Transport in Plants

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...

During symport two different molecules move across the membrane :

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 differ...

Match List I with List II :

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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...

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 coolin...

Movement and accumulation of ions across a membrane against their concentration gradient can be
explained by

The ascent of xylem sap is plants in mainly accomplished by the

Addition of more solutes in a given solution will:

Which of the following is not observed during apoplastic pathway?

Match List-I with List-II :
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The process responsible for facilitating loss
of water in liquid form from the tip of grass
blades at night and in early morning is

Xylem translocates:

Stomatal movement is not affected by

The water potential of pure water is

Which of the following facilitates opening of stomatal aperture?

A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?

Which one gives the most valid and recent explanation for stomatal movement?

Transpiration and root pressure cause water to rise in plants by

In a ring girdled plant

A column of water within xylem vessels of tall trees does not break under its weight because of

Root pressure develops due to

Which of the following criteria does not pertain to facilitated transport?

In land plants, the guard cells differ from other epidermal cells in having

Guttation is the result of

Given below is the diagram of a stomatal apparatus.
In which of the following all the four parts labelled
as A, B, C and D are correctly identified?

Guard cells help in

The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of

Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will...

The translocation of organic solutes in sieve tube members is supported by

Potometer works on the principle of

Stomata of a plant open due to

Opening and closing of stomata is due to the

Main functional of lenticel is

Glycolate induces opening of stomata in

Passive absorption of minerals depends on

Loading of phloem is related to

The movement of ions against the concentration gradient will be