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A cell is placed in 0.4 M solution of sugar and no change in volume of cell is found. What is the concentration
of the cell sap?
(1) 40 M
(2) 4 M
(3) 0.4 M
(4) 0.20 M

When solute potential increases then water potential would
(1) Increase
(2) Decrease
(3) Remain same
(4) First increase then decrease

The hydrostatic pressure which develops due to entry of water into a plant cell is
(1) Positive
(2) Negative
(3) Zero
(4) Undetermined

What would be Ψ${}_{\mathrm{p}}$ of cell sap in cell-A and cell-B respectively?

(1) 300, 400 kPa
(2) –300, –400 kPa
(3) –1100, –1600 kPa
(4) 900, 600 kPa

Ions are absorbed from the soil by
(1) Passive transport
(2) Active transport
(3) Both (1) & (2)
(4) Imbibition

Correct expression for water potential of plasmolysed cell will be
(1) ψ${}_{\mathrm{w}}$ = ψ${}_{\mathrm{s}}$
(2) ψ${}_{\mathrm{s}}$ = ψ${}_{\mathrm{p}}$
(3) ψ${}_{\mathrm{w}}$ = 0
(4) ψ${}_{\mathrm{w}}$ = ψ${}_{\mathrm{s}}$ + (– ψ${}_{\mathrm{p}}$ )

A hypothetical arrangement of plant cells (A, B, C, and D) is given below

Find the correct sequence of movement of water using the given values
(1) D → B → C → A
(2) A → C → B → D
(3) D → B → A → C
(4) D → A → C → B

Which of the following statement for hydathodes is correct?
(1) Opens to release excessive pure water from leaves
(2) Contains a loosely arranged parenchyma called epithem
(3) These are found at the tips of the veins in leaves
(4) More than one option is correct

In a stomatal apparatus, cellulosic microfibrils are oriented
(1) Longitudinally on subsidiary cells
(2) Radially in the cell walls of guard cells
(3) Radially and longitudinally in wall of guard cells
(4) Longitudinally on both guard cells

Stomatal movement is not affected by 
(1) Temperature
(2) Light
(3) CO₂ concentration
(4) O₂ concentration

Which of the following facilitates opening of stomatal aperture? 
(1) Contraction of outer wall of guard cells
(2) Decrease in turgidity of guard cells
(3) Radial orientation of cellulose microfibrils in the cell wall of guard cells
(4) Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

The water potential of pure water is 
(1) Zero
(2) Less than zero
(3) More than zero but less than one
(4) More than one

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? 
(1) Acidic
(2) Alkaline
(3) Low refractive index
(4) Absence of sugar

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 one of following options
(1) One process occurs during day time, and the other at night
(2) Both processes cannot happen simultaneously
(3) Both processes can happen together because the diffusion coefficient of water and CO2 is different
(4) The above processes happen only during night time

Root pressure develops due to 
(1) Increase in transpiration
(2) Active absorption
(3) Low osmotic potential in soil
(4) Passive absorption

A column of water within xylem vessels of tall trees does not break under its weight because of
1. Positive root pressure
2. Dissolved sugar in water
3. Tensile strength of water
4. Lignification of xylem vessels

Transpiration and root pressure cause water to rise in plants by 
(1) Pushing and pulling it, respectively
(2) Pulling it upward
(3) Pulling and pushing it, respectively
(4) Pushing it upward

In a ring-girdled plant 
1. Neither root nor shoot will die
2. The shoot dies first
3. The root dies first
4. The shoot and root die together

Which one gives the most valid and recent explanation for stomatal movements? 
(1) Guard cell photosynthesis
(2) Transpiration
(3) Potassium influx and efflux
(4) Starch hydrolysis

Which of the following criteria does not pertain to facilitated transport? 
(1) High selectivity
(2) Transport saturation
(3) Uphill transport
(4) Requirement of special membrane proteins

Lenticels are involved in 
(1) Gaseous exchange
(2) Food transport
(3) Photosynthesis
(4) Transpiration

Guttation is the result of 
(1) Osmosis
(2) Root pressure
(3) Diffusion
(4) Transpiration

Which one of the following structures between two adjacent cells is an effective transport pathway?
(1) Plasmalemma
(2) Plasmodesmata
(3) Plastoquinones
(4) Endoplasmic reticulum

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?

(1) A – Subsidiary cell                 (2) A – Guard cell
B – Epidermal cell                             B – Stomatal aperture
C – Guard cell                                  C – Subsidiary cell
D – Stomatal aperture                      D – Epidermal cell
(3) A – Epidermal cell                  (4) A – Epidermal cell
B – Guard cell                                  B – Subsidiary cell
C – Stomatal aperture                      C – Stomatal aperture
D – Subsidiary cell                           D – Guard cell

Guard cells help in: 
(1) Transpiration
(2) Guttation
(3) Fighting against infection
(4) Protection against grazing

The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of 
(1) Transpiration pull
(2) Lignified thick walls
(3) Cohesion and adhesion
(4) Weak gravitational pull

Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure - 7atm 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:
(1) Movement of water of Cell A to B
(2) Movement of water from Cell B to A
(3) No movement of water
(4) Equilibrium between the two

The translocation of organic solutes in sieve tube members is supported by : 
(1) Root pressure and transpiration pull
(2) P-proteins
(3) Mass flow involving a carrier and ATP
(4) Cytoplasmic streaming

Potometer works on the principle of 
(1) Amount of water absorbed equals the amount transpired
(2) Osmotic pressure
(3) Root pressure
(4) Potential difference between the tip of the tube and that of the plant

When water enters in roots due to diffusion, it is termed as
(1) Osmosis
(2) Passive absorption
(3) Endocytosis
(4) Active absorption