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NEET • BIOLOGY • TRANSPORT IN PLANTS
Transport in plants practice · Medium
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31
Medium
31 of 205
Understanding
+4 | -1
When plant cell is kept in saline drip, cell
View answer and explanation
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.
32
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Understanding
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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.
33
Medium
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Understanding
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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
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
View answer and explanation
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.
34
Medium
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Understanding
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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.
35
Medium
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Remembering
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Who proposed the ‘Cohesion Theory’ of ascent of sap?
View answer and explanation
Correct option: D
Dixon andJolly
Option D (Dixon andJolly) is correct because Dixon and Jolly proposed the cohesion theory of ascent of sap.
36
Medium
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Understanding
+4 | -1
Which among the following is under the influence of both pressure and concentration?
View answer and explanation
Correct option: C
Absorption of water by root hairs
Option C (Absorption of water by root hairs) is correct because water absorption by root hairs is influenced by both the water potential gradient (concentration) and the pressure potential in the soil.
37
Medium
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Application
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The cell A has an osmotic potential of – 20 bars and a pressure potential of + 6 bars. What will be its water potential?
View answer and explanation
Correct option: A
- 14 bars
Option A (- 14 bars) is correct because water potential is calculated as the sum of osmotic potential and pressure potential.
38
Medium
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Application
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A leaf peeling of Tradescantia is kept in a medium having 10% NaCl. After a few minutes, if we observe the leaf peel under the microscope, we are likely to see
View answer and explanation
Correct option: D
Exit of water from the cell
Option D (Exit of water from the cell) is correct because the 10% NaCl solution is hypertonic, causing water to move out of the cell by osmosis.
39
Medium
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Understanding
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Consider the following statements and choose the correct option from codes given below
I. Loading of phloem is related to increase of sugar in phloem
II. Active loading of sugar in sieve tube of phloem is driven by proton pump
III. Pressure may be positive or negative in sieve tube cells
IV. Water and solutes move through the sieve tube against pressure gradient
V. Cytoplasmic strand passes through the holes in sieve plates and form continuous filaments
I. Loading of phloem is related to increase of sugar in phloem
II. Active loading of sugar in sieve tube of phloem is driven by proton pump
III. Pressure may be positive or negative in sieve tube cells
IV. Water and solutes move through the sieve tube against pressure gradient
V. Cytoplasmic strand passes through the holes in sieve plates and form continuous filaments
View answer and explanation
Correct option: B
III and IV are incorrect while I, II and V are correct
Option B (III and IV are incorrect while I, II and V are correct) is correct because loading of phloem increases sugar, active loading uses a proton pump, pressure in sieve tubes is positive, water and solutes move down the pressure gradient, and cytoplasmic strands pass through sieve plates.
40
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Understanding
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Why seeds imbibe and swell after keeping in water?
View answer and explanation
Correct option: C
Water potential gradient developes between the seed coat and water
Option C is correct because imbibition, driven by the water potential gradient, causes seeds to absorb water and swell.
41
Medium
41 of 205
Remembering
+4 | -1
Water potential and osmotic potential of pure water is
View answer and explanation
Correct option: A
Zero and zero
Option A (Zero and zero) is correct because pure water has a water potential and osmotic potential of zero under standard conditions.
42
Medium
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Remembering
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When a molecule moves across a membrane independent of other molecules, the process is called
View answer and explanation
Correct option: A
Uniport
Option A (Uniport) is correct because it describes the movement of a single molecule across a membrane independently.
43
Medium
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Analyzing
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Which among the following would be the best hypothesis to
explain the mechanism of stomatal action in night in
succulent plants when the stomata remains open?
explain the mechanism of stomatal action in night in
succulent plants when the stomata remains open?
View answer and explanation
Correct option: B
Increase in concentration, conversion of organic
acids into starch resulting in the increased conversions
into sugars resulting in transport
acids into starch resulting in the increased conversions
into sugars resulting in transport
Option B (Increase in concentration, conversion of organic acids into starch resulting in the increased conversions into sugars resulting in transport) is correct because it describes the mechanism of stomatal opening in succulent plants at night.
44
Medium
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Understanding
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At the time of seed germination, when water is absorbed by the seed due to imbibition, the seed coat breaks as it swells to a lesser degree than the kernel because
View answer and explanation
Correct option: B
The kernel is made up of proteins, lipids and starch, while the seed coat is formed of cellulose
Option B (The kernel is made up of proteins, lipids and starch, while the seed coat is formed of cellulose) is correct because the kernel's composition allows for greater imbibition and swelling compared to the seed coat, which is primarily cellulose.
45
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Understanding
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Root hair absorb water from the soil on account of
View answer and explanation
Correct option: C
Suction pressure
Option C (Suction pressure) is correct because root hairs absorb water due to the suction pressure created by the difference in water potential between the soil and the root cells.
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46
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Understanding
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A plant cell becomes turgid due to
View answer and explanation
Correct option: C
Endosmosis
Option C (Endosmosis) is correct because endosmosis, the movement of water into the cell, causes the cell to swell and become turgid.
47
Medium
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Understanding
+4 | -1
Which of the following maintains the shape of cell?
View answer and explanation
Correct option: B
Turgor pressure
Option B (Turgor pressure) is correct because turgor pressure, the pressure exerted by the cell contents against the cell wall, maintains the shape of the cell.
48
Medium
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Remembering
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Which of the following is used as an antitranspirant?
View answer and explanation
Correct option: D
Phenyl mercuric acetate
Option D (Phenyl mercuric acetate) is correct because phenyl mercuric acetate (PMA) is a chemical that reduces transpiration by inducing partial stomatal closure.
49
Medium
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Understanding
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Water in the vessel of xylem in tall plant is
View answer and explanation
Correct option: B
Pulled
Option B (Pulled) is correct because water in the xylem is primarily pulled up by transpiration from the leaves, according to the cohesion-tension theory.
50
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Understanding
+4 | -1
Transport of gases, hormones, photosynthetase and organic solutes in plants is
View answer and explanation
Correct option: A
Multidirectional
Option A (Multidirectional) is correct because the transport of gases, hormones, photosynthates, and organic solutes in plants can occur in multiple directions.
51
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Analyzing
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Assertion: Transpiration facilitate supply of
water for photosynthesis, maintains shape and
structure of plant and transport minerals from
the soil to other parts of the plant.
Reason: Process of transpiration helps in
translocation of inorganic and sugar molecules
from the source to sink.
water for photosynthesis, maintains shape and
structure of plant and transport minerals from
the soil to other parts of the plant.
Reason: Process of transpiration helps in
translocation of inorganic and sugar molecules
from the source to sink.
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 the assertion about transpiration's benefits is true, but the reason incorrectly describes translocation.
52
Medium
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Remembering
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The non - living continum that occurs in plants is called?
View answer and explanation
Correct option: A
Apoplast
Option A (Apoplast) is correct because the apoplast is the non-living continuum in plants, consisting of cell walls and intercellular spaces.
53
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Understanding
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Whose water potential is less than water potential of root hair during the water absorption by root hair?
View answer and explanation
Correct option: D
Vacuolar sap
Option D (Vacuolar sap) is correct because the vacuolar sap has the lowest water potential compared to the soil solution, gravitational water, and pure water, facilitating water absorption by the root hair.
54
Medium
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Remembering
+4 | -1
Who is called father of plant physiology
View answer and explanation
Correct option: C
Stephen hales
Option C (Stephen hales) is correct because Stephen Hales is widely regarded as the father of plant physiology due to his pioneering experiments.
55
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Understanding
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Osmosis is?
View answer and explanation
Correct option: C
Special type of facilitated diffusion
Option C (Special type of facilitated diffusion) is correct because osmosis involves the movement of water across a semi-permeable membrane, facilitated by aquaporins, down a concentration gradient.
56
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Analyzing
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Assertion (A): Buds obtain energy for their growth and development of photosynthetic apparatus from sugars stored in roots.
Reason (R): Source and sink relationship in phloem transport is reversible based on plant's needs.
Reason (R): Source and sink relationship in phloem transport is reversible based on plant's needs.
View answer and explanation
Correct option: A
Both (A) and (R) are true and (R) is the correct explanation of (A)
Option A (Both (A) and (R) are true and (R) is the correct explanation of (A)) is correct because buds rely on stored sugars, and the source-sink relationship is indeed reversible based on the plant's needs.
57
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Understanding
+4 | -1
The parts of plants with least amount of water is
View answer and explanation
Correct option: D
1 and 2
Option D (1 and 2) is correct because dry seeds and woody parts of plants have the least amount of water compared to other plant tissues.
58
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Understanding
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Osmosis is the movement of water against the concentration of A and along the concentration of B. A and B are
View answer and explanation
Correct option: D
Solute, solvent
Option D (Solute, solvent) is correct because osmosis is the movement of water (solvent) from a region of lower solute concentration to a region of higher solute concentration, effectively moving against the solute concentration gradient and along the solvent concentration gradient.
59
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Understanding
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Active transport does not involve
View answer and explanation
Correct option: C
Movement down the concentration gradient
Option C (Movement down the concentration gradient) is correct because active transport moves substances against the concentration gradient, not down it.
60
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Understanding
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Select the correct statement
View answer and explanation
Correct option: D
All of the above
Option D (All of the above) is correct because all the statements about water absorption and transport are correct.
Revision notes and key takeaways
Review TRANSPORT IN PLANTS in your textbook or class notes, then use this set to check your understanding.
Showing 31-60 of 205 questions