Who and how discovered the cell for the first time?

Who observed cell division for the first time ?

Who discovered vaccine for small pox for the first time?

Who studied the physiology of heart for the first time?

Who discovered the cell and what was the book written by him ?

Sameer wants to observe Rhizopus under microscope. For this i) What are preparatory activities he has to do? ii) What procedure does he follow? And iii) What precautions should he take?

Pushpa wants to conduct an experiment to know whether the starch is present in given leaf or not. For this, a) what apparatus does she require ? b) what procedure does she follow ? c) what precautions does she need to take ?

What are the gum yielding trees in your surroundings ? What procedure should you follow to collect gum from trees?

Which of the following is not correct? (a) Robert Brown discovered the cell. (b) Schleiden and Schwann formulated the cell theory. (c) Virchow explained that cells are formed from pre-existing cells. (d) A unicellular organism carries out its life activities within a single cell.