Science (086) — CBSE Class 10 board question

Steps to culture yeast in the laboratory:

1. Dissolve about 10 g of sugar in 100 mL of water.
2. Take 20 mL of this solution in a test tube and add a pinch of yeast granules to it.
3. Plug the mouth with cotton and keep in a warm place for 1–2 hours.
4. Place a drop of the culture on a slide, cover with a coverslip, and observe under a microscope.

Source: Chapter 7, Activity 7.1

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Examiners expect the four sequential steps from Activity 7.1 — sugar solution preparation, adding yeast, incubation in a warm place, and microscopic observation. Writing them as a numbered list is ideal for a 2-mark answer. Avoid adding extra biology; just reproduce the activity steps concisely.