Transport in Plants · Biology · NEET
MCQ (Single Correct Answer)
Which of the following helps in maintenance of the pressure gradient in sieve tubes?
Identify the correct statements regarding Mass flow hypothesis.
(A) Mass flow is faster than diffusion.
(B) Mass flow is the result of pressure difference between the end points.
(C) Different substances involved in mass flow move at different paces.
(D) Mass flow can result through either a positive or a negative hydrostatic pressure gradient.
Choose the correct answer from the options given below :
During symport two different molecules move across the membrane :
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:
Match List I with List II :
| List I | List II | ||
|---|---|---|---|
| (A) | Cohesion | (I) | More attraction in liquid phase |
| (B) | Adhesion | (II) | Mutual attraction among water molecules |
| (C) | Surface tension | (III) | Water loss in liquid phase |
| (D) | Guttation | (IV) | Attraction towards polar surfaces |
Choose the correct answer from the options given below :
The ascent of xylem sap is plants in mainly accomplished by the
Which of the following is not observed during apoplastic pathway?
Addition of more solutes in a given solution will:
| List-I | List-II | ||
|---|---|---|---|
| (a) | Cohesion | (i) | More attraction in liquid phase |
| (b) | Adhesion | (ii) | Mutual attraction among water molecules |
| (c) | Surface tension | (iii) | Water loss in liquid phase |
| (d) | Guttation | (iv) | Attraction towards polar surfaces |
Choose the correct answer from the options given below.
