Question

: To initiate cell photosynthesis salt solution should be
(a) Isotonic
(b) Hypotonic
(c) Hypertonic
(d) None of the above

Answer 1

This is the solution in which the concentration of solute is higher as compared to the concentration of solvent i.e., water as compared to the other solution. water will move towards the solution through the membrane.

Correct step by step answer:
To initiate cell photosynthesis, the salt solution should be hypertonic. That means the concentration of salt in the solution should be higher so that water will enter from outer soil inside the cell and will remain available for the process of photosynthesis.
For the occurrence of photosynthesis, plants need carbon dioxide, water, light, chlorophyll. Carbon dioxide enters through stomata present on the leaf's surface while water is absorbed by root hair cells.
Photosynthesis is a process by which green plants and certain other organisms convert light energy into chemical energy. The light energy absorbed by the green plants is used to convert water, carbon dioxide, and minerals into oxygen and energy- rich organic compounds.
- If the salt solution will be hypertonic then the water rushes inside the cell and initiates the process of photosynthesis.
- If the solution is isotonic then no net movement of molecules occurs due to equal concentration on both sides of the cell.
- If the solution is hypotonic then the movement of molecules occurs from outside to the inside of the cell that means water moves from inside to the outside of the cell.
So, the correct answer is, '(c) Hypertonic'.

Note:
- In a hypertonic solution, the solute concentration is higher and a lower water potential as a result water will move into the hypertonic solution through the membrane.
- The hypertonic solution is most likely to be given in the ICU due to quickly arising side effects of pulmonary edema/fluid overload.