• If both the medium and cell has exactly the same water concentration and thus, there will be no net movement of water across the cell membrane is known as an isotonic solution. 
• The cells remain of the same size.
  
  Hence, the correct option is B.

Hypotonic solution is a type of solution in which water concentration in the medium is more than the cell. Water crosses the membrane in both directions, but more water will come into the cell than will leave. The net result is that the water enters the cell. The cells will swell up. 

A hypertonic solution is a particular type of solution that has a greater concentration of solutes on the outside of a cell when compared with the inside of a cell. Water crosses the cell membrane in both directions, but more water leaves the cell than enters it. Therefore, the cell will shrink due to exosmosis.

A hypotonic environment is when the solute concentration outside the cell is less than inside the cell.

Osmosis happens along a concentration gradient. If outside medium is hypotonic, it means that relatively more of water is present outside the cells in the surrounding medium and water will flow inside the root hair cells.

Mitochondria is responsible for manufacturing and supplying chemical energy by releasing energy stored in food molecules and synthesising ATP. It is called the power house of the cell. 

No. of amino acid in one term in α helix = 3.6

Auxospore. In certain species of diatoms, auxospores are specialised cells that are produced at key stages in their cell cycle or life history.  Auxospores can also play a role in sexual reproduction in diatoms, and may be formed after haploid gametes fuse to form a diploid zygote.