Sugar Solution of Yeast Under the Microscope



The correct answer is option 'D', which states that a chain of yeast cells is present when a lukewarm sugar solution of yeast is examined under a microscope after a day. Let's explore this answer in detail:

Yeast and Sugar Solution


- Yeast is a microorganism that belongs to the fungi kingdom.
- It is commonly used in baking and brewing due to its ability to ferment sugar and produce carbon dioxide and alcohol.
- Sugar is a nutrient source for yeast, providing energy for its metabolic processes.

Microscopic Observation


When a lukewarm sugar solution of yeast is observed under a microscope after a day, the following observations can be made:

1. Presence of Yeast Cells
- The presence of yeast cells is expected as yeast is added to the sugar solution.
- Yeast cells are single-celled microorganisms that appear as small oval or round structures under the microscope.
- They can be observed as individual cells or sometimes in clusters.

2. Chain Formation
- In favorable conditions, yeast cells have the ability to form chains or clusters.
- This occurs due to a process called budding, where a new yeast cell grows as an outgrowth from the parent cell.
- Over time, these budding cells remain attached to the parent cell, resulting in the formation of chains or clusters of yeast cells.
- These chains can be observed as a characteristic arrangement of yeast cells under the microscope.

3. Absence of Bacteria
- Bacteria are separate microorganisms that are distinct from yeast.
- In a sugar solution of yeast, the presence of bacteria would be considered a contamination.
- Therefore, the absence of bacteria is expected in a properly prepared sugar solution of yeast.

Conclusion


When a lukewarm sugar solution of yeast is examined under a microscope after a day, the presence of yeast cells is observed, and specifically, a chain of yeast cells can be seen. This chain formation is a characteristic feature of yeast cells and occurs due to the budding process. The absence of bacteria is expected in a properly prepared sugar solution of yeast.