Question

Place the ruler on the stage of microscope, focus on it using the adjustment knob and observe the diameter of the circular field of view through the eyepiece and measure it in mm.

Convert the diameter from mm to micrometre (µm). Suppose the diameter of the visible field is 5 mm, meaning 5 × 1000 = 5000 µm.

Assertion (A): The compartments seen by Robert Hooke in cork were living cells full of cytoplasm. Reason (R): Cork is made of dead cells, so Hooke saw only empty boxes surrounded by walls.