Below is an image of a preparation of garlic root tip. There are 38 cells in the field of view.

Calculate the mitotic index for this tissue sample and select the correct answer from the options below.

Question

Below is an image of a preparation of garlic root tip. There are 38 cells in the field of view.

Calculate the mitotic index for this tissue sample and select the correct answer from the options below.

BlackTom AI · Accepted Answer

First, determine what the mitotic index represents: it is the fraction of cells undergoing mitosis in a given field, calculated as (number of mitotic cells) / (total number of cells observed).

From the image, there are 38 cells in the field of view, so the denominator is 38.

Next, count how many cells are in mitosis. In this sample, 5 cells appear to be in mitotic stages (visible condensed chromosomes typical of mitosis).

Now compute the mitotic index: 5 mitotic cells ÷ 38 total cells = 5/38 ≈ 0.1316.

Rounding to three significant figures gives 0.132.

Evaluating the other options:
- 0.053 would correspond to about 2 mitotic cells (0.053 × 38 ≈ 2), which does not match the observed count of 5.
- 0.079 would correspond to about 3 mitotic cells (0.079 × 38 ≈ 3), again not matching the observed 5.
- 5 as a standalone value would be the absolute count, not a ratio or index; mitotic index is a fraction, not a raw count, so this is not appropriate.

Thus, the value 0.132 accurately reflects the mitotic index calculated from 5 mitotic cells out of 38 total cells.

AGRI10051_2025_SM2 Practical 1 Post-prac Test

Below is an image of a preparation of garlic root tip. There are 38 cells in the field of view. Calculate the mitotic index for this tissue sample and select the correct answer from the options below.

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