<h3><u>Answer;</u></h3>
C) primary cell wall → plasma membrane → cytoplasm → vacuole
<h3><u>Explanation;</u></h3>
- The cell wall is the protective outer layer of a plant cell, that gives the cell strength and structure, and also filters molecules that pass in and out of the cell.
- Cell membrane acts as a semi-permeable barrier separating the inside of the cell from the outside of the cell. The membrane allows regulation of what enters/exits the cell and how quickly.
- Cytoplasm is the jelly-like fluid that fills a cell. It is responsible for giving a cell its shape and also helps to fill out the cell and keeps organelles in their place.
- Vacuoles are membrane-bound sacs within the cytoplasm of a cell that function in several different ways. They functional in providing structural support, as well as serving functions such as storage, waste disposal, protection, and growth.
- <u>Potassium ion from the extracellular environment will move to the cell vacuole via the cell wall, the cell membrane and then via the cytoplasm to the vacuole.</u>
Rydberg formula is given by:
where, 
= Rydberg constant = 
= wavelength
and 
are the level of transitions.
Now, for = 2 and = 6
= 
= 
= 
= 
= 
= 
= 
Now, for = 2 and = 5
= 
= 
= 
= 
= 
= 
Now, for = 2 and = 4
= 
= 
= 
= 
= 
= 
Now, for = 2 and = 3
= 
= 
= 
= 
= 
= 
Construction of dam : scarcity of water for animals
