecting plants for the preparation of a herbarium? What information should a preserved plant material on the herbarium sheet provide for taxonomical studies?

What are the conditions for obtaining good interference pattern ?

(a) What is the essential condition for Rayleigh scattering ? (b) In Rayleigh scattering, how is intensity of scattered light related to wavelength of light ?

Which factors are essential to maintaining health?

What is most essential for propagation of mechanical wave?