Josey wants to look at the cells of an onion under a light microscope. she peels off a thin, transparent layer of onion and places it on a microscope slide. josey places the sample on the microscope stage, looks through the eyepiece, and adjusts the stage to focus the image. however, she is unable to see any details of the cells.
which of the following possible solutions could possibly josey to see the onion cells in detail?
a. josey should use a thicker piece of onion for her sample.
b. josey should place her onion sample in a vacuum.
c. josey should place a drop of water on her sample.
d. josey should apply a stain, such as iodine, to her sample.

D

Explanation:

Staining allows for visualization of cells and its organelles under a microscope because cells in their natural form are either transparent or translucent.  There are different staining techniques depending on the type of microscope being used, the type of cell being visualized, identification of cells, and etcetera. In this case iodine is used because it is well taken by starch molecule in the onion cells hence increasing visualization of the cell.

The possible solution that Josey can employ that will make her see the details of the onion cell under a microscope is: D. Josey can apply a stain to her sample, such as iodine.

Most cells and cell structures appear translucent if you try viewing them with a microscope in their natural form. They are not transparent.

To make these cells and their organelles transparent when viewing under a microscope, different staining techniques are usually employed, depending on the type of cells and the microscope being used.

Onion cells can be made transparent under a microscope if it is stained with iodine.

Therefore, the possible solution that Josey can employ that will make her see the details of the onion cell under a microscope is: D. Josey can apply a stain to her sample, such as iodine.

Learn more here:

link

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.