Question

Which one is best to reduce the rate of water absorption and also acts as a respiratory inhibitor?
A. IAA
B. КСМ
C. Transpiration
D. Osmotic pressure of cell sap

Answer 1

Hint: The substances which prevent respiration, from occurring are called respiratory inhibitors, some of them prevent the movement of electrons in the electron transport chain, and some prevent the exchange of protons through intermembrane space.

Complete answer:
Indole acetic acid (IAA): It is one of the auxins which is produced within the plant, and it has so many functions in plants, and it mainly produces in the root tips and shoots tips of the plants, it predominately produces in the young stage of the plants, especially in the apex, that is shoot bud and they travel in a plant in the direction of the growth, and it can prevent the transpiration, which in turn prevent the rate of water absorption and it also Inhibits the rate of respiration in plants, by preventing the flow of electrons in the electron transport chain.
KCN: It is potassium cyanide is one of the respiratory inhibitors, it mainly inhibits the respiration by inhibiting the movement of electrons from complex to complex so the transport of electrons in the electron transport chain is ceased and the respiration is inhibited, but it does not play any role in water absorption, so it is the wrong answer.
Transpiration is the process of loss of water through aerial parts of the leaves is called transpiration, it is directly proportional to the amount of water absorption, so it is the wrong answer.
The osmolarity of the sap helps the movement of solvents from a low concentration gradient to a high concentration gradient, it is the wrong answer.

So the correct answer is option A.

Note:
The plants produce food by photosynthesis and utilize them for energy, and most of them are carbohydrates, and in order to produce energy the substance should undergo metabolism, and phosphorylation is required to produce energy products.