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NEET • BIOLOGY • TRANSPORT IN PLANTS

Transport in plants practice · Hard

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Showing 1-30 of 37 questions

1 Hard

1 of 37

Remembering +4 | -1

Herbaceous plants have only about ____% of its fresh weight as dry matter?

View answer and explanation

Correct option: A

10 – 15

Option A is correct because herbaceous plants typically have a high water content, with only about 10-15% of their fresh weight being dry matter.

2 Hard

2 of 37

Understanding +4 | -1

The path of water from soil upto secondary xylem is

View answer and explanation

Correct option: A

Soil

\to

Root hair cell wall

\to

Cortex

\to

Endodermis

\to

Pericycle

\to

Protoxylem

\to

Metaxylem

Option A (Soil

\to

Root hair cell wall

\to

Cortex

\to

Endodermis

\to

Pericycle

\to

Protoxylem

\to

Metaxylem) is correct because it represents the correct sequence of water movement from the soil to the xylem.

3 Hard

3 of 37

Remembering +4 | -1

Osmosis is the diffusion of

View answer and explanation

Correct option: A

Water

Option A (Water) is correct because osmosis is specifically the diffusion of water across a semi-permeable membrane from a region of high water potential to a region of low water potential.

4 Hard

4 of 37

Application +4 | -1

Two cell (A and B) have osmotic potential and pressure potential – 18 bars and 8 bars, and – 14 bars and 2 bars respectively. What will be the direction of water flow?

View answer and explanation

Correct option: A

From cell A to cell B

Option A (From cell A to cell B) is correct because water moves from higher water potential to lower water potential. Water potential of A is -10 and B is -12.

5 Hard

5 of 37

Analyzing +4 | -1

Identify true and false statements and select the correct option from the codes given below
I. As suction pressure increases, water absorption also increases which in turn increases the absorption of ions
II. Absorption of ions is affected by transpiration pull
III. Large amount of charged particles are absorbed along with absorption of water
IV. Pressure flow hypothesis depends entirely on the existence of mechanism for loading sugars into phloem at the source region and unloading it at the sink
V. Contents in the sieve tube move undirectionally

View answer and explanation

Correct option: A

I, II, III and IV are true while V as false

Option A is correct because it accurately identifies the truthfulness of the statements regarding water and ion absorption and the pressure flow hypothesis.

6 Hard

6 of 37

Remembering +4 | -1

Water loss in form of liquid droplets is

View answer and explanation

Correct option: D

Guttation

Option D (Guttation) is correct because guttation is defined as the loss of liquid water in the form of droplets from plants.

7 Hard

7 of 37

Understanding +4 | -1

If a cell increases in volume when kept in a solution, the solution must be?

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Correct option: A

Hypotonic

Option A (Hypotonic) is correct because a hypotonic solution has a lower solute concentration than the cell, causing water to move into the cell.

8 Hard

8 of 37

Understanding +4 | -1

If some solute is dissolved in purewater, its water potential?

View answer and explanation

Correct option: C

Decreases

Option C (Decreases) is correct because dissolving solutes in pure water lowers the water potential, making it more negative.

9 Hard

9 of 37

Understanding +4 | -1

Bulk flow in plants is due to?

View answer and explanation

Correct option: C

Both 1 and 2

Option C (Both 1 and 2) is correct because bulk flow in plants can be driven by both positive (e.g., root pressure) and negative (e.g., transpiration pull) pressure gradients.

10 Hard

10 of 37

Understanding +4 | -1

Pressure potential in thistle funnel develop?

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Correct option: D

After the entry of water in the thistle funnel

Option D (After the entry of water in the thistle funnel) is correct because pressure potential develops as water enters the thistle funnel due to osmosis, increasing the pressure inside.

11 Hard

11 of 37

Understanding +4 | -1

The function of companion cells is to

View answer and explanation

Correct option: D

Load sucrose into sieve elements by active transport

Option D (Load sucrose into sieve elements by active transport) is correct because companion cells actively transport sucrose into sieve tube elements using energy.

12 Hard

12 of 37

Understanding +4 | -1

A girdled tree may survive for some time but it will eventually die because?

View answer and explanation

Correct option: C

Sugars and other organic materials will not move downwards

Option C is correct because girdling removes the phloem, which is responsible for transporting sugars and other organic materials downwards from the leaves.

13 Hard

13 of 37

Understanding +4 | -1

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:

View answer and explanation

Correct option: B

Both processes can happen together because the diffusion coefficient of water and

C{O_2}

is different

Option B (Both processes can happen together because the diffusion coefficient of water and

C{O_2}

is different) is correct because the diffusion of water vapor and carbon dioxide are independent processes influenced by their respective concentration gradients and diffusion coefficients.

14 Hard

14 of 37

Understanding +4 | -1

Water potential is more when?

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because water potential increases when solvent molecules are more abundant, solute molecules are less abundant, and when water potential is less negative (closer to zero).

15 Hard

15 of 37

Remembering +4 | -1

Difference between OP and TP is known as

View answer and explanation

Correct option: A

Suction pressure

Option A is correct because the difference between osmotic pressure (OP) and turgor pressure (TP) is known as suction pressure, which represents the water absorption capacity of a cell.

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16 Hard

16 of 37

Understanding +4 | -1

Assertion (A): The more the solute molecules in a solution, The lower (more negative) is the solute potential of solution.

Reason (R): For a solution at atmoshperic pressure, water potential equal to solute potential.

View answer and explanation

Correct option: B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

Option B (Both (A) and (R) are true and (R) is not the correct explanation of (A)) is correct because both the assertion and the reason are true statements, but the reason does not explain the assertion.

17 Hard

17 of 37

Understanding +4 | -1

Which is not short distance transport?

View answer and explanation

Correct option: C

Phloem transport

Option C (Phloem transport) is correct because phloem transport is a long-distance transport mechanism, while the others are short-distance.

18 Hard

18 of 37

Analyzing +4 | -1

Assertion: On the top of the water, oil will form
a film affecting the amount of light entering the
water.

Reason: Oil is a polar molecule, and forms
hydrogen bonds.

View answer and explanation

Correct option: C

If Assertion is true but Reason is false

Option C (If Assertion is true but Reason is false) is correct because oil does form a film on water, but it's due to its non-polar nature, not hydrogen bonding.

19 Hard

19 of 37

Understanding +4 | -1

The value of osmotic potential of an electrolyte is always

View answer and explanation

Correct option: A

More than non electrolyte

Option A (More than non electrolyte) is correct because electrolytes dissociate into more particles in solution, leading to a greater osmotic effect.

20 Hard

20 of 37

Application +4 | -1

Two adjacent cells A and B are being studied. Cell A has OP of 10 atm and TP of 6 atm. Cell B has OP of 10 atm occurs from?

View answer and explanation

Correct option: A

Cell A to cell B

Option A (Cell A to cell B) is correct because water moves from a region of higher water potential to a region of lower water potential.

21 Hard

21 of 37

Understanding +4 | -1

As the solute concentration in a solution increases, the change that does not occurs is

View answer and explanation

Correct option: C

{\psi _s}

becomes more positive

Option C (

{\psi _s}

becomes more positive) is correct because as solute concentration increases, the solute potential becomes more negative, not positive.

22 Hard

22 of 37

Understanding +4 | -1

The correct relationship among different type of soil water is

View answer and explanation

Correct option: B

Hollard = Chresard + Echard

Option A (Chresard = Echard + Hollard) is incorrect, Option B (Hollard = Chresard + Echard) is correct because total soil water (Hollard) is the sum of available water (Chresard) and unavailable water (Echard).

23 Hard

23 of 37

Application +4 | -1

If a cell A with D.P.D. 4 bars is connected to cell B, C, D whose O.P. and T.P. are respectively 4 and 4, 10 and 5 and 7 and 3 bars, the flow of water will be:

View answer and explanation

Correct option: C

B to A, C and D

Option B (B to A, C and D) is correct because water moves from areas of lower DPD to areas of higher DPD.

24 Hard

24 of 37

Remembering +4 | -1

The most accepted theory for ascent of sap is?

View answer and explanation

Correct option: A

Transpiration pull and cohesion tension theory of Dixon and Jolly

Option A (Transpiration pull and cohesion tension theory of Dixon and Jolly) is correct because it is the most widely accepted theory for the ascent of sap.

25 Hard

25 of 37

Remembering +4 | -1

Water is absorbed on colloidal molecules by

View answer and explanation

Correct option: B

Imbibition

Option B (Imbibition) is correct because imbibition is the process by which colloidal molecules absorb water, causing them to swell.

26 Hard

26 of 37

Understanding +4 | -1

Transpiration and root pressure cause water to rise in plants by?

View answer and explanation

Correct option: C

Pulling and pushing it respectively

Option C (Pulling and pushing it respectively) is correct because transpiration creates a pulling force from the leaves, while root pressure generates a pushing force from the roots.

27 Hard

27 of 37

Understanding +4 | -1

Which of the following may move across the plasma membrane by the process of simple diffusion?

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Correct option: C

Neutral solutes

Option C (Neutral solutes) is correct because simple diffusion favors small, nonpolar, and uncharged molecules that can easily pass through the hydrophobic core of the plasma membrane.

28 Hard

28 of 37

Understanding +4 | -1

Ascent of sap is best explained by?

View answer and explanation

Correct option: D

Cohesion – tension transpiration pull.

Option D (Cohesion – tension transpiration pull) is correct because the cohesion-tension transpiration pull theory best explains the ascent of sap in plants.

29 Hard

29 of 37

Analyzing +4 | -1

Solute potentials and pressure potentials of three solution

\mathrm{A, B}

and

\mathrm{C}

are as follows:

\begin{aligned} & \Psi_{\mathrm{s}}(\mathrm{A})=-7 \text { bar, } \Psi_{\mathrm{s}}(\mathrm{B})=-11 \text { bar, } \Psi_{\mathrm{s}}(\mathrm{C})=-5 \text { bar } \\ & \Psi_{\mathrm{p}}(\mathrm{A})=5 \text { bar, } \Psi_{\mathrm{p}}(\mathrm{B})=8 \text { bar, } \Psi_{\mathrm{p}}(\mathrm{C})=3 \text { bar } \end{aligned}

On the basis of given data select the incorrect statement.

View answer and explanation

Correct option: D

All the solutions A, B and C are isotonic with respect to each other

Option D (All the solutions A, B and C are isotonic with respect to each other) is the incorrect statement because isotonic solutions have the same water potential, which is not the case for solutions A, B, and C.

30 Hard

30 of 37

Understanding +4 | -1

Which part of cell imbibe water?

View answer and explanation

Correct option: D

1 and 2

Option D (1 and 2) is correct because both the cell wall and cell sap can imbibe water due to their hydrophilic nature.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 37 single-correct-answer MCQs on TRANSPORT IN PLANTS.
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