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NEET • BIOLOGY • TRANSPORT IN PLANTS
Transport in plants practice · Medium
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61
Medium
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Understanding
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What will be the effect of accumulation of ions in guard cells?
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Correct option: B
Water potential decreases
Option B (Water potential decreases) is correct because the accumulation of ions in guard cells decreases the water potential.
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Remembering
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Which part of root absorbs both water and minerals?
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Correct option: A
Zone of cell differentiation
Option A is correct because the zone of cell differentiation, also known as the root hair zone, is where root hairs develop and absorb water and minerals.
63
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Remembering
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Scotoactive stomata are seen in?
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Correct option: A
Succulent plants
Option A (Succulent plants) is correct because scotoactive stomata, which open at night and close during the day, are characteristic of succulent plants (CAM plants) adapted to arid environments.
64
Medium
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Remembering
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Transport of food materials in higher plants occurs through
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Correct option: D
Sieve elements
Option D (Sieve elements) is correct because sieve elements are the primary cells responsible for the translocation of food materials in higher plants.
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Remembering
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Loading of sucrose in sieve tube elements is
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Correct option: B
Active process
Option B is correct because the loading of sucrose into sieve tube elements is an active process, requiring energy to move sucrose against its concentration gradient.
66
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Remembering
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The magnitude of root pressure ranges between
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Correct option: B
1-5 atm
Option B (1-5 atm) is correct because the magnitude of root pressure typically ranges between 1 to 5 atmospheres.
67
Medium
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Remembering
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Which of the following is the unit of measurement of water potential?
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Correct option: C
Pascal
Option C (Pascal) is correct because water potential is measured in units of pressure, and the SI unit of pressure is the Pascal.
68
Medium
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Remembering
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Xylem translocates.
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Correct option: D
Water, mineral salts, some organic nitrogen and hormones
Option D (Water, mineral salts, some organic nitrogen and hormones) is correct because xylem transports a comprehensive mix of substances, including water, minerals, organic nitrogen, and hormones.
69
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Understanding
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Which one of the following is correctly matched?
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Correct option: D
Active transport – Highly selective
Option D is correct. Active transport is highly selective because it involves specific carrier proteins that bind to specific ions or molecules.
70
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Application
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A cell dipped in 0.5 M sucrose solution has no effect but when the same will be dipped in 0.5 M NaCl solution, the cell will
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Correct option: B
Decrease in size
Option B (Decrease in size) is correct because NaCl dissociates into ions, increasing the solute concentration outside the cell, causing water to move out and the cell to shrink.
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Analyzing
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Assertion (A): Substances soluble in lipids diffuse through the membrane slower.
Reason (R):The diffusion rate depends on the size of substances, smaller molecules diffuse faster.
Reason (R):The diffusion rate depends on the size of substances, smaller molecules diffuse faster.
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Correct option: C
(A) is true but (R) is false
Option C ((A) is true but (R) is false) is correct because substances soluble in lipids diffuse faster, and the diffusion rate depends on both size and lipid solubility, not just size.
72
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Understanding
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Adhesion is caused by
View answer and explanation
Correct option: D
Attraction of water molecule to polar surface
Option D (Attraction of water molecule to polar surface) is correct because adhesion is the attraction between water molecules and polar surfaces like xylem walls.
73
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Understanding
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Which one is not the job of zone of cell differentiation in roots?
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Correct option: C
Carbon dioxide uptake
Option C (Carbon dioxide uptake) is correct because the zone of cell differentiation is primarily involved in water and mineral uptake, not carbon dioxide uptake.
74
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Remembering
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Fensom and Jones suggested which of the following method for translocation of solute?
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Correct option: D
Electrosmosis
Option D (Electrosmosis) is correct because Fensom and Jones proposed electrosmosis as a method for solute translocation in plants.
75
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Remembering
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Direction of translocation of organic food or solutes, is
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because organic food or solutes can be translocated upwards, downwards, and radially within a plant through the phloem.
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Understanding
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Which one of the following doesn’t help in molecule transport?
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Correct option: C
Surface tension
Option C is correct. Surface tension is a property of liquids but does not directly facilitate molecule transport across membranes or within plants.
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Understanding
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Root endodermis has the ability to actively transport ions …A… because of …B… . Choose the correct pair
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Correct option: B
A-undirectionally; B-casparion strips
Option B (A-undirectionally; B-casparion strips) is correct because the endodermis transports ions unidirectionally due to the Casparian strips.
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Remembering
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Stomatal opening is regulated by
View answer and explanation
Correct option: A
Light
Option A (Light) is correct because light is a primary factor that stimulates stomatal opening.
79
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Remembering
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Stomata that can also open at night, present in:
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Correct option: A
xerophytes
Option A (xerophytes) is correct because some xerophytes have stomata that can open at night (CAM photosynthesis).
80
Medium
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Application
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Examples of bulk flow by a positive hydrostatic pressure gradient and a negative hydrostatic pressure gradient are
View answer and explanation
Correct option: C
Garden hose and suction through a straw, respectively
Option C (Garden hose and suction through a straw, respectively) is correct because a garden hose exemplifies positive hydrostatic pressure, while suction through a straw demonstrates negative hydrostatic pressure.
81
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Understanding
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Which of the following mechanism can explain the transport of sucrose from source to sink?
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Correct option: A
Osmotic movement of water into sugar loaded sieve tube cells which create a higher hydrostatic pressure into the source than in the sink
Option A (Osmotic movement of water into sugar loaded sieve tube cells which create a higher hydrostatic pressure into the source than in the sink) is correct because the pressure flow hypothesis explains sucrose transport from source to sink by osmotic water movement creating a pressure gradient.
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Understanding
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Which pathway applies least resistance to the movement of water?
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Correct option: A
Apoplast pathway
Option A (Apoplast pathway) is correct because the apoplast pathway involves movement through cell walls and intercellular spaces, offering less resistance compared to symplast or transmembrane pathways.
83
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Remembering
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The water available to plants for absorption is
View answer and explanation
Correct option: C
Capillary water
Option C (Capillary water) is correct because capillary water is held in the soil pores by capillary forces and is readily available for plant uptake.
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Understanding
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Nyctinasty and seismonasty in plants like bean and touch me not are produced due to
View answer and explanation
Correct option: B
Reversible turgor pressure in the cell of their pulvini
Option B (Reversible turgor pressure in the cell of their pulvini) is correct because nyctinasty and seismonasty are caused by changes in turgor pressure in the pulvinus cells.
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Understanding
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Which of the following statements are true/false?
I. The positive hydrostatic pressure is called turgor pressure.
II. Wall pressure exerts to prevent the increase of protoplasm size.
III. Diffusion is more rapid in liquids than in gases.
IV. Diffusion of water through a semi-permeable membrane is called imbibition.
V. Osmosis is movement of substance, which takes place along a diffusion gradient
I. The positive hydrostatic pressure is called turgor pressure.
II. Wall pressure exerts to prevent the increase of protoplasm size.
III. Diffusion is more rapid in liquids than in gases.
IV. Diffusion of water through a semi-permeable membrane is called imbibition.
V. Osmosis is movement of substance, which takes place along a diffusion gradient
View answer and explanation
Correct option: A
I and II are true, while III, IV and V are false
Option A (I and II are true, while III, IV and V are false) is correct because turgor pressure is positive hydrostatic pressure, wall pressure prevents protoplasm increase, diffusion is faster in gases, water movement is osmosis, and osmosis follows water potential gradient.
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Understanding
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When sugars enter sieve tubes, water flows by osmosis, resulting in
View answer and explanation
Correct option: C
Turgor pressure
Option C (Turgor pressure) is correct because when sugars enter sieve tubes, the water potential decreases, causing water to flow in by osmosis, which increases the turgor pressure.
87
Medium
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Remembering
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Which one is true about guttation?
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Correct option: A
It occurs through specialized pores called hydathodes
Option A (It occurs through specialized pores called hydathodes) is correct because guttation specifically happens through hydathodes.
88
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Understanding
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Active transport differs from facilitated transport as the former
View answer and explanation
Correct option: D
Is ATP dependent
Option D (Is ATP dependent) is correct because active transport requires energy in the form of ATP to move molecules against their concentration gradient, while facilitated transport does not.
89
Medium
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Understanding
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When a plasmolyzed cell is placed in a hypotonic solution then water will move inside the cell. Which force causes this?
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Correct option: A
DPD
Option A (DPD) is correct because Diffusion Pressure Deficit (DPD) determines the direction of water movement into the cell when it is placed in a hypotonic solution.
90
Medium
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Understanding
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Identify the correct statements from the following:
I.Accumulation of ions in the guard cells does not require energy.
II.A high pH favours stomatal opening.
III. Movement of chloride ions into the guard cells accrues in the response to the electrical differential created by ions.
IV. With the entry of several ions and chloride ions, the water potential of guard cells increases
I.Accumulation of ions in the guard cells does not require energy.
II.A high pH favours stomatal opening.
III. Movement of chloride ions into the guard cells accrues in the response to the electrical differential created by ions.
IV. With the entry of several ions and chloride ions, the water potential of guard cells increases
View answer and explanation
Correct option: C
II and III
Option C (II and III) is correct because a high pH favors stomatal opening, and chloride ion movement into guard cells is driven by electrical gradients.
Revision notes and key takeaways
Review TRANSPORT IN PLANTS in your textbook or class notes, then use this set to check your understanding.
Showing 61-90 of 205 questions