Given below are two statements :
Statement I : The process of translocation through phloem is unidirectional but through xylem, it is bidirectional.
Statement II : The most readily mobilized elements are phosphorus, sulphur, nitrogen and potassium.
In the light of the above statements, choose the most appropriate answer from the options given below :
Movement and accumulation of ions across a membrane against their concentration gradient can be explained by
Given below are two statements :
Statement I : The forces generated transpiration can lift a xylem-sized column of water over 130 meters height.
Statement II : Transpiration cools leaf surfaces sometimes 10 to 15 degrees evaporative cooling.
In the light of the above statements, choose the most appropriate answer from the options given below :
Identify the correct statements:
A. Lenticels are the lens-shaped openings permitting the exchange of gases.
B. Bark formed early in the season is called hard bark.
C. Bark is a technical term that refers to all tissues exterior to vascular cambium.
D. Bark refers to periderm and secondary phloem.
E. Phellogen is single-layered in thickness.
Choose the correct answer from the options given below: