Transport in Plants Questions — NEET Biology

Q1

Water potential is equal to

A ψs + O.P.

B ψs = T.P.

C ψp + ψw

D ψs + ψp

Correct Answer

Option D

Solution

(d) Water potential (ψw) = solute potential (ψs) + pressure potential (ψp).

Q2

A bottle filled with moistened mustard seeds and water blew up after half an hour. The phenomenon involved is

A diffusion

B imbibition

C osmosis

D d.P.D.

Correct Answer

Option B

Solution

(b) Imbibition: seeds absorb water and swell, developing enormous imbibition pressure.

Q3

Water potential in the leaf tissue is negative during

A excessive transpiration

B low transpiration

C excessive absorption

D guttation

Correct Answer

Option D

Solution

(d) During guttation (high humidity, low transpiration), water potential becomes more negative as root pressure pushes water out.

Q4

With increase in the turgidity of a cell surrounded by water the wall pressure will

A increase

B decrease

C fluctuate

D remain unchanged

Correct Answer

Option A

Solution

(a) Wall pressure = turgor pressure (equal and opposite); turgidity increases → wall pressure increases.

Q5

The water potential and osmotic potential of pure water are

A zero and zero

B 100 and 100

C zero and 100

D 100 and zero

Correct Answer

Option A

Solution

(a) Pure water: water potential = 0; osmotic potential = 0 (no solutes).

Q6

Water potential of actively absorbing cells is

A always +ve

B always -ve

C always 0.0

D always >0

Correct Answer

Option B

Solution

(b) Actively absorbing cells have negative water potential (lower than surrounding water).

Q7

When water moves through a semi permeable membrane then which of the following pressure develops?

A O.P.

B S. P

C T.P.

D W. P

Correct Answer

Option C

Solution

(c) Turgor pressure develops as water enters the cell by osmosis, pushing against the cell wall.

Q8

Two cells A and B: A has OP 10, TP 7, DPD 3 atm; B has OP 8, TP 3, DPD 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.

Correct Answer

Option C

Solution

(c) Water moves from lower DPD (A=3) to higher DPD (B=5) → A to B.

Q9

When a fresh-water protozoan with contractile vacuole is placed in marine water, the vacuole will

A increase in number

B disappear

C increase in size

D decrease in size

Correct Answer

Option D

Solution

(d) Marine water is hypertonic → exosmosis → contractile vacuole decreases in size.

Q10

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

A Potassium influx and efflux

B Starch hydrolysis

C Guard cell photosynthesis

D Transpiration

Correct Answer

Option A

Solution

(a) Most valid: K+ influx (opening) and efflux (closing) regulate guard cell turgor.