11.TRANSPORT IN PLANTS QUESTIONS
Melvin Calvin earned Nobel prize in 1961 for
(A) mapping pathway of carbon assimilation in respiration
(B) mapping pathway of carbon absorption in photosynthesis
(C) mapping pathway of carbon assimilation in photosynthesis
(D) mapping pathway of carbon absorption in respiration.
Cytoplasmic streaming helps to move substances over
(A) long distances
(B) small distances
(C) Both (a) and (b)
(D) None
Translocation is transport over
(A) long distance
(B) short distance
(C) Both long and short distance
(D) None of these
Transport of minerals in plants is
(A) unidirectional only
(B) multidirectional
(C) Both unidirectional & multidirectional
(D) Dependent on the hormones released
Nutrients are re-exported from
(A) nascent leaves to senescent leaves
(B) senescent leaves to nascent leaves
(C) all parts to senescent leaves
(D) not re-exported
Movement by diffusion is
(A) active with energy expenditure
(B) passive with energy expenditure
(C) both active and passive
(D) without energy expenditure
In diffusion, molecules
(A) move in a fixed fashion, from high to low concentration
(B) move in random fashion, from high to low concentration
(C) move in fixed fashion, from low to high concentration
(D) move in random fashion, from low to high concentration.
Diffusion
(A) in solid is more likely rather than of solid
(B) of solid is more likely than in solid
(C) Both (a) and (b)
(D) Does not occur in solids at all.
Diffusion rates are affected by
(A) Concentration gradient
(B) pressure
(C) temperature
(D) All of these
Statement (A) Diffusion can’t occur in dead cell.
Statement (B) Diffusion is the only means for gaseous movement in plant body.
Choose the best option
(A) Statement A is correct and Statement B is wrong
(B) Statement A is wrong and Statement B is correct
(C) Both are correct
(D) Both are wrong
Diffusion rate
(A) depend on size and larger substance diffuse faster
(B) depend on size and smaller substance diffuse faster
(C) doesn’t depend on size
(D) depend on size and do not substance diffuse larger.
Hydrophilic moiety substances
(A) diffuse through a membrane easily
(B) do not diffuse through a membrane easily
(C) need no membrane facilitation to diffuse through
(D) Both (a) and (c)
Read the following statements
(i) Membrane proteins aid in transport of hydrophobic substance.
(ii) Membrane proteins do not set up a concentration gradient.
(iii) Diffusion through membrane proteins is called facilitated diffusion.
(iv) Membrane proteins always need ATP to transport substances across membrane.
How many of the above statements are wrong?
(A) 1
(B) 2
(C) 3
(D) 4
In facilitated diffusion
(A) special proteins & ATP are involved
(B) only special proteins are involved
(C) only ATP are involved
(D) neither special proteins nor ATP are involved.
Facilitated diffusion cannot
A) transport molecules from high concentration to low concentration
B) transport molecules from low concentration to high concentration
C) Both (a) and (b)
D) Concentration does not matter
Facilitated diffusion transport is
(i) Saturable (ii) unsaturable
(iii) inhibitable (iv) non-inhibitable
(v) selective (vi) non-selective
(vii) uphill (viii) downhill
Which is the correct combination
(A) i, iii, v, vii (B) ii, iv, vi, viii (C) i, iii, v, viii (D) i, iv, vi, viii
Porins are found in
(A) outer membrane of plastids & mitochondria
(B) Inner membrane of plastids & mitochondria
(C) both outer & inner membrane of mitochondria
(D) membrane of lysosoems
Water channels are made up of ____ different types of aquaporins
(A) 6
(B) 8
(C) 10
(D) 12
Identify the correct label for the figure given
(A) It shows facilitated diffusion
(B) shows simple diffusion
(C) shows sample of water channels
(D) Both (a) and (c)
(i) Symport will not work if single type of molecule is there.
(ii) Uniport allows two molecules to move in a unidirection together.
(iii) Antiport allows two types of molecules to move in opposite direction.
How many of the above statements is correct
(A) 0
(B) 1
(C) 2
(D) 3
Identify correct statements about the figure given
(A) (i) – It shows simple diffusion via uniport
(B) (ii) – It shows simple diffusion via antiport
(C) Both (a) & (b) are correct
(D) None of these
Active transport is
(A) Uphill
(B) downhill
(C) unsaturable
(D) both (a) and (b)
Pumps are
(A) energy using transport proteins
(B) non-energy using transport protein
(C) energy using transport lipids
(D) non-energy using transport lipids
Active transport rate reaches maximum when
(A) All molecules are loaded on carrier proteins
(B) 80% of the molecules are loaded on carrier proteins
(C) 50% of the molecules are loaded on carrier proteins
(D) Can be any of these
Match the columns A & B
A |
B |
| (i) Simple diffusion | (I) Uphill |
| (ii) Facilitated diffusion | (II) Saturable |
| (iii) Active transport | (III) Selective |
| (IV) Passive | |
| (V) Carrier protein |
(A) (i)–III, (ii)–IV, (iii)–I
(B) (i)–IV, (ii)–II, (iii)–III
(C) (i)–V, (ii)–IV, (iii)–II
(D) (i)–IV, (ii)–I, (iii)–II
Most herbaceous plants have about
(A) 10-15% of its dry weight as fresh matter.
(B) 85-90% of its fresh weight as dry matter.
(C) 10-15% of its fresh weight as dry matter.
(D) 85-90% of its fresh weight as water.
Why is water often limiting factor for plant growth & productivity?
(A) Due to high respiration (B) Due to high photosynthesis
(C) Due to low availability of water (D) Due to transpiration of water
Kinetic energy possessed by water molecules is represented directly by its
(A) pressure potential (B) water potential
(C) soluble potential (D) osmotic potential
Pure water has
(A) Lowest water potential at all pressures
(B) Zero water potential at all pressures.
(C) Water potential at all pressures highest
(D) Both (b) and (c)
Water moves from system containing water at (i) to one with (ii)
Which of the given equations is correct?
is
(A) always positive (B) always negative
(C) sometimes negative (D) mostly zero
is
(A) always positive
(B) always negative
(C) usually positive, sometimes negative
(D) usually negative, sometimes positive
The more the solute
(A) the lower (less negative) the
(B) the higher (less negative) the
(C) the lower (more negative) the
(D) the higher (more negative) the
If pure water (pH = 7) is kept in open vessel at room temperature, its water potential
(A) zero
(B) positive
(C) negative
(D) can’t say
Water potential represents kinetic energy of water molecules. When = 0.
(A) kinetic energy of molecules of water is zero.
(B) kinetic energy of molecules of water is not zero.
(C) kinetic energy of molecules of water is negative
(D) kinetic energy of molecules of water is positive
Cell wall is
(A) impermeable to water and substances in solution
(B) permeable to water and substances in solution
(C) permeable to water but not to substance in solution.
(D) impermeable to water but not to substances in solution.
Read the following statements
(i) vacuolar sap contribute to solute potential of cell
(ii) cell membrane & tonoplast together are importance determinants of movement
of molecules in or out of cells.
(iii) Osmosis occurs spontaneously in response to a driving force
How many of the above statements are Incorrect
(A) 1
(B) 2
(C) 3
(D) None of these
Osmosis refers to
(A) diffusion of solute across permeable membrane
(B) diffusion of solute across differentiallypermeable membrane
(C) diffusion of water across differentially permeable membrane
(D) diffusion of water across permeable membrane
Water moves under osmosis from
(A) higher chemical potential to lower chemical potential
(B) lower chemical potential to higher chemical potential.
(C) lower potential concentration to higher concentrations.
(D) more than one option is correct.
In potato osmometer, if potato tuber is placed in water
(A) water exits the cavity of potato tuber via simple diffusion.
(B) water enters the cavity of potato tuber via simple diffusion.
(C) water exits the cavity of potato tuber via osmosis
(D) water enters the cavity of potato tuber via osmosis
Which chamber has a lower water potential?
(A) A
(B) B
(C) Both are equal
(D) Can’t say
Solution of which chamber has more negative solute potential?
(A) A
(B) B
(C) Both are equal
(D) can’t say
In which direction will osmosis occur?
(A) from A to B
(B) from B to A
(C) No net movement
(D) can’t say (insufficient data)
Which solution has a higher solute potential?
(A) B
(B) A
(C) Both are equal
(D) can’t say
At equilibrium which chamber will have lower water potential?
(A) B
(B) A
(C) Both are equal
(D) Insufficient data
If one chamber has a of –2000 kPa and the other –1200 kPa, which is chamber with higher ?
(A) B
(B) A
(C) C
(D) Can’t say
If one of the solutions has and other has what will be direction of water movement?
(A) A to B
(B) B to A
(C) No net movement
(D)Random movement
To prevent water from diffusing in pressure is applied. Which of the following statements is correct?
(A) The more the solute, the greater will be pressure required.
(B) The more the solute, the lesser will be pressure required
(C) The pressure is equal to osmotic potential exactly.
(D) Both (a) & (c)
Osmotic pressure is (ii) & osmotic potential is (ii)
(A) (i) – positive, (ii) negative
(B) (i) –negative, (ii) – positive
(C) (i), – positive, (ii) – positive
(D) (i) – negative, (ii) – negative
Match the columns
A |
B |
| (i) Isotonic | I. external solution is more dilute |
| (ii) Hypotonic | II. external solution is more concentrated |
| (iii) Hypertonic | III. external solution balances the osmotic pressure of cytoplasm |
(A) (i)-I, (ii)-III, (iii)-II
(B) (i)-III, (ii)-I, (iii)-II
(C) (i)-III, (ii)-II, (iii)-I
(D) (i)-II, (ii)-I, (iii)-III
Cells
(A) swell in hypotonic, shrink in isotonic
(B) swell in isotonic, shrink in hypertonic
(C) swell in hypertonic, shrink in hypotonic
(D) swell in hypotonic, shrink in hypertonic
Plasmolysis occurs
(A) in hypotonic solution
(B) when water moves into the cell
(C) when solution has more solute than protoplasm
(D) when cell membrane becomes turgid
When water moves out of a cell placed in hypertonic solution.
(A) water is first lost from vacuole, then cytoplasm
(B) water is first lost from cytoplasm, then vacuole
(C) water is first lost from tonoplast, then cytoplasm
(D) water is first lost from cytoplasm, then tonoplast
Identify A, B & C in given figure.
(A) A – plasmolysed, B – isotonic, C – Turgid
(B) B – flaccid, C – hypertonic, A – Turgid
(C) A – hypotonic, C – hypotonic, B – Turgid
(D) A – turgid, B – flaccid, – hyper tonic
The process of plasmolysis is
(A) always irreversible
(B) always reversible
(C) usually reversible
(D) always temporary
Plant cells do not rupture in hypotonic solution due to
(A) turgor pressure
(B) pressure potential
(C) cell membrane
(D) cell wall
What will be of flaccid cell
(A) positive
(B) negative
(C) zero
(D) any of the above
Imbibition
(A) Causes reduction in volume
(B) is a type of active transport
(C) is along the concentration gradient
(D) occurs in gases
Bulk movement of substances through vascular tissues of plants is called
(A) Active transport
(B) Facilitated diffusion
(C) Transportation
(D) Translocation
Substances in mass flow
(A) are swept at some pace in solution
(B) are swept at speed depending upon size.
(C) are swept at some pace in suspensions
(D) Both (A) and (C)
Bulk flow is achieved by
(A) positive water pressure gradient
(B) negative water pressure gradient
(C) Both (A) and (B)
(D) It rarely depends on pressure gradient
Xylem is associated with translocation of mainly
(i) Water (ii) organic solutes and sucrose
(iii) mineral salts (iv) organic nitrogen
(v) inorganic solute (vi) hormones
Choose correct combination
(A) i, v, iii (B) ii, vi, iv (C) iii, vi, iv (D) i, ii, iii
Absorption of water along with mineral solutes by root hairs is
(A) purely by facilitated diffusion
(B) purely by diffusion
(C) purely by active transport
(D) by a combination of diffusion and active transport
Apoplast is continuous throughout the plant, except at
(A) endodermis
(B) casparian strips
(C) plasmodesmata
(D) tracheids
Apoplastic movement involves
(A) crossing the cell membrane
(B) crossing the tonoplast
(C) crossing the cell wall
(D) Both (a) and (c)
Symplastic system of cells is connected through
(A) nucleoplasmic strands extending through phragmosomes
(B) nucleoplasmic strands extending through plasmodesmata
(C) cytoplasmic strands extending through phragmosomes
(D) cytoplasmic strands extending through plasmodesmata
Cytoplasmic streaming
(A) helps in long distance transport
(B) can be seen in Hydrilla leaf
(C) may be part of symplastic movement
(D) Both (B) & (C)
Most of the water flow in roots occurs via
(A) symplast through living cells
(B) symplast through cortical cells
(C) apoplast through intercellular spaces
(D) apoplast through endodermal cells
Water movement through root tissues
(A) can be initially symplastic and finally apoplastic
(B) has to be ultimately apoplastic
(C) can be completely apoplastic
(D) None of the above is correct.
Read the given statements
(i) Mycorrhiza is symbiotic bacterial association of root system.
(ii) Mycorrhiza helps in water absorption.
(iii) Mycorrhiza may penetrate root cells
(iv) Mycorrhiza may from a network around young root.
Which of these statements is correct?
(A) 1
(B) 2
(C) 3
(D) 4
Which of the following statements about mycorrhiza is correct?
(A) Fungus provides N-containing compounds to plant roots.
(B) Roots provide minerals & water to mycorrhizae.
(C) Pinus seeds cannot germinate without mycorrhiza
(D) Both (A) & (C)
Identify the correct labels in given figures
(A) (i)-Cortex, (ii)-Plasmodesmata, (iii)-Endodermis, (iv)-pericycle
(B) (i)-Casparian strips, (ii)- Plasmodesmata, (iii)-Pericycle, (iv)-Cortex
(C) (i)-Cytoplasmic extension, (ii)-Cortex, (iii)-Endodermis, (iv)-Pericycle
(D) (i)-Endodermis (ii)-Cytoplasmic extension, (iii)-Cortex, (iv)-Pericycle
Root pressure is caused by
(A) active transport of ions into roots
(B) passive transport of water into roots
(C) active transport of water into roots
(D) both (A) & (B)
Root pressure is
(A) always positive
(B) always negative
(C) mostly positive
(D) mostly negative
Guttation occurs
(A) due to negative root pressure and low evaporation
(B) due to positive root pressure and low evaporation
(C) due to negative root pressure and high evaporation
(D) due to positive root pressure and high evaporation
Root pressure contributes in
(A) majority of plant water transport
(B) transpirational pull
(C) re-establishing the continuous chain of water in xylem
(D) Both (a) & (c)
Identify the correct labeles for given figure.
(i) (ii) (iii) (iv)
(A) Apoplastic symplastic xylem phloem Pathway pathway
(B) symplastic apoplastic xylem phloem Pathway pathway
(C) Apoplastic symplatic phloem xylem Pathway pathway
(D) symplastic Apoplastic Phloem xylem Pathway pathway
Which of the statements is correct?
(A) About 30% water reaching leaves is transpired
(B) About 80% water reaching leaves is transpired
(C) About 90% water reaching leaves is transpired
(D) About 99% water reaching leaves is transpired
The immediate cause of opening and closing of stomata is
(A) change in CO2 concentration
(B) change in turgidity of guard cell
(C) change in concentration in complementary cell
(D) change in water (moisture) content of air.
Stomatal aperture is
(A) cell between guard cells
(B) Pore between guard cell
(C) Inner wall of guard cell
(D) Inner wall of subsidiary cell
Inner wall of each guard cell is
(A) thin and inelastic
(B) thin and elastic
(C) thick and inelastic
(D) thick and elastic
Microfibrils of cell wall of guard cell are
(A) proteinaceous and radial
(B) proteinaceous and longitudinal
(C) cellulosic and radial
(D) cellulosic and longitudinal
Which of these statements about stomata opening or closing is correct?
(A) When guard cells are turgid, stoma closes
(B) When guard cells are flaccid, stoma opens
(C) When guard cells lose turgor, elastic outer walls regain their original shape and stoma closes
(D) None of these
How many of the following are plant factors affecting transpiration? Water status of plant, number of stomata, wind speed, light, canopy structure, humidity, temperature
(A) 7
(B) 3
(C) 4
(D) 5
Choose the correct labels for the given figure
(i) (ii) (iii)
(A) Guard cell Microfibril Stomatal aperture
(B) Microfibril Guard cell Stomatal aperture
(C) Stomatal aperture Microfibril Guard cell
(D) Guard cell Stomatal Microfibril aperture
Which of the following statements is incorrect?
(A) Cohesion is the property of xylem sap.
(B) Adhesion is the attraction of water molecules to surface of tracheary elements
(C) Adhesion is a property of xylem wall.
(D) Capillarity is the ability of water to ascend in thin tubes.
Water is moved from xylem to leaf cells by
(A) a push force of continuously upcoming xylem sap
(B) a push force of water incoming from phloem
(C) a pull force of cohesion between water molecules
(D) a pull force of water diffusing into air.
Why does water diffuse into the surrounding?
(A) Due to lower concentration of water vapour in atmosphere.
(B) Due to lower concentration of water vapour in the sub-stomatal cavity.
(C) due to lower concentration of water vapour in the intercellular spaces.
(D) Due to lower concentration of water vapour in the xylem element.
Choose correct option
(A) The figure shows water movement in a monocot leaf.
(B) The water moves due to a negative pressure created by xylem.
(C) The water moves due to a push force created by the water diffusing into surrounding
(D) The figure shows water movement in a dicot leaf.
Transpiration
(A) supplies water for photosynthesis
(B) decreases water available for photosynthesis
(C) has no relation with photosynthesis
(D) Both (a) & (b)
Read the given statements
(i) Transpiration enables mineral transport
(ii) Transpiration maintains shape of plants.
(iii) Transpiration enables light absorption by plants.
(iv) Transpiration causes cooling effect.
Choose the appropriate answer
(A) Statement (i) & (ii) are correct, (iii) & (iv) are wrong
(B) Statement (iii) & (iv) are correct, (i) & (ii) are wrong
(C) Statement (i), (ii), (iii) are correct (iv) is wrong
(D) Statement (i), (ii), (iv), are correct (iii) is wrong
Transpiration cools leaf surface by upto
(A) 2–3℃
(B) 5–6℃
(C) 10–15℃
(D) 18–20℃
A limiting factor for photosynthesis is
(A) Water due to evaporation by high light intensity
(B) Water due to transpiration
(C) Sunlight due to cooling effect of transpiration
(D) CO2 due to excess transpiration
Humidity of rainforests is largely due to
(A) Cycling of nutrients from leaf to root
(B) Cycling of water from leaf to root
(C) Cycling of nutrients from root to leaf
(D) Cycling of water from root to leaf
Read the given statements
(I) C4 plants loses double the water lost by C3 plant for same amount of CO2 fixed
(II) C4 plants are more efficient in making sugar than C3 plants.
Choose the best option
(A) I and II are correct (B) I is correct and II is incorrect
(C) I is incorrect and II is correct (D) Both I & II are incorrect
All minerals cannot be passively absorbed by roots because
(A) They are present as ions which cannot more a cross cell membrane.
(B) Concentration of minerals in soil is higher than the concentration of minerals in roots
(C) Both (a) & (b)
(D) all minerals are passively absorbed
Which of the given statements is correct about uptake of mineral ions?
(A) Active uptake of ions is helps in uptake of water actively
(B) Passive uptake of ions helps in uptake of water actively
(C) Active uptake of ions help in uptake of water passively.
(D) Passive uptake of ions help in uptake of water passively.
Ions are absorbed from soil by
(A) active transport only (B) passive transport only
(C) mostly passive transport (D) both active & passive transport
The transport proteins embedded in the plasma membrane of endodermal cells
(A) allow all types of solute to pass to xylem.
(B) allow some solutes to cross the membrane
(C) shows no selectively
(D) Both (a) & (c)
Quantity & types of solute reaching xylem are decided at
(A) control points of epidermal cells as the transport starts there
(B) control point of pericycle cells as they surround the xylem
(C) control point of cortical cells as they have large intercellular spaces.
(D) control point of endodermal cells as they have specific transport proteins and suberin.
Layer of suberin present in root
(A) in cortical possess ability to passively transport ions in one direction only.
(B) can actively transport selected ions in both the directions.
(C) can transport ions actively in one direction only.
(D) can transport ions in multi directions actively
After the ions reach xylem, their further transport to all parts of plant is through
(A) diffusion
(B) active transport
(C) translocation
(D) All of the above
Chief sinks for mineral elements are the following except
(A) root hairs
(B) fruits
(C) seeds
(D) shoot tip
Unloading of mineral ions occurs at the fine vein ending through (i) and uptake by cells is (ii)
(i) (ii)
(A) active transport diffusion
(B) diffusion actively
(C) active transport passive
(D) diffusion passive
Mineral ions are
(A) rarely remobilized, from mature parts to young parts.
(B) rarely remobilized from young leaves to old parts
(C) frequently remobilized from older parts to young parts
(D) frequently remobilized from young parts to older parts
Elements most readily mobilized
(A) phosphorous
(B) potassium
(C) calcium
(D) both (A) & (B)
Most of the nitrogen travels through xylem as
(A) inorganic ions
(B) inorganic complex
(C) organic compounds
(D) both (a) & (b)
Which of the following is correct
(A) most of the P and S are carried as organic compounds
(B) most of P and S are carried as inorganic compounds.
(C) Little of P and S are carried as organic compounds.
(D) Both (B) & (C)
Read the given statements
(I) Some exchange of materials occur between xylem and phloem
(II) We cannot say that xylem transports only inorganic nutrients.
Choose the correct option.
(A) I and II both are correct and II is correct explanation for I
(B) I and II both are correct but II does not explain I
(C) I is correct and II is incorrect
(D) I and II both are incorrect
Which of the following statements about source and sink is incorrect
(A) Source is the part which produces food, like leaf
(B) Sink is the part which needs food
(C) Leaf can never be a sink
(D) Roots may act as a source
Choose the correct option
(A) Movement in phloem is bidirectionalleft & right, while movement in xylem
is unidirectional upward
(B) Movement in phloem is unidirectional upward while movement in xylem is
bidirectional left & right
(C) Movement in phloem is bidirectional up & down while movement in xylem is
unidirectional up
(D) movement in phloem is unidirectional upward while movement in xylem is
bidirectional up & down.
Phloem sap includes
(A) water, sucrose, hormones
(B) sucrose only
(C) water and sucrose but no hormones
(D) sucrose and hormones but no water
Amino acids are transported by
(A) xylem only (B) phloem only
(C) both xylem & phloem (D) neither xylem nor phloem
The sugar mainly transported is
(A) Glucose (monosaccharide) (B) Glucose (disaccharide)
(C) Sucrose (disaccharide) (D) Sucrose (monosaccharide)
Glucose is converted to sucrose at
(A) the source
(B) the sink
(C) midway in xylem during transport
(D) Sometimes at source and other times at sink
Select the correct pathway for sugar transport by phloem as per the mass flow hypothesis
(A) Sucrose Sieve tube Companion cells via diffusion
(B) Sucrose sieve tube companion cells via active transport
(C) Sucrose Companion cells Sieve tube via diffusion
(D) Sucrose Companion cells Sieve tube via active transport
Loading at source during phloem translocation
(A) makes phloem hypertonic and attract water from xylem
(B) makes phloem hypotonic and attract water from xylem
(C) makes phloem hypertonic and attract water from shoot cells
(D) makes phloem hypotonic and attract water from shoot cells
Choose the correct option for phloem transport
(A) loading is active process and unloading is passive
(B) loading is passive process and unloading is active
(C) Both loading and unloading are active
(D) Both loading and unloading are passive
Choose the incorrect option for phloem transport
(A) transport occurs due to high osmotic pressure in phloem
(B) transport occurs due to low osmotic pressure in xylem.
(C) transport occurs due to water potential gradient
(D) transport occurs due to pressure potential gradient
Identify the correct match
(A) Sugar enter sieve tube, water follows by osmosis
(B) Sugar leaving sieve tube, water follow by osmosis
(i) (ii) (iii) (i) (ii) (iii)
(A) A B B (B) B A A
(C) A B A (D) B A B
Girdling experiment was used to identify
(A) tissue for water transport (B) tissue for food transport
(C) tissue for mineral transport (D) Both (A) and (C)
In girdling experiment, a ring of bark is cut upto the depth of
(A) the xylem layer (B) the phloem layer
(C) the cortex layer (D) the endodermal layer
In girdling experiment, the stem swells
(A) above the ring, and transport is unidirectional towards roots
(B) above the ring, and transport is unidirectional towards shoot
(C) below the ring, and transport is unidirectional towards shoot
(D) Both above and below the ring, and transport is bidirectional towards root and shoot.
Stomatal movement is not affected by :
(a) Temperature (b) Light (c) CO2 concentration (d) O2 concentration
The water potential of pure water is:
(a) less than zero.
(b) more than zero but less than one.
(c) more than one.
(d) zero.
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.
(a) Both processes cannot happen simultaneously.
(b) Both processes can happen together because the diffusion coefficient of water and CO2 is different.
(c) The above processes happen only during night time.
(d) One process occurs during day time, and the other at night.
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
A column of water within xylem vessels of tall trees does not break under its weight because of :
(a) tensile strength of water.
(b) lignification of xylem vessels.
(c) positive root pressure.
(d) dissolved sugars in water.
Root pressure develops due to:
(a) low osmotic potential in soil.
(b) passive absorption.
(c) increase in transpiration.
(d) active absorption.
Roots play insignificant role in absorption of water in :
(a) Pistia
(b) Pea
(c) Wheat
(d) Sunflower
Transpiration and root pressure cause water to rise in plants by:
(a) pulling and pushing it, respectively.
(b) pushing it upward.
(c) pushing and pulling it, respectively.
(d) pushing it upward.
Xylem translocates :-
(1) Water only
(2) Water and mineral salts only
(3) Water, mineral salts and some organic nitrogen only
(4) Water, mineral salts, some organic nitrogen and hormones
What is the direction of movement of sugars in phloem?
(1) Non-multidirectional
(2) Upward
(3) Downward
(4) Bi-directional
Pinus seed cannot germinate and establish without fungal association. This is because :
(1) its embryo is immature
(2) it has obligate association with mycorrhizae.
(3) it has very hard seed coat.
(4) its seeds contain inhibitors that prevent germination .
The main difference between active and passive transport across cell membrane is
(1) Passive transport is non-selective whereas active transport is selective
(2) Passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes
(3) Passive transport is confined to anionic carrier proteins whereas active transport is confined to cationic channel proteins
(4) Active transport occurs more rapidly than passive transport
Match the following :
(a) Aquaporin (i) Amide
(b) Asparagine (ii) Polysaccharide
(c) Abscisic acid (iii) Polypeptide
(d) Chitin (iv) Carotenoids
Select the correct option :
(1) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
(2) (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
(3) (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
(4) (a)-(iii), (b)-(i), (c) -(ii), (d)-(iv)
Select the incorrect statement.
(1) Transport of molecules in phloem can be bidirectional.
(2) Movement of minerals in xylem is unidirectional.
(3) Unloading of sucrose at sink does not involve the utilization of ATP.
(4) Elements most easily mobilized in plants from one region to another are: phosphorus, sulphur,
nitrogen and potassium.
The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is
1) Plasmolysis 2) Transpiration 3) Root pressure 4) Imbibition
Match List – I with List – II.
List – I |
List – II |
||
| (a) | Cohesion | (i) | More attraction in liquid phase |
| (b) | Adhesion | (ii) | Mutual attraction among water molecules |
| (c) | Surface tension | (iii) | Water loss in liquid phase |
| (d) | Guttation | (iv) | Attraction towards polar surfaces |
Choose the correct answer from the options give below.
(a) (b) (c) (d) (a) (b) (c) (d)
1) (iv) (iii) (ii) (i)
2) (iii) (i) (iv) (ii)
3) (ii) (i) (iv) (iii)
4) (ii) (iv) (i) (iii)
Which of the following is not observed during apoplastic pathway?
1) Movement of water occurs through intercellular spaces and wall of the cells.
2) The movement does not involve crossing of cell membrane
3) The movement is aided by cytoplasmic streaming
4) Apoplast is continuous and does not provide any barrier to water movement.
“Girdling Experiment” was performed by plant physiologists to identify the plant tissue through which:
1) Water is transported
2) Food is transported
3) For both water and food transportation
4) Osmosis is observed
Addition of more solutes in a given solution will:
1) raise its water potential
2) lower its water potential
3) make its water potential zero
4) not affect the water potential at all
11.TRANSPORT IN PLANTS QUESTIONS
CHAPTER NOTES
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