What is this instrument? How you use this?

What is this instrument ? How do you use this ?

What is the instrument do you use to see the smallest cells and microorganisms ?

The vernier scale of an instrument has 50 divisions which coincide with 49 main scale divisions. If each main scale division is 0.5 mm, then using this instrument what would be the minimum inaccuracy in the measurement of distance ?

The instrument used to sow seeds is

The vernier scale of an instrument has 50 divisions which coincide with 49 main scale divisions. If each main scale division is 0.5 mm, then using the instrument what would be the minimum inaccuracy in the measurement of distance?

What is Pelvic girdle ? How do you identify it ?

What is a herbarium? How is it useful to us?

What is coal tar? How is it useful to us?