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

NEET-2023 Transport-in-Plants [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:

NEET-2023 Transport-in-Plants [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

NEET-2023 Transport-in-Plants [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 ?

NEET-2022 Transport-in-Plants [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:

NEET-2022 Transport-in-Plants [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:

NEET-2022 Transport-in-Plants [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.

NEET-2021 Transport-in-Plants [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:

NEET-(Sept)2020 Transport-in-Plants [class-xi ]

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

Remark:

Select the incorrect statement.

NEET-(Oct)2020 Transport-in-Plants [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:

NEET-2019 Transport-in-Plants [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: