Q. Read the following statements and choose the correct answer from the options given below
A) In the absence of casparian strips, plants are unable to control amount of water and solute it absorbs
B) Guttation is generally occur during low atmospheric humidity and plentiful soil water
C) Role of $Na^{+}$ in stomatal opening is universally accepted
D) In CAM, plant stomatal remains open in day and night
Explanation
According to the active $K^{+}$ theory of Levitt, there is influx of $K^{+}$ in the guard cell from epidermal cells, which are balanced $by\ Cl^{-}$. At present, the role of $K^{+}$ in stomatal opening in universally accepted. In CAM plants, stomata remains closed during day time $e.g.,$ Opuntia, pineapple etc. Casparian strips present in the walls of endodermal cells control the amount of water and solute, which is absorbed, by the plants, CAM plants have capacity to store $CO_{2}$ during night and the same is used in photosynthesis during day time when stomata are closed
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.