Which part of a touchscreen responds to pressure applied to its surface?
digitizer
inverter
oled panel
system board

Digitizer  is used to respond the pressure applied to the surface of touch screen.

Explanation:

In cell phone or smartphone, a piece of glass is placed just behind the LCD to sense and respond the touch on the screen. When we touch or swipe the screen, an electrical screen is produced by applying pressure on LCD. The electrical signal is in analog form, digitizer convert this signal into digital signal. After conversion the signal has been processed and responded in the form of operation that we want to perform through touch screen.

yes we can change both the color of the value of a cell as well as background color of a cell at the same time .

as we know that excel sheet consists of columns and rows.

and intersection of column and row is called cell.

we can change color of the cell and background of the cell at the same time.

hence the statement that

can a person change color of the cell and background of the cell at the same time is true.