TRANSPORT IN PLANTS Q BANK Question and answer based on strictly latest NCERT based pattern, and previous year NEET (AIPMT) question. chapter wise approach mcq is more useful for quick revision and increase speed for maintaining time period.



Q1) Which of the following facilitates opening of stomatal aperture? (NEET 2017)

Contraction of outer wall of guard cells
Decrease in turgidity of guard cells
Radial orientation of cellulose microfibrils in the cell wall of guard cells
Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

Answer- Radial orientation of cellulose microfibrils in the cell wall of guard cells

Q2) The water potential of pure water is (NEET 2017)

Less than zero
More than zero, but less than one
More than one

Answer- Zero

Q3) Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using the following options.  (NEET 2016, PHASE I)

Both processes can happen together because the diffusion coefficient of water & CO₂ is different
The above processes happen only during night time
One process occurs during day time & the other at night
Both processes cannot happen simultaneously

Answer- Both processes can happen together because the diffusion coefficient of water & CO₂ is different

Q4) 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? (NEET 2016, PHASE II)

Low refractive index
The absence of sugar

Answer- Alkaline

Q5) Root pressure develops due to  (CBSE AIPMT 2015)

Active absorption
Low osmotic potential in soil
Passive absorption
Increase in transpiration

Answer- Active absorption

Q6) A column of water within xylem vessels of tall trees does not break under its weight because of  (CBSE AIPMT 2015)

Dissolved sugars in water
Tensile strength of water
Iignification of xylem vessels
Positive not pressure

Answer- Tensile strength of water

Q7) Which of the following criteria does not pertain to facilitated transport?  (NEET 2013)

Requirement of special membrane proteins
High selectivity
Transport saturation
Uphill transport

Answer- Uphil transport

Q8) In land plants, the guard cells differ from other epidermal cells in having  (CBSE AIPMT 2011)

Endoplasmic reticulum

Answer- chloroplasts

Q9) Guard cells help in  (CBSE AIPMT 2009)

Protection against grazing
Fighting against infection

Answer- Transpiration

Q10) The rupture & fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of  (CBSE AIPMT 2008)

Ignified thick walls
Cohesion & adhesion
Weak gravitational pull
Transpiration pull

Answer- Coheson & adhesion

Q11) Two cells A & B are contiguous. Cell A has osmotic pressure 10atm, turgor pressure 7atm & diffusion pressure deficit 3atm. Cell B has osmotic pressure 8atm, turgor pressure 3atm & diffusion pressure deficit 5atm. The result will be (CBSE AIPMT 2007)

Movement of water from cell B-A
No movement of water
Equilibrium between the two
Movement of water from cell A-B

Answer- Movement of water from cell A-B

Q12) The translocation of organic solutes in sieve tube members is supported by (CBSE AIPMT 2006)

Mass flow involving a carrier & ATP
Cytoplasmic streaming
Root pressure & transpiration pull

Answer- Mass flow involving a carrier & ATP

Q13) Stomata of a plant open due to  (CBSE AIPMT 2003)

Influx of hydrogen ions
Influx of calcium ions
Influs of potassium ions
Efflux of potassium ions

Answer- Influx of potassium ions

Q14) Stomata of CAM plants  (CBSE AIPMT 2003)

Open during the night & close during the day
Never open
Are always open
Open during the day & close at night

Answer- Open during the night & close during the day

Q15) Opening & closing of stomata is due to  (CBSE AIPMT 2002)

Hormonal change in guard cells
Change in turgor pressure of guard cells
Gaseous exchange

Answer- Change in turgor pressure of guard cells

Q16) Glycolate induces opening of stomata in  (CBSE AIPMT 2001)

Presence of oxygen
Low CO₂ concentration
High CO₂ concentration
Absence of CO₂

Answer- Low CO₂ concentration

Q17) In which of the following plant sunken stomata are found?  (CBSE AIPMT 2001)


Answer- Nerium

Q18) Water enters a cell due to   (CBSE AIPMT 2001)


Answer- SP

Q19) In soil, water available for roots (to plants) is (CBSE AIPMT 1999,91)

Capillary water
Hygroscopic water
Gravitational water
Chemically bound water

Answer- Capillary water

Q20) The water potential & osmotic potential of pure water are  (CBSE AIPMT 1998)

100 & zero
Zero & zero
100 & 200
Zero & 100

Answer- zero & zero

Q21) If turgidity of a cell surrounded by water increases, the wall pressure will(CBSE AIPMT 1997)

Remain unchanged

Answer- Increase

Q22) Osmotic pressure in the leaf cells is positive during   (CBSE AIPMT 1997)

Excessive transpiration
Low transpiration
Excessive absorption

Answer- Excessive transpiration

Q23) Water entering root due to diffusion is part of (CBSE AIPMT 1996)

Passive absorption
Active absorption

Answer- Passive absorption

Q24) The movement of water from one cell of the cortex to the adjacent one in root is due to   (CBSE AIPMT 1995)

Accumulation of inorganic salts in the cell
Accumulation of organic compounds in the cell
Chemical potential gradient
Water potential gradient

Answer- Water potential gradient

Q25) Which of the following is used to determine the rate of transpiration in plants?  (CBSE AIPMT 1994)


Answer- Potometer

Q26) Some of the growth regulators affect stomatal opening. Closure of stomata is brought about by  (CBSE AIPMT 1994)

Indole butyric acid
Abscisic acid
Gibberelic acid

Answer- Abscisic acid

Q27) Which of the following is an effective adaptation for better gas exchange in plants?  (CBSE AIPMT 1993)

Presence of multiple epidermis
Presence of hair on the lower epidermis
Presence of waxy cuticle covering the epidermis of the leaves
The location of the stomata primarily on the lower surface of the leaf, the side turned away from the direct sun rays

Answer- The location of the stomata primarily on the lower surface of the leaf, the side turned away from the direct sun rays

Q28) The direction & rate of water movement from cell to cell is based on  (CBSE AIPMT 1992)

Incipient plasmolysis

Answer- DPD

Q29) Conversion of starch to organic acid is essential for  (CBSE AIPMT 1992)

Stomatal closure
Stomatal opening
Stomatal initiation
Stomatal growth

Answer- Stomatal opening

Q30) In guard cells when sugar is converted into starch the stomatal pore  (CBSE AIPMT 1992)

Opens fully
Opens partially
Closes completely
Remains unchanged

Answer- Closes completely

Q31) Meaningful girdling (ringing) experiment cannot be performed within sugarcane because  (CBSE AIPMT 1992)

Its phloem is situated interior to xylem
Its stem surface is covered with waxy coating
Its vascular bundles are not present in a ring
Its stem is thin

Answer- Its vascular bundles are not present in a ring

Q32) Guttation is caused by  (CBSE AIPMT 1992)

Root pressure
Osmotic pressure

Answer- Root pressure

Q33) An innovative professor who wanted to give a live demonstration of a physiological process, filled a glass bottle with previously moistened mustard seeds & water. He screwcapped the bottle & kept it away in a corner & resumed his lecture. Towards the end of his lecture there was a sudden explosion with glass pieces of bottle thrown around.
Which of the following phenomena did the professor want to demonstrate?   (CBSE AIPMT 1990)

Anaerobic respiration

Answer- Imbibition

Q34) Mainly condution of water in an angiosperm occurs through (CBSE AIPMT 1990)

Xylem vessels
Sieve tubes
All of these

Answer- Xylem vessels

Q35) Root system in a plant is well developed (CBSE AIPMT 1990)

Due to deficiency of auxins
Due to deficiency of cytokinins
Due to deficiency of minerals
For increased absorption of water

Answer- For increased absorption of water

Q36) In a terrestrial habitat which of the following is affected by temperature & rainfall condition?  (CBSE AIPMT 1989)


Answer- Transpiration

Q37) Basis of stomatal opening is  (CBSE AIPMT 1988)

Decrease in cell sap concentration
Plasmolysis of guard cells

Answer- Endosmosis

Q38) Stomata in angiosperms open & close due to  (CBSE AIPMT 1988)

Their genetic constitution
Effect of hormones
Change of turgor pressure in guard cells
Pressure of gases inside the leaves

Answer- Change of turgor pressure in guard cells

Q39) The spraying of phenyl mercuric acetate in leaves  (CBSE AIPMT 1988)

Increases transpiration
Reduces transpiration
Increases rate of photosynthesis
Causes guttation

Answer- Reduces transpiration