Answer:
When onion cells are treated with iodine dye, certain changes in their features can be observed. Iodine is commonly used in microscopy to stain biological samples, making it easier to observe certain structures and features. Here are some changes that can be observed in onion cells when treated with iodine:
Nucleus: The nucleus of the onion cells becomes more prominent and can be seen more clearly under the microscope. This is because iodine reacts with the DNA in the nucleus, staining it a dark brown color.
Cell wall: The cell wall of the onion cells also becomes more visible under the microscope when treated with iodine. This is because iodine reacts with the cellulose in the cell wall, staining it a yellowish-brown color.
Vacuole: The vacuole of the onion cells can also be observed more clearly when treated with iodine. The vacuole is an organelle that stores water and other substances, and when stained with iodine it appears as a dark brown or reddish-brown color.
Overall, the use of iodine dye in microscopy can help to highlight certain structures and features of onion cells, making it easier to study their morphology and function.
Step-by-step explanation: