The water potential of pure water at standard conditions is:
A
Positive
B
Zero
C
Negative
D
Variable
Question 4Single Answer
Water potential is influenced by:
A
Solute potential and pressure potential
B
Temperature only
C
Light intensity
D
Soil pH
Question 5Single Answer
Solute potential is also known as:
A
Matric potential
B
Turgor potential
C
Osmotic potential
D
Gravitational potential
Question 6Single Answer
Pressure potential in plant cells is due to:
A
Turgor pressure against the cell wall
B
Osmotic pressure only
C
Gravitational force
D
Light intensity
Question 7Single Answer
The movement of water in plants is driven by:
A
Water potential gradient
B
Temperature gradient
C
Light gradient
D
Nutrient gradient
Question 8Single Answer
Water moves from:
A
Higher to lower water potential
B
Lower to higher water potential
C
Equal water potential
D
No movement occurs
Question 9Single Answer
The main pathway for water uptake in roots is:
A
Active transport
B
Transpiration only
C
Guttation
D
Apoplast and symplast
Question 10Single Answer
The apoplast pathway involves water movement through:
A
Cytoplasm of cells
B
Cell walls and intercellular spaces
C
Plasmodesmata
D
Vacuoles
Question 11Single Answer
The symplast pathway involves water movement through:
A
Xylem vessels
B
Cell walls
C
Intercellular spaces
D
Cytoplasm and plasmodesmata
Question 12Single Answer
The Casparian strip in roots forces water to move through:
A
The xylem directly
B
The apoplast pathway
C
The symplast pathway
D
The phloem
Question 13Single Answer
Transpiration is the loss of water from plants in the form of:
A
Liquid through phloem
B
Liquid through roots
C
Gas through xylem
D
Water vapor through stomata
Question 14Single Answer
The main driving force for transpiration is:
A
Capillary action
B
Root pressure
C
Evaporation from leaf surfaces
D
Active transport
Question 15Single Answer
Stomata are primarily located on:
A
Flowers
B
Roots
C
Stems
D
Leaves
Question 16Single Answer
The opening and closing of stomata are regulated by:
A
Xylem cells
B
Epidermal cells
C
Mesophyll cells
D
Guard cells
Question 17Single Answer
Turgor pressure in guard cells is controlled by:
A
Calcium ion movement
B
Sodium ion movement
C
Potassium ion movement
D
Chloride ion movement
Question 18Single Answer
Wilting in plants occurs due to:
A
Excess water uptake
B
Loss of turgor pressure
C
High solute potential
D
Increased transpiration
Question 19Single Answer
Root pressure is responsible for:
A
Osmosis
B
Transpiration
C
Guttation
D
Diffusion
Question 20Single Answer
Guttation is the exudation of:
A
Sap from xylem
B
Water vapor from stomata
C
Liquid water from hydathodes
D
Sugars from phloem
Question 21Single Answer
The cohesion-tension theory explains:
A
Water movement in xylem
B
Sugar transport in phloem
C
Nutrient uptake in roots
D
Gas exchange in leaves
Question 22Single Answer
The cohesion-tension theory is driven by:
A
Transpiration and cohesive properties of water
B
Root pressure only
C
Active transport
D
Osmotic pressure only
Question 23Single Answer
Water molecules exhibit cohesion due to:
A
Van der Waals forces
B
Ionic bonding
C
Covalent bonding
D
Hydrogen bonding
Question 24Single Answer
The main tissue for water transport in plants is:
A
Parenchyma
B
Phloem
C
Xylem
D
Collenchyma
Question 25Single Answer
Xylem vessels are:
A
Photosynthetic cells
B
Living cells
C
Dead, lignified cells
D
Storage cells
Question 26Single Answer
The rate of transpiration is highest under:
A
High humidity and low temperature
B
Low humidity and high temperature
C
High humidity and high temperature
D
Low humidity and low temperature
Question 27Single Answer
The matric potential in plant-water relations is due to:
A
Solute concentration
B
Surface tension in cell walls
C
Turgor pressure
D
Gravitational force
Question 28Single Answer
Plasmolysis occurs when a plant cell is placed in:
A
Hypertonic solution
B
Hypotonic solution
C
Isotonic solution
D
Pure water
Question 29Single Answer
Incipient plasmolysis is the stage where:
A
The cell membrane just begins to pull away from the cell wall
B
The cell bursts
C
The cell becomes fully turgid
D
The cell dies
Question 30Single Answer
What is primarily responsible for maintaining turgidity in a plant cell?
A
Outward diffusion of solutes
B
Turgor pressure generated by water entry
C
Loss of water from the vacuole
D
Breakdown of the cell wall
Question 31Single Answer
The main source of water for plants is:
A
Atmospheric water
B
Rainwater
C
Soil water
D
Ground water
Question 32Single Answer
The water absorption by roots is primarily through:
A
Xylem vessels
B
Root hairs
C
Phloem cells
D
Epidermal cells
Question 33Single Answer
The process of water movement through the apoplast is:
A
Active and selective
B
Passive and non-selective
C
Active and non-selective
D
Passive and selective
Question 34Single Answer
The endodermis in roots acts as a:
A
Barrier to water and solute movement
B
Conduit for water
C
Storage tissue
D
Photosynthetic tissue
Question 35Single Answer
What is the water potential of a fully turgid plant cell when it is in equilibrium with pure water at standard conditions?
A
Zero
B
Always positive
C
Highly negative
D
Equal to its solute potential
Question 36Single Answer
Which two components are generally the major determinants of water potential in a typical plant cell?
A
Solute potential and pressure potential
B
Light potential and thermal potential
C
Electrical potential and respiratory potential
D
Pigment potential and metabolic potential
Question 37Single Answer
The xylem transport of water is:
A
Passive and driven by transpiration pull
B
Active and energy-dependent
C
Driven by root pressure only
D
Driven by solute concentration
Question 38Single Answer
The primary function of transpiration in plants is:
A
Sugar transport
B
Photosynthesis
C
Cooling and nutrient transport
D
Cell division
Question 39Single Answer
The antitranspirants are used to:
A
Enhance photosynthesis
B
Increase transpiration
C
Reduce transpiration rate
D
Promote guttation
Question 40Single Answer
Membrane transport in plants involves:
A
DNA replication
B
Synthesis of cell walls
C
Photosynthetic reactions
D
Movement of substances across cell membranes
Question 41Single Answer
The plasma membrane is:
A
Rigid and impermeable
B
Fully permeable
C
Impermeable
D
Selectively permeable
Question 42Single Answer
Passive transport across membranes occurs:
A
With energy input
B
Without energy input
C
Only for water
D
Only for ions
Question 43Single Answer
Active transport in plants requires:
A
ATP energy
B
Light energy
C
Heat energy
D
No energy
Question 44Single Answer
Diffusion is the movement of molecules from:
A
Low to high concentration
B
High to low concentration
C
Equal concentration
D
No movement
Question 45Single Answer
Osmosis is the diffusion of:
A
Ions only
B
Solutes across a membrane
C
Water across a semi-permeable membrane
D
Gases only
Question 46Single Answer
Facilitated diffusion involves:
A
Carrier proteins or channels
B
Active transport
C
ATP energy
D
Direct diffusion
Question 47Single Answer
An example of a molecule transported by facilitated diffusion is:
A
Carbon dioxide
B
Oxygen
C
Glucose
D
Nitrogen
Question 48Single Answer
Active transport in plants is used for:
A
Sugar synthesis
B
Water uptake
C
Gas exchange
D
Ion uptake against concentration gradient
Question 49Single Answer
The proton pump in plant cells is an example of:
A
Facilitated diffusion
B
Passive transport
C
Active transport
D
Osmosis
Question 50Single Answer
The sodium-potassium pump is primarily found in:
A
Animal cells
B
Plant cells
C
Bacterial cells
D
Fungal cells
Important Questions Package
RPSC Assistant Professor Botany Exam Online Question Bank Package
Buy RPSC Assistant Professor Botany Important Questions, MCQ, question answer in Hindi & English. It will help you to score high marks in RPSC Assistant Professor Botany question bank 2026 in Online, PDF & Print study material.
+ Free Monthly Current Affairs, GK & more PDF Download
Sr.
Package Name
Amount
1.
RPSC Assistant Professor (Botany) Exam Paper I - Hindi
Description : 1000 Question With Answer
₹101[₹500]
2.
RPSC Assistant Professor (Botany) Exam Paper I - Hindi
Description : 1800 Question With Answer
₹131[₹500]
3.
RPSC Assistant Professor (Botany) Exam Paper I - English
Description : 1000 Question With Answer
₹101[₹500]
4.
RPSC Assistant Professor (Botany) Exam Paper I - English
Description : 1800 Question With Answer
₹131[₹500]
5.
RPSC Assistant Professor (Botany) Exam Paper II - English
Description : 1000 Question With Answer
₹101[₹500]
6.
RPSC Assistant Professor (Botany) Exam Paper II - English
Description : 1800 Question With Answer
₹131[₹500]
7.
RPSC Assistant Professor (Botany) Exam Paper II - Hindi
Description : 1800 Question With Answer
₹131[₹500]
8.
RPSC Assistant Professor (Botany) Exam Paper II - Hindi
Description : 1000 Question With Answer
₹101[₹500]
9.
RPSC Assistant Professor (Botany) Exam Paper III - Hindi
Description : 1000 Question With Answer
₹101[₹500]
10.
RPSC Assistant Professor (Botany) Exam Paper III - English
Description : 1000 Question With Answer
₹101[₹500]
11.
RPSC Assistant Professor (Botany) Exam Paper I - Hindi
Description : 1000 Question & Answer Download in PDF (Send by Email)
₹151[₹550]
12.
RPSC Assistant Professor (Botany) Exam Paper II - Hindi
Description : 1000 Question & Answer Download in PDF (Send by Email)
₹151[₹550]
13.
RPSC Assistant Professor (Botany) Exam Paper I - English
Description : 1000 Question & Answer Download in PDF (Send by Email)
₹151[₹550]
14.
RPSC Assistant Professor (Botany) Exam Paper II - English
Description : 1000 Question & Answer Download in PDF (Send by Email)
₹151[₹550]
15.
RPSC Assistant Professor (Botany) Exam Paper III - Hindi
Description : 1000 Question & Answer Download in PDF (Send by Email)
₹151[₹550]
16.
RPSC Assistant Professor (Botany) Exam Paper III - English
Description : 1000 Question & Answer Download in PDF (Send by Email)
₹151[₹550]
17.
RPSC Assistant Professor (Botany) Exam Paper I Question Bank Book - Hindi
Description : 1000 Question with Answer (Printed Material)
₹450[₹850]
18.
RPSC Assistant Professor (Botany) Exam Paper II Question Bank Book - Hindi
Description : 1000 Question with Answer (Printed Material)
₹450[₹850]
19.
RPSC Assistant Professor (Botany) Exam Paper I Question Bank Book - English
Description : 1000 Question with Answer (Printed Material)
₹390[₹650]
20.
RPSC Assistant Professor (Botany) Exam Paper II Question Bank Book - English
Description : 1000 Question with Answer (Printed Material)
₹390[₹650]
21.
RPSC Assistant Professor (Botany) Exam Paper III Question Bank Book - Hindi
Description : 1000 Question with Answer (Printed Material)
₹450[₹850]
22.
RPSC Assistant Professor (Botany) Exam Paper III Question Bank Book - English
Description : 1000 Question with Answer (Printed Material)
₹390[₹650]
23.
RPSC Assistant Professor Botany (Paper III) Exam - Hindi (old)
Description : 1000 Question with Answer.
₹101[₹500]
Botany
Question 51Single Answer
The primary active transport in plant cells involves:
A
H+ ATPase pump
B
Sodium-potassium pump
C
Calcium pump
D
Chloride pump
Question 52Single Answer
The H+ ATPase pump creates:
A
A light gradient
B
A water gradient
C
A sugar gradient
D
A proton gradient across the membrane
Question 53Single Answer
Secondary active transport in plants involves:
A
Osmosis
B
Direct ATP use
C
Passive diffusion
D
Cotransport with H+ ions
Question 54Single Answer
An example of a cotransporter in plants is:
A
Sucrose-H+ symporter
B
Sodium-potassium pump
C
Water channel
D
Oxygen transporter
Question 55Single Answer
Aquaporins are:
A
Proton pumps
B
Ion channels
C
Sugar transporters
D
Water channel proteins
Question 56Single Answer
The movement of ions across membranes is regulated by:
A
Sugar transporters
B
Water channels
C
Ion channels and pumps
D
Lipid bilayers
Question 57Single Answer
The membrane potential in plant cells is maintained by:
A
Sugar transporters
B
Water channels
C
Proton pumps
D
Lipid synthesis
Question 58Single Answer
The tonoplast is the membrane surrounding:
A
The chloroplast
B
The nucleus
C
The vacuole
D
The mitochondria
Question 59Single Answer
During stomatal opening, uptake of K⁺ into guard cells is mediated primarily by?
A
Inward-rectifying potassium channels driven by the membrane electrochemical gradient
B
Osmosis through aquaporins
C
Direct hydrolysis of ATP by potassium ions
D
Sucrose-H⁺ symporters
Question 60Single Answer
The lipid bilayer of the plasma membrane is primarily composed of:
A
Nucleic acids
B
Proteins
C
Carbohydrates
D
Phospholipids
Question 61Single Answer
The fluid mosaic model describes the:
A
Transport of sugars
B
Movement of water
C
Structure of the plasma membrane
D
Synthesis of ATP
Question 62Single Answer
The primary role of aquaporins in plants is:
A
Transporting sugars
B
Transporting ions
C
Facilitating water transport
D
Producing energy
Question 63Single Answer
Which mechanism commonly enables nitrate uptake from the soil into root cells?
A
H⁺-nitrate cotransport
B
Osmosis
C
Simple diffusion through membrane lipids
D
Aquaporin-mediated transport
Question 64Single Answer
The movement of water through aquaporins is:
A
Active
B
Passive
C
Energy-dependent
D
Ion-dependent
Question 65Single Answer
Which proton pump is characteristically present in the plasma membrane of plant cells?
A
P-type H⁺-ATPase
B
Na⁺/K⁺-ATPase
C
F-type H⁺-ATP synthase
D
Ca²⁺-ATPase only
Question 66Single Answer
In the apoplastic pathway of phloem loading, sucrose uptake into companion cells is primarily accomplished by?
A
Sucrose-H⁺ symport
B
Simple diffusion through the lipid bilayer
C
Osmosis
D
Potassium channels
Question 67Single Answer
The membrane transport of calcium ions in plants is regulated by:
A
Water channels
B
Calcium channels and pumps
C
Sugar transporters
D
Proton pumps only
Question 68Single Answer
The primary source of energy for active transport is:
A
Light
B
ATP
C
Heat
D
Water
Question 69Single Answer
The transport of amino acids in plants is an example of:
A
Osmosis
B
Passive diffusion
C
Secondary active transport
D
Facilitated diffusion
Question 70Single Answer
The symporter in plants transports:
A
Water only
B
Two molecules in opposite directions
C
One molecule only
D
Two molecules in the same direction
Question 71Single Answer
The antiporter in plants transports:
A
Water only
B
Two molecules in the same direction
C
One molecule only
D
Two molecules in opposite directions
Question 72Single Answer
Uptake of inorganic phosphate by plant root cells commonly occurs through?
A
H⁺-phosphate symport
B
Aquaporin-mediated transport
C
Simple diffusion through the lipid bilayer
D
Na⁺/K⁺ pumping
Question 73Single Answer
The membrane transport in plants is influenced by:
A
Cell wall thickness
B
Membrane proteins and concentration gradients
C
Chloroplast structure
D
Nuclear size
Question 74Single Answer
The primary role of ion channels in plants is:
A
ATP production
B
Water transport
C
Sugar synthesis
D
Selective ion transport
Question 75Single Answer
The transport of water across the tonoplast is facilitated by:
A
Aquaporins
B
Ion channels
C
Sugar transporters
D
Proton pumps
Question 76Single Answer
The membrane potential in plant cells is typically:
A
Negative inside the cell
B
Positive inside the cell
C
Neutral
D
Variable
Question 77Single Answer
Which statement best describes chloride transport across plant cell membranes?
A
Chloride can move through channels or coupled transporters depending on the membrane and electrochemical gradient
B
Chloride is always transported by primary active transport
C
Chloride crosses membranes only by osmosis
D
Chloride freely diffuses through the phospholipid bilayer
Question 78Single Answer
The primary role of the plasma membrane in transport is:
A
Non-selective transport
B
Complete impermeability
C
Selective permeability
D
Water storage
Question 79Single Answer
Which mechanism can directly energize sucrose accumulation in plant vacuoles?
A
Proton-coupled transport across the tonoplast
B
Simple diffusion through phospholipids
C
Osmosis
D
Potassium-channel transport
Question 80Single Answer
Translocation in plants refers to:
A
Short-distance transport within cells
B
Long-distance transport of water and solutes
C
Photosynthesis
D
Cell division
Question 81Single Answer
Water translocation in plants occurs primarily through:
A
Xylem
B
Phloem
C
Parenchyma
D
Collenchyma
Question 82Single Answer
Solute translocation in plants occurs primarily through:
A
Epidermis
B
Xylem
C
Phloem
D
Cortex
Question 83Single Answer
The primary solute translocated in the phloem is:
A
Sucrose
B
Water
C
Amino acids
D
Minerals
Question 84Single Answer
The pressure flow hypothesis explains:
A
Solute transport in phloem
B
Water transport in xylem
C
Gas exchange in leaves
D
Nutrient uptake in roots
Question 85Single Answer
The pressure flow hypothesis was proposed by:
A
Jagadish Chandra Bose
B
Ernst Münch
C
Melvin Calvin
D
Robert Hooke
Question 86Single Answer
In the pressure flow hypothesis, the source is:
A
Where sugars are stored (e.g., roots)
B
Where sugars are produced (e.g., leaves)
C
Where water is absorbed
D
Where minerals are stored
Question 87Single Answer
In the pressure flow hypothesis, the sink is:
A
Where sugars are produced
B
Where sugars are used or stored (e.g., roots, fruits)
C
Where water is absorbed
D
Where minerals are transported
Question 88Single Answer
The loading of sucrose into the phloem is:
A
Passive and non-selective
B
Active and energy-dependent
C
Osmotic only
D
Facilitated diffusion
Question 89Single Answer
The unloading of sucrose from the phloem is:
A
Always passive
B
Always active
C
Passive or active depending on the sink
D
Osmotic only
Question 90Single Answer
The companion cells in phloem assist in:
A
Water transport
B
Sucrose loading and unloading
C
Gas exchange
D
Cell division
Question 91Single Answer
The sieve tubes in phloem are:
A
Storage cells
B
Dead cells
C
Photosynthetic cells
D
Living cells without nuclei
Question 92Single Answer
The main driving force for phloem transport is:
A
Root pressure
B
Transpiration pull
C
Turgor pressure gradient
D
Capillary action
Question 93Single Answer
The translocation of minerals in plants occurs primarily through:
A
Cortex
B
Phloem
C
Xylem
D
Epidermis
Question 94Single Answer
Which of the following is a common inorganic nitrogen ion transported from roots through the xylem?
A
Nitrate
B
Sucrose
C
Glucose
D
Starch
Question 95Single Answer
The translocation of water in xylem is driven by:
A
Transpiration pull and cohesion
B
Active transport
C
Osmotic pressure only
D
Root pressure only
Question 96Single Answer
The phloem sap contains:
A
Gases
B
Water only
C
Minerals only
D
Sucrose, amino acids, and hormones
Question 97Single Answer
The rate of phloem transport is influenced by:
A
Source-sink relationship
B
Transpiration rate
C
Root pressure
D
Capillary action
Question 98Single Answer
The xylem sap contains:
A
Gases
B
Sucrose and amino acids
C
Water and minerals
D
Hormones only
Question 99Single Answer
The translocation of water in plants is:
A
Active and energy-dependent
B
Passive and driven by transpiration
C
Osmotic only
D
Facilitated diffusion
Question 100Single Answer
The sieve plates in phloem allow:
A
Gas exchange
B
Water transport
C
Flow of sap between sieve tube elements
D
Cell division
Question 101Single Answer
The main energy source for phloem loading is:
A
Heat
B
Light
C
ATP
D
Water
Question 102Single Answer
The translocation of hormones in plants occurs through:
A
Xylem
B
Phloem
C
Cortex
D
Epidermis
Question 103Single Answer
The main function of companion cells is:
A
Metabolic support for sieve tubes
B
Water transport
C
Gas exchange
D
Photosynthesis
Question 104Single Answer
The xylem tracheids are:
A
Photosynthetic cells
B
Living cells
C
Dead cells with pitted walls
D
Storage cells
Question 105Single Answer
The translocation of amino acids occurs primarily through:
A
Xylem
B
Phloem
C
Cortex
D
Epidermis
Question 106Single Answer
The main factor affecting phloem transport is:
A
Capillary action
B
Transpiration rate
C
Root pressure
D
Turgor pressure
Question 107Single Answer
The translocation of water in tall trees is supported by:
A
Root pressure only
B
Active transport
C
Osmotic pressure only
D
Cohesion and adhesion of water molecules
Question 108Single Answer
The main sink tissues in plants include:
A
Leaves
B
Roots, fruits, and tubers
C
Stems
D
Flowers
Question 109Single Answer
The translocation of sugars in phloem is:
A
Non-directional
B
Unidirectional
C
Bidirectional
D
Osmotic only
Question 110Single Answer
The xylem transport is:
A
Bidirectional
B
Unidirectional
C
Non-directional
D
Osmotic only
Question 111Single Answer
The main protein in phloem sap is:
A
P-protein
B
Actin
C
Tubulin
D
Histone
Question 112Single Answer
The function of P-protein in phloem is:
A
Cell division
B
Transporting water
C
Photosynthesis
D
Sealing damaged sieve tubes
Question 113Single Answer
The translocation of water in xylem is affected by:
A
Sugar concentration
B
Soil pH
C
Light intensity
D
Environmental humidity
Question 114Single Answer
The main source tissue for phloem transport is:
A
Xylem vessels
B
Root hairs
C
Mesophyll cells of leaves
D
Epidermal cells
Question 115Single Answer
The translocation of solutes in phloem is driven by:
A
Capillary action
B
Transpiration pull
C
Root pressure
D
Turgor pressure gradient
Question 116Single Answer
The xylem vessels are connected by:
A
Pits only
B
Sieve plates
C
Plasmodesmata
D
Perforation plates
Question 117Single Answer
The main factor affecting xylem transport is:
A
Turgor pressure
B
Transpiration rate
C
Sugar concentration
D
Soil pH
Question 118Single Answer
The translocation of organic acids in plants occurs through:
A
Epidermis
B
Xylem
C
Cortex
D
Phloem
Question 119Single Answer
The main role of xylem in plants is:
A
Transport of water and minerals
B
Transport of sugars
C
Photosynthesis
D
Storage of nutrients
Question 120Single Answer
The primary role of root hairs in plant-water relations is:
A
Cell division
B
Photosynthesis
C
Sugar transport
D
Increasing surface area for water absorption
Question 121Single Answer
The cohesion-tension theory is associated with:
A
Guttation
B
Phloem transport
C
Root pressure
D
Xylem transport
Question 122Single Answer
The pressure flow hypothesis is associated with:
A
Xylem transport
B
Phloem transport
C
Root pressure
D
Guttation
Question 123Single Answer
The Casparian strip is located in:
A
Leaf epidermis
B
Root endodermis
C
Xylem vessels
D
Phloem sieve tubes
Question 124Single Answer
The main function of aquaporins in plant cells is:
A
Facilitating water transport across membranes
B
Transporting sugars
C
Transporting ions
D
Producing ATP
Question 125Single Answer
The H+ ATPase pump is critical for:
A
Xylem transport
B
Phloem loading and membrane potential
C
Photosynthesis
D
Cell division
Question 126Single Answer
The primary solute in phloem sap is:
A
Sucrose
B
Water
C
Nitrate
D
Potassium
Question 127Single Answer
The main driving force for water movement in xylem is:
A
Transpiration pull
B
Turgor pressure
C
Root pressure
D
Osmotic pressure
Question 128Single Answer
The primary role of guard cells in plant-water relations is:
A
Transporting sugars
B
Regulating transpiration
C
Absorbing water
D
Producing energy
Question 129Single Answer
The symplast pathway is important for:
A
Selective transport of water and solutes
B
Non-selective transport
C
Gas exchange
D
Photosynthesis
Question 130Single Answer
The apoplast pathway is important for:
A
Ion transport
B
Sugar transport
C
Rapid water movement in roots
D
Gas exchange
Question 131Single Answer
The main tissue for solute transport in plants is:
A
Xylem
B
Phloem
C
Cortex
D
Epidermis
Question 132Single Answer
The translocation of water in plants is affected by:
A
Light intensity only
B
Sugar concentration
C
Soil pH only
D
Environmental factors like humidity
Question 133Single Answer
The primary role of the endodermis in water transport is:
A
Photosynthesis
B
Transporting sugars
C
Controlling water and solute entry to xylem
D
Cell division
Question 134Single Answer
The main energy source for phloem transport is:
A
ATP
B
Light
C
Heat
D
Water
Question 135Single Answer
The translocation of minerals in xylem is:
A
Osmotic only
B
Active and energy-dependent
C
Passive and driven by transpiration
D
Facilitated diffusion
Question 136Single Answer
The main role of companion cells in phloem transport is:
A
Loading and unloading solutes
B
Transporting water
C
Photosynthesis
D
Cell division
Question 137Single Answer
The water potential of a wilting plant is:
A
Negative
B
Positive
C
Zero
D
Variable
Question 138Single Answer
The primary role of transpiration in nutrient transport is:
A
Photosynthesis
B
Transporting sugars
C
Driving mineral uptake in xylem
D
Cell division
Question 139Single Answer
The main factor affecting phloem loading is:
A
Capillary action
B
Transpiration rate
C
Root pressure
D
Proton gradient
Question 140Single Answer
The xylem vessels are specialized for:
A
Photosynthesis
B
Sugar transport
C
Gas exchange
D
Water and mineral transport
Question 141Single Answer
The sieve tubes in phloem are specialized for:
A
Water transport
B
Solute transport
C
Gas exchange
D
Photosynthesis
Question 142Single Answer
The main environmental factor affecting transpiration is:
A
Sugar concentration
B
Soil pH
C
Light intensity only
D
Humidity
Question 143Single Answer
The primary role of the tonoplast in solute transport is:
A
Transporting water
B
Regulating vacuolar storage
C
Photosynthesis
D
Cell division
Question 144Single Answer
The translocation of water in plants is affected by:
A
Sugar concentration
B
Stomatal opening and closing
C
Soil pH only
D
Light intensity only
Question 145Single Answer
The main role of the proton pump in phloem transport is:
A
Photosynthesis
B
Transporting water
C
Creating a proton gradient for sucrose loading
D
Cell division
Question 146Single Answer
The primary sink for sucrose in a growing plant is:
A
Leaves
B
Developing fruits and roots
C
Stems
D
Flowers
Question 147Single Answer
The main role of xylem in plant-water relations is:
A
Sugar transport
B
Long-distance water transport
C
Gas exchange
D
Photosynthesis
Question 148Single Answer
The translocation of hormones like auxin occurs through:
A
Phloem
B
Xylem
C
Cortex
D
Epidermis
Question 149Single Answer
The main factor affecting water potential in roots is:
A
Soil pH
B
Sugar concentration
C
Light intensity
D
Soil water availability
Question 150Single Answer
The primary role of aquaporins in water transport is:
A
Transporting sugars
B
Facilitating rapid water movement across membranes
