Question

A living cell can be best studied by the means of
A) Dark field microscope.
B) Electron microscope
C) Phase-contrast microscope.
D) Compound microscope.

Answer 1

Hint: Cells are the structural and functional unit of life, where they are microscopic in nature where they cannot be seen through the naked eye, and they be observed under the microscope only, after the discovery of microscope, Antony Van Leeuwenhoek was the person who observed the living cells that are present in his mouth scraping under the microscope.

Complete answer:
There are different varieties of microscopes which were used to see various types of cells.
Previously the living cells were identified and observed under the light microscope, but as the cell is translucent, staining is important to observe the structure and nature of the cell, and the electron microscope also helps to observe the living cells with little high resolution compared to light microscope.
But it was difficult because staining kills the cell, so the observation of the living cell under the microscope became easy after the discovery of phase contrast microscopy, the live imagining of living cells was possible with the help of phase contrast microscope.
Phase contrast microscopy was discovered in the year 1940, even the imaging of live cells possible, it is not possible to see some specific proteins under this microscope, later in order to compensate that fluorescent staining was introduced, which enabled them to observe the specific proteins too.

So, the correct option is C.

Note: Living cells are very tiny in size, and it cannot be observed through the naked eye, so they should be seen in microscope, but the living cells are translucent in nature and they cannot be appreciated properly, unless it is stained, but best observation and study can be done by using phase contrast microscope.