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Transport in Plants: Class-XI


Previous Year Questions (PYQs)

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MCQs on Transport in Plants: Class-XI for NEET Practice


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

[class-xi ]

  • Active Transport
  • Osmosis
  • Facilitated Diffusion
  • Passive Transport
  • Correct Option: A  [ Active Transport ]

    Remark:

Given below are two statements:
Statement I: The forces generated by transpiration can lift a xylem-sized column of water over 130 meters height.
Statement II: Transpiration cools leaf surfaces sometimes 10 to 15 degrees, by evaporative cooling.
In the light of the above statements, choose the most appropriate answer from the options given below:

[class-xi ]

  • Statement I is incorrect but Statement II is correct.
  • Both Statement I and Statement II are correct.
  • Both Statement I and Statement II are incorrect
  • Statement I is correct but Statement II is incorrect.
  • Correct Option: B  [ Both Statement I and Statement II are correct. ]

    Remark:

Match List-I with List-II

List-I List-II
(A)Cohesion (I)More attraction in liquid phase
(B)Adhesion (II)Mutual attraction among wate 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:

[class-xi ]

  • A-II, B-I, C-IV, D-III
  • A-II, B-IV, C-I, D-III
  • A-IV, B-III, C-II, D-I
  • A-III, B-I, C-IV, D-II
  • Correct Option: B  [ A-II, B-IV, C-I, D-III ]

    Remark:

Which of the following is not observed during apoplastic pathway ?

[class-xi ]

  • Movement of water occurs through intercellular spaces and wall of the cells
  • The movement does not involve crossing of cell membrane
  • The movement is aided by cytoplasmic streaming
  • Apoplast is continuous and does not provide any barrier to water movement
  • Correct Option: C  [ The movement is aided by cytoplasmic streaming ]

    Remark:

“Girdling Experiment” was performed by Plant Physiologists to identify the plant tissue through which:

[class-xi ]

  • water is transported
  • food is transported
  • for both water and food transportation
  • osmosis is observed
  • Correct Option: B  [ food is transported ]

    Remark:

Addition of more solutes in a given solution will:

[class-xi ]

  • raise its water potential
  • lower its water potential
  • make its water potential zero
  • not affect the water potential at all
  • Correct Option: B  [ lower its water potential ]

    Remark:

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:

[class-xi ]

  • A-IV, B-III, C-II, D-I
  • A-III, B-I, C-IV, D-II
  • A-II, B-I, C-IV, D-III
  • A-II, B-IV, C-I, D-II
  • Correct Option: D  [ A-II, B-IV, C-I, D-II ]

    Remark:

The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is:

[class-xi ]

  • Transpiration
  • Root pressure
  • Imbibition
  • Plasmolysis
  • Correct Option: B  [ Root pressure ]

    Remark:

Select the incorrect statement.

[class-xi ]

  • Transport of molecules in phloem can be bidirectional.
  • Movement of minerals in xylem is unidirectional.
  • Unloading of sucrose at sink does not involve the utilization of ATP.
  • Elements most easily mobilized in plants from one region to another are: phosphorus, sulphur, nitrogen and potassium.
  • Correct Option: C  [ Unloading of sucrose at sink does not involve the utilization of ATP. ]

    Remark:

Xylem translocates:

[class-xi ]

  • Water only
  • Water and mineral salts only
  • Water, mineral salts and some organic nitrogen only
  • Water, mineral salts, some organic nitrogen and hormones
  • Correct Option: D  [ Water, mineral salts, some organic nitrogen and hormones ]

    Remark: