NEET Biology Transport in Plants MCQs Set D

Question: Turgor pressure is the

• a) Positive pressure
• b) Atmospheric pressure
• c) Negative pressureImbibition pressure
• d) Imbibition pressure

Answer: Positive pressure

Question: Plant seeds when sown in soil, germinate and come out of it; due to

• a) Imbibition pressure
• b) Atmospheric pressure
• c) Turgor pressure
• d) Osmotic pressure

Answer: Imbibition pressure

Question: In mass flow, various substances move independently according to their

• a) Concentration gradient
• b) Size
• c) Root pressure
• d) Carrier proteins

Answer: Concentration gradient

Question: In mycorrhiza, fungal filaments help in

• a) Water absorption
• b) Food translocation
• c) Development of root pressure
• d) Developing tension in xylem

Answer: Water absorption

Question: Non-living components of xylem tissues are involved in

• a) Apoplast pathway
• b) Osmosis
• c) Active transport
• d) Symplast pathway

Answer: Apoplast pathway

Question: Water reaches xylem from root hairs by

• a) Both
• b) Symplast pathway
• c)  Apoplast pathway
• d) None of these

Answer: Both

Question: Symplast pathway of water in plants is not related to

• a) Cell wall
• b) Plasmodesmata
• c) Cytoplasm
• d) Vacuolar path

Answer: Cell wall

Question: Guttation happens due to the development of

• a) Positive hydrostatic pressure in xylem
• b) Low root pressure
• c) Negative hydrostatic pressure in xylem
• d) Intense transpiration pull

Answer: Positive hydrostatic pressure in xylem

Question: Hydathodes help in

• a) Guttation
• b) More than one option is correct
• c) Bleeding
• d) Protection against grazing

Answer: Guttation

Question: Select an incorrect statement

• a) Inner wall of the guard cell is thin and elastic in dicots
• b) Guard cells are dumb-bell shaped in monocots
• c) Cellulosic microfibrils are arranged radially in guard cells
• d) Guard cells are surrounded by subsidiary cells

Answer: Inner wall of the guard cell is thin and elastic in dicots

Question: The outer wall of guard cell in sunflower is

• a) Thin and elastic
• b) Thick and elastic
• c) Thin and inelastic
• d) Thick and inelastic

Answer: Thin and elastic

Question: Stomata when open lead to

• a) All of these
• b) Evaporation of water
• c) Exchange of gases
• d) Uptake of carbon dioxide

Answer: All of these

Question: Rate of transpiration is increased by

• a) Sunlight
• b) Darkness
• c) High humidity
• d) High speed winds

Answer: Sunlight

Question: Water is mainly transported to shoot tips by the help of

• a) Transpiration pull
• b) Canopy structure
• c) Root pressure
• d) Capillarity

Answer: Transpiration pull

Question: Xylem helps in translocation of

• a) More than one option is correct
• b) Water and mineral salts
• c) Some hormones
• d) Amides

Answer: More than one option is correct

Question: The water rises in straw due to suction, it is due to

• a) Negative hydrostatic pressure
• b) Diffusion pressure
• c) Positive hydrostatic pressure
• d) Zero hydrostatic pressure

Answer:  Negative hydrostatic pressure

Question: Transport proteins of _________are control points, where a plant adjusts the quantity and types of solutes that reach the xylem

• a) Endodermis
• b) Hypodermis
• c) Pith
• d) Pericycle

Answer: Endodermis

Question: The casparian strips of root endodermis is made up of

• a) Suberin
• b) Cellulose
• c) Chitin
• d) Keratin

Answer: Suberin

Question: Ions are absorbed from the soil by

• a) Both
• b) Active transport
• c) Passive transport
• d) None of these

Answer: Both

Question: Remobilised minerals become available to

• a) Young leaves
• b) Older parts of plant
• c) Dried leaves
• d) Chlorotic leaves

Answer: Young leaves

Question: An analysis of the xylem exudates shows that much of the nitrogen travels as

• a) Organic form i.e., amino acids and amides
• b) Inorganic ions
• c) Nitrate and nitrites
• d) Molecular nitrogen

Answer: Organic form i.e., amino acids and amides

Question: A plant organ having high concentration of food, will serve as a

• a) Source
• b) Sink
• c) Conducting tissue
• d) Plasmodesmata

Answer: Source

Question: Sucrose moves into sieve tube elements by

• a) Active transport
• b) Exosmosis
• c) Endosmosis
• d) Diffusion

Answer:  Active transport

Question: Translocation of photosynthates occur in the form of

• a) Sucrose
• b) 3 PGA
• c) Glucose
• d) Starch

Answer: Sucrose

Question: Find odd one w.r.t. chief sink for mineral elements

• a) Mature or older leaves
• b) Young leaves
• c) Apical and lateral meristem
• d) Fruits and seeds

Answer: Mature or older leaves

Question:

• a) Facilitated diffusion; A–Transport protein
• b) Active transport; A–Transport pumps
• c)  Simple diffusion; A – Transport protein
• d) Facilitated diffusion; A–Transport pumps

Answer: Facilitated diffusion; A–Transport protein

Question: Facilitated diffusion is characterized by all, except

• a) Uphill transport
• b) Highly selective nature
• c) Requirement of membrane proteins
• d) No requirement of energy

Answer: Uphill transport

Question: Which is not true regarding active water absorption?

• a) Force develops in shoot
• b) Occurs only when transpiration is slowRequire energy
• c) Require energy
• d) Living cells are essential

Answer: Force develops in shoot

Question: A perfect partition between osmotically active system and pure water in physical conditions can be formed by a

• a) Semipermeable membrane
• b) Selective permeable membrane
• c) Freely permeable membrane
• d) Impermeable membrane

Answer:  Semipermeable membrane

Question: Water channels are

• a) Involved in facilitated diffusion
• b) Made up of eight similar types of aquaporins
• c) Involved in active transport
• d) More than one option is correct

Answer: Involved in facilitated diffusion

Question:

• a) Increases
• b) Decreases
• c) Remains same
• d) Become zero

Answer: Increases

Question: Which of the following equation is wrong?

• a) DPD = – OP + TP
• b)

  

• c)

  

• d)

  

Answer: DPD = – OP + TP

Question:  Correct expression for water potential of plasmolysed cell will be

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: When a cell is fully turgid, which of the following will be zero?

• a) Suction pressure
• b) Wall pressure
• c) Turgor pressure
• d) Osmotic pressure

Answer:  Suction pressure

Question:

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Which is a correct order (w.r.t. imbibing capacity in decreasing order)?

• a) Agar-agar > Pectin > Proteins > Starch > Cellulose
• b) Agar-agar > Protein > Pectin > Cellulose > Starch
• c) Proteins > Agar-agar > Pectin > Starch > Cellulose
• d) Agar-agar > Starch > Protein > Cellulose > Pectin

Answer: Agar-agar > Pectin > Proteins > Starch > Cellulose

Question: Which is not a characteristic of imbibition?

• a) It is a property of hydrophobic and lyophobic colloids
• b) Involves both capillarity and adsorption
• c) Heat is generated
• d) It is a reversible phenomenon

Answer: It is a property of hydrophobic and lyophobic colloids

Question: Phenomenon not associated with root pressure is

• a) Transpiration
• b) Guttation
• c) Bleeding
• d) Sap exudation

Answer: Transpiration

Question:  Which is not true for root pressure?

• a) Maximum during the day and minimum during night
• b) Positive hydrostatic pressure
• c) Magnitude is 1-2 bars
• d) Develops due to metabolic activity of roots

Answer: Maximum during the day and minimum during night

Question: Phenomenon of guttation

• a) Takes place to release excessive solutes
• b) Is regulated by Cohesion-Tension
• c) Is due to active solute accumulation by phloem
• d) More than one option is correct

Answer: Takes place to release excessive solutes

Question: Which of the following statement for hydathodes is correct?

• a) More than one option is correct
• b) These are found at the tips of the veins in leaves
• c) Contains a loosely arranged parenchyma called epithem
• d) Opens to release excessive pure water from leaves

Answer: More than one option is correct

Question: In a stomatal apparatus, cellulosic microfibrils are oriented

• a) Radially in the cell walls of guard cells
• b) Longitudinally on both guard cells
• c) Longitudinally on subsidiary cells
• d) Radially and longitudinally in wall of guard cells

Answer:  Radially in the cell walls of guard cells

Question: According to potassium pump theory of Levitt

• a) Movement of H⁺ ions from guard cell to subsidiary cell is active
• b) Malic acid dissociates into malate ion and protons in the subsidiary cells
• c) Starch is incompletely oxidized to PEP during night
• d) Potassium malate decreases the OP of guard cells during day

Answer: Movement of H⁺ ions from guard cell to subsidiary cell is active

Question:

A. In dry atmosphere, the relative humidity is low, so the rate of transpiration increases
B. Slow breeze promotes the rate of transpiration
C. ABA promotes transpiration
D. A high salt concentration in soil water increases transpiration

• a) A and B are correct
• b) A and C are correct
• c) B and C are correct
• d) C and D are correct

Answer: A and B are correct

Question: The conditions under which transpiration would be most rapid are

• a) Low humidity, high temperature, turgid guard cells and moist soil
• b) Excess of water in soil
• c) Low velocity of wind
• d) High humidity

Answer: Low humidity, high temperature, turgid guard cells and moist soil

Question:

A. Most researchers agree that water is mainly ‘pulled’ upward through the plant, where transpiration is the driving force.
B. Less than one percent of water reaching the leaves is used in plant growth and photosynthesis.
C. Cobalt chloride paper turns blue on absorbing water.

• a) Only C is incorrect
• b) All are correct
• c) Only A is correct
• d) Only B is incorrect

Answer: Only C is incorrect

Question: During stomatal opening (photoactive) which does not occur?

• a) Increased TP of subsidiary cells
• b) Increase in pH of guard cells
• c) Hydrolysis of starch in guard cells
• d) Dissociation of malic acid in guard cells

Answer: Increased TP of subsidiary cells

Question: Select incorrect statement w.r.t. translocation of mineral ions

• a) Most of the nitrogen travels as inorganic ions through xylem
• b) Small amount of P and S are carried as organic compounds through xylem.
• c) Most readily mobilised elements are N, P, K.
• d) The chief sinks for the mineral elements are the apical and lateral meristems

Answer:  Most of the nitrogen travels as inorganic ions through xylem

Question:

• a) A – Unidirectional, B – Multidirectional
• b) A – Multidirectional, B – Multidirectional
• c) A – Unidirectional, B – Unidirectional
• d) A – Multidirectional, B – Unidirectional

Answer:  A – Unidirectional, B – Multidirectional

Question:  According to the pressure flow hypothesis

A. Phloem loading produces a hypertonic condition in the sieve tubes.
B. Water potential gradient facilitates the mass movement in the phloem.
C. Phloem unloading is a passive process.

• a) A & B are correct
• b) A & C are correct
• c) B & C are incorrect
• d) A & B are incorrect

Answer: A & B are correct

Question: Phloem loading and unloading process are respectively

• a) Active, Active
• b) Passive, Passive
• c) Passive, Active
• d) Active, Passive

Answer: Active, Active

Question: Incorrect statement in relation to stomatal apparatus is

• a) Cellulose microfibrils are arranged longitudinally to axis of stomata
• b) Subsidiary cells are located as modified epidermal cells
• c) Guard cells may be ellipsoidal in monocots
• d) Inner walls of guard cells are thick and elastic

Answer:  Cellulose microfibrils are arranged longitudinally to axis of stomata

Question:

A. Much of nitrogen in xylem sap is carried in organic form.
B. In phloem, movement of nutrients is always unidirectional

• a) Only A is correct
• b) Both A & B are correct
• c) Only B is correct
• d) Both A & B are incorrect

Answer:  Only A is correct