Question

Active K’ change mechanism for opening and closing of the stomata was given by:
A. Darwin
B. Levitt
C. Scarth
D. Khorana

Answer 1

Hint:-The guard cells control the opening and closing of the stomata by regulating the turgor pressure in them. Due to the absorption of water, the guard cells get to swell which roots the opening of stomatal pores. However, after a while, the shrinking of guard cells takes place which in turn leads to the end of the pores. Thus, one can say that the opening and closing of stomata ensues due to changes occurring in guard cells due to turgor pressure applied to them.

Complete answer:
- In the year of 1974, the scientist Levitt gave a theory on which includes a revised form of the assembly of stomatal movement which is normally called the hypothesis of proton - potassium pump. He explained the transportation of potassium ions into the guard cells in the presence of light.
- The theory of Starch Sugar Interconversion is given by the scientist Sayre in the year of 1926. However, it was supported by the scientist Scarth in the year of 1932.
- According to the theory, the stomata open in neutral or alkaline ph. That is why it prevails in the duration of daytime; it is only due to the presence of constant removal of carbon dioxide by photosynthesis.
- The scientists Nirenberg and Khorana together encoded the genetic encryption of the organisms. However, the scientist Holley sequenced and presumed the edifice of the first transfer RNA molecule.
- The theory of evolution through natural selection is first formulated in Darwin’s book called “On the Origin of Species” in the year of 1859.
Thus, the answer is Levitt.

Note:- One of the important macronutrients for plants is potassium. The turgor movement of guard cells is caused by Potassium ions. A decrease in the water potential of guard cells is rooted since there is a gain of potassium ions. In turn, this led to the inflow of water into the guard cells. This varies the guard cells turgid and makes them swell.