Ijmb Model Questions Vol1 2020 Biology Question 1

A fresh onion (Allium cepa) bulb is used to prepare a temporary squash of an epidermal peel for microscopic observation. The slide is examined under a low‑power objective (40×) and a high‑power objective (100×). The following measurements of five intact parenchyma cells are recorded using an ocular micrometer (1 mm = 100 divisions). The length of each cell (in divisions) is given in the table below. | Cell | Length (divisions) | |------|--------------------| | 1 | 48 | | 2 | 52 | | 3 | 47 | | 4 | 51 | | 5 | 49 | Assume that the width of a cell is half its length and the thickness is one‑fifth of its length. Answer the following questions.