Question 1: Palette 1/38

NEET 2023 MCQ

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 :

A

(A), (C), (D) only

B

(B), (C), (D) only

C

(A), (B), (C) only

D

(A), (B), (D) only

Question 2: Palette 2/38

NEET 2023 MCQ

During symport two different molecules move across the membrane :

A

in same direction with the help of different carriers located at a common site

B

in same direction with the help of different carriers located at different sites in the same cell

C

in same direction with the help of same carrier

D

in opposite direction with the help of same carrier

Question 3: Palette 3/38

NEET 2023 MCQ

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 :

A

Statement I is correct but Statement II is incorrect.

B

Statement I is incorrect but Statement II is correct.

C

Both Statement I and Statement II are correct.

D

Both Statement I and Statement II are incorrect.

Question 4: Palette 4/38

NEET 2023 MCQ

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

A

Facilitated Diffusion

B

Passive Transport

C

Active Transport

D

Osmosis

Question 5: Palette 5/38

NEET 2023 MCQ

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 :

A

Both Statement I and Statement II are incorrect

B

Statement I is correct but Statement II is incorrect

C

Statement I is incorrect but Statement II is correct

D

Both Statement I and Statement II are correct

Question 6: Palette 6/38

NEET 2023 MCQ

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:

A

A and D only

B

A, B and D only

C

B and C only

D

B, C and E only

Question 7: Palette 7/38

NEET 2023 MCQ

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 :

A

A – IV, B – III, C – II, D – I

B

A – III, B – I, C – IV, D – II

C

A – II, B – I, C – IV, D – III

D

A – II, B – IV, C – I, D – III

Question 8: Palette 8/38

NEET 2022 MCQ

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

A

root pressure

B

size of the stomatal aperture

C

distribution of stomata on the upper and lower epidermis

D

cohesion and adhesion between water molecules

Question 9: Palette 9/38

NEET 2022 MCQ

Which of the following is not observed during apoplastic pathway?

A

Movement of water occurs through intercellular spaces and wall of the cells

B

The movement does not involve crossing of cell membrane

C

The movement is aided by cytoplasmic streaming

D

Apoplast is continuous and does not provide any barrier to water movement

Question 10: Palette 10/38

NEET 2022 MCQ

Addition of more solutes in a given solution will:

A

raise its water potential

B

lower its water potential

C

make its water potential zero

D

not affect the water potential at all

Question 11: Palette 11/38

NEET 2021 MCQ

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.

A

(a)	(b)	(c)	(d)
(ii)	(i)	(iv)	(iii)

B

(a)	(b)	(c)	(d)
(ii)	(iv)	(i)	(iii)

C

(a)	(b)	(c)	(d)
(iv)	(iii)	(ii)	(i)

D

(a)	(b)	(c)	(d)
(iii)	(i)	(iv)	(ii)

Question 12: Palette 12/38

NEET 2020 MCQ

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

A

Transpiration

B

Root pressure

C

Imbibition

D

Plasmolysis

Question 13: Palette 13/38

NEET 2019 MCQ

Xylem translocates:

A

Water, mineral salts and some organic nitrogen only

B

Water, mineral salts, some organic nitrogen and hormones

C

Water only

D

Water and mineral salts only

Question 14: Palette 14/38

NEET 2018 MCQ

Stomatal movement is not affected by

A

O₂ concentration

B

temperature

C

CO₂ concentration.

D

light

Question 15: Palette 15/38

NEET 2017 MCQ

The water potential of pure water is

A

less than zero

B

more than zero but less than one

C

more than one

D

zero

Question 16: Palette 16/38

NEET 2017 MCQ

Which of the following facilitates opening of stomatal aperture?

A

Decrease in turgidity of guard cells

B

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

C

Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

D

Contraction of outer wall of guard cells

Question 17: Palette 17/38

NEET 2016 MCQ

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?

A

Acidic

B

Alkaline

C

Low refractive index

D

Absence of sugar

Question 18: Palette 18/38

NEET 2015 MCQ

Root pressure develops due to

A

passive absorption

B

active absorption

C

increase in transpiration

D

low osmotic potential in soil.

Question 19: Palette 19/38

NEET 2015 MCQ

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

A

lignification of xylem vessels

B

positive root pressure

C

dissolved sugars in water

D

tensile strength of water.

Question 20: Palette 20/38

NEET 2015 MCQ

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

A

Starch hydrolysis

B

Guard cell photosynthesis

C

Transpiration

D

Potassium influx and efflux

Question 21: Palette 21/38

NEET 2015 MCQ

Transpiration and root pressure cause water to rise in plants by

A

pushing it upward

B

pushing and pulling it, respectively

C

pulling it upward

D

pulling and pushing ir, respectively.

Question 22: Palette 22/38

NEET 2015 MCQ

In a ring girdled plant

A

the shoot and root die together

B

neither root nor shoot will die

C

the shoot dies first

D

the root dies first.

Question 23: Palette 23/38

NEET 2013 MCQ

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

A

Transport saturation

B

Uphill transport

C

Requirement of special membrane proteins

D

High selectivity

Question 24: Palette 24/38

NEET 2011 MCQ

Guttation is the result of

A

diffusion

B

transpiration

C

osmosis

D

root pressure.

Question 25: Palette 25/38

NEET 2011 MCQ

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

A

cytoskeleton

B

mitochondria

C

endoplasmic reticulum

D

chloroplasts

Question 26: Palette 26/38

NEET 2010 MCQ

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?

A

A $ \to $ Epidermal Cell , B $ \to $ Subsidiary cell, C $ \to $ Stomatal aperture, D $ \to $ Guard cell

B

A $ \to $ Subsidiary cell, B $ \to $ Epidermal Cell , C $ \to $ Guard cell, D $ \to $ Stomatal aperture

C

A $ \to $ Guard cell, B $ \to $ Stomatal aperture, C $ \to $ Subsidiary cell, D $ \to $ Epidermal Cell

D

A $ \to $ Epidermal Cell , B $ \to $ Guard cell, C $ \to $ Stomatal aperture, D $ \to $ Subsidiary cell

Question 27: Palette 27/38

NEET 2009 MCQ

Guard cells help in

A

transpiration

B

guttation

C

fighting against infection

D

protection against grazing

Question 28: Palette 28/38

NEET 2008 MCQ

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

A

weak gravitational pull

B

transpiration pull

C

lignified thick walls

D

cohesion and adhesion.

Question 29: Palette 29/38

NEET 2007 MCQ

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 be

A

no movement of water

B

equilibrium between the two

C

movement of water from cell A to B

D

movement of water from cell B to A.

Question 30: Palette 30/38

NEET 2006 MCQ

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

A

cytoplasmic streaming

B

root pressure and transpiration pull

C

P-proteins

D

mass flow involving a carrier and ATP.

Question 31: Palette 31/38

NEET 2005 MCQ

Potometer works on the principle of

A

osmotic pressure

B

amount of water absorbed equals the amount transpired

C

root pressure

D

potential difference between the tip of the tube and that of the plant.

Question 32: Palette 32/38

NEET 2003 MCQ

Stomata of a plant open due to

A

influx of potassium ions

B

efflux of potassium ions

C

influx of hydrogen ions

D

influx of calcium ions.

Question 33: Palette 33/38

NEET 2002 MCQ

Main functional of lenticel is

A

transpiration

B

guttation

C

gaseous exchange

D

bleeding.

Question 34: Palette 34/38

NEET 2002 MCQ

Opening and closing of stomata is due to the

A

hormonal change in guard cells

B

change in turgor pressure of guard cells

C

gaseous exchange

D

respiration.

Question 35: Palette 35/38

NEET 2001 MCQ

Passive absorption of minerals depends on

A

temperature

B

temperature and metabolic inhibitor

C

metabolic inhibitor

D

humidity.

Question 36: Palette 36/38

NEET 2001 MCQ

Loading of phloem is related to

A

increase of sugar in phloem cell

B

elongation of phloem cell

C

separation of phloem parenchyma

D

strengthening of phloem fiber.

Question 37: Palette 37/38

NEET 2001 MCQ

Glycolate induces opening of stomata in

A

presence of oxygen

B

low CO₂ concentration

C

high CO₂

D

CO₂ absent.

Question 38: Palette 38/38

NEET 2000 MCQ

The movement of ions against the concentration gradient will be

A

active transport

B

osmosis

C

diffusion

D

all of the above.