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NEET • BIOLOGY • TRANSPORT IN PLANTS

Transport in plants practice · Mixed difficulty

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Showing 31-60 of 344 questions

31 Easy

31 of 344

Understanding +4 | -1

If a stem is girdled

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Correct option: A

Root dies first

Option A (Root dies first) is correct because girdling removes the phloem, which transports sugars from the leaves to the roots. Without sugar, the roots cannot survive, leading to their death first.

32 Easy

32 of 344

Remembering +4 | -1

Stomatal opening is affected by

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Correct option: B

Carbon dioxide concentration, temperature and light

Option B is correct. Stomatal opening is affected by carbon dioxide concentration, temperature, and light.

33 Medium

33 of 344

Understanding +4 | -1

In plants, long distance transport of organic and inorganic substances occur through

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Correct option: B

Complex permanent tissues

Option B (Complex permanent tissues) is correct because xylem and phloem, the complex permanent tissues, are responsible for long-distance transport.

34 Easy

34 of 344

Understanding +4 | -1

Which of the following has maximum water potential?

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Correct option: A

Pure water

Option A (Pure water) is correct because pure water has the highest water potential, defined as zero under standard conditions.

35 Medium

35 of 344

Remembering +4 | -1

Cohesion force, a feature of cohesion theory is also called

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Correct option: A

Tensile a strength

Option A is correct. Cohesion force, a feature of the cohesion theory, is also called tensile strength.

36 Easy

36 of 344

Understanding +4 | -1

Which among the following has highest water potential?

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Correct option: C

Distilled water

Option C (Distilled water) is correct because distilled water has the highest water potential, defined as zero under standard conditions.

37 Medium

37 of 344

Remembering +4 | -1

The evaporative loss of water from the exposed part of plant is called

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Correct option: A

Transpiration

Option A (Transpiration) is correct because it is the process of water evaporation from plant surfaces.

38 Medium

38 of 344

Application +4 | -1

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

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Correct option: D

Movement of water from cell-A to B

Option D (Movement of water from cell-A to B) is correct because water moves from a region of lower diffusion pressure deficit (DPD) to a region of higher DPD.

39 Easy

39 of 344

Remembering +4 | -1

Phloem sap is made up of

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Correct option: B

Water and sucrose

Option B (Water and sucrose) is correct because phloem sap primarily consists of water and sucrose, which is the main sugar transported in plants.

40 Medium

40 of 344

Remembering +4 | -1

The seeds cannot germinate without the presence of mycorrhizae in?

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Correct option: A

Pinus

Option A (Pinus) is correct because Pinus seeds often require the presence of mycorrhizae, a symbiotic association between fungi and plant roots, for successful germination and seedling establishment.

41 Medium

41 of 344

Remembering +4 | -1

Which of the following statement is correct?

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Correct option: A

DPD=OP-WP

Option A (DPD=OP-WP) is correct because Diffusion Pressure Deficit (DPD) is defined as the difference between Osmotic Pressure (OP) and Wall Pressure (WP) or Turgor Pressure (TP).

42 Medium

42 of 344

Remembering +4 | -1

The sugarcane plant has

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Correct option: A

Dumb bell-shaped guard cells

Option A (Dumb bell-shaped guard cells) is correct because sugarcane, being a monocot, has guard cells of this shape.

43 Easy

43 of 344

Understanding +4 | -1

Stomata open and close due to

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Correct option: D

All of these

Option D (All of these) is correct because turgor pressure, hormonal changes, and temperature all influence stomatal movement.

44 Medium

44 of 344

Analyzing +4 | -1

Assertion: Unidirectional flow of water, mineral
and nitrogen occurs through xylem.

Reason: Direction of flow of organic and
inorganic substances is unidirectional and
occurs through phloem.

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 water, minerals, and nitrogen flow unidirectionally through xylem, but the flow of organic and inorganic substances through phloem can be bidirectional.

45 Easy

45 of 344

Remembering +4 | -1

The water potential and osmotic potential of pure water is

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Correct option: A

Zero and zero

Option A (Zero and zero) is correct because pure water has no solutes and is at atmospheric pressure, making both its water potential and osmotic potential zero.

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46 Medium

46 of 344

Understanding +4 | -1

Find the false statement.

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Correct option: B

In a plasmolysed cell OP = TP

Option B (In a plasmolysed cell OP = TP) is false because in a plasmolysed cell, turgor pressure is zero, and osmotic pressure is not equal to it.

47 Medium

47 of 344

Remembering +4 | -1

A transport which uses energy to pump molecules against a concentration gradient is known as

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Correct option: C

Active transport

Option C (Active transport) is correct because it is the only transport mechanism that requires energy to move molecules against their concentration gradient.

48 Medium

48 of 344

Remembering +4 | -1

Hydathodes are also called

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Correct option: A

Water stomata

Option A (Water stomata) is correct because hydathodes are also known as water stomata, as they release water in liquid form.

49 Medium

49 of 344

Understanding +4 | -1

{H^ + }

pumps are helpful in?

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Correct option: B

Uniport

Option B (Uniport) is correct because H+ pumps facilitate the movement of a single type of molecule across the membrane in one direction, which is the definition of uniport.

50 Hard

50 of 344

Remembering +4 | -1

Osmosis is the diffusion of

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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.

51 Medium

51 of 344

Understanding +4 | -1

Mycorrhiza, a mutal relationship between fungus and a root of gymnosperm helps in
I. absorption of water
II. mineral absorption
III. translocation
IV. gaseous exchange Choose the correct option

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Correct option: B

II and I

Option B is correct. Mycorrhizae help in the absorption of water and minerals, so I and II are correct.

52 Easy

52 of 344

Understanding +4 | -1

During osmosis, water moves through a membrane

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Correct option: D

From : A hypotonic solution (less solute) , To : A hypertonic solution (more solute)

Option D (From : A hypotonic solution (less solute) , To : A hypertonic solution (more solute)) is correct because water moves from a hypotonic solution (lower solute concentration, higher water potential) to a hypertonic solution (higher solute concentration, lower water potential).

53 Medium

53 of 344

Understanding +4 | -1

When plant cell is kept in saline drip, cell

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Correct option: A

Decrease in size

Option A (Decrease in size) is correct because a saline drip is hypertonic, causing water to move out of the cell and shrink it.

54 Easy

54 of 344

Remembering +4 | -1

Transport of different types of solute substances takes place by

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Correct option: A

Bulk flow system

Option A is correct because the bulk flow system is responsible for the transport of different types of solute substances in plants.

55 Easy

55 of 344

Understanding +4 | -1

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

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Correct option: B

Active Transport

Option B is correct. Active transport is the movement and accumulation of ions across a membrane against their concentration gradient, requiring energy.

56 Medium

56 of 344

Understanding +4 | -1

Tension, one of the important factor in the movement of xylem sap in a tree is a result of

View answer and explanation

Correct option: C

Transpiration at the leaf surface

Option C (Transpiration at the leaf surface) is correct because transpiration creates a tension or pull that helps in the ascent of xylem sap.

57 Easy

57 of 344

Understanding +4 | -1

Passive absorption of mineral salts is not dependent on

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Correct option: B

Osmosis

Option B (Osmosis) is correct because passive absorption of mineral salts relies on diffusion, Donnan equilibrium, and ionic exchange, but not directly on osmosis, which is water movement.

58 Easy

58 of 344

Remembering +4 | -1

The shape of guard cells in stomata in sugarcane plant is

View answer and explanation

Correct option: A

Dumb bell-shaped

Option A (Dumb bell-shaped) is correct because guard cells in stomata of sugarcane (a monocot) are typically dumbbell-shaped, unlike the bean-shaped guard cells found in dicots.

59 Medium

59 of 344

Understanding +4 | -1

Choose true and false statements from the following
I. Mycorrhizal association between fungus and root of plant () is often obligate
II. and orchid seeds can germinate and grow into plant in absence of mycorrhizal association
III. Absorption of water along with mineral solute by root hairs is purely a process of diffusion
IV. In apoplast pathway, movement of water takes place through cell wall and intercellular spaces
V. Fungal hyphae provide sugar and organic internal to root Choose the correct option

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Correct option: C

I and IV are true

Option C (I and IV are true) is correct because mycorrhizal associations are often obligate, and apoplast pathway involves movement through cell walls and intercellular spaces.

60 Medium

60 of 344

Understanding +4 | -1

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

View answer and explanation

Correct option: B

Cohesion and adhesion

Option B (Cohesion and adhesion) is correct because cohesion and adhesion prevent the water column from breaking during ascent of sap.

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