Plant Physiology Part 1
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Question No. 1
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Which process involves the movement of molecules from a region of higher concentration to a region of lower concentration?
A.
Osmosis
B.
Diffusion
C.
Imbibition
D.
Plasmolysis
Question No. 2
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Osmosis is a specialized type of diffusion that involves the movement of:
A.
Solutes across a membrane
B.
Water across a semi-permeable membrane
C.
Gases across a membrane
D.
Ions against a concentration gradient
Question No. 3
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What is the primary role of a semi-permeable membrane in osmosis?
A.
To allow all molecules to pass freely
B.
To restrict the movement of all molecules
C.
To allow selective passage of molecules, particularly water
D.
To actively transport molecules against a concentration gradient
Question No. 4
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Which scenario exemplifies endosmosis?
A.
A cell shrinking in a hypertonic solution
B.
Raisins swelling when placed in water
C.
Water moving out of a cell into a hypertonic solution
D.
Ions being actively transported into a cell
Question No. 5
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What is the fate of a cell placed in a hypertonic solution?
A.
It swells due to endosmosis
B.
It shrinks due to exosmosis
C.
It remains unchanged
D.
It bursts due to excessive water intake
Question No. 6
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Plasmolysis is characterized by:
A.
Cell swelling due to water uptake
B.
Protoplasm shrinking due to water loss
C.
Cell bursting due to water gain
D.
Active transport of molecules across a membrane
Question No. 7
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The reverse of plasmolysis is known as:
A.
Exosmosis
B.
Deplasmolysis
C.
Endosmosis
D.
Turgor pressure
Question No. 8
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Diffusion Pressure Deficit (DPD) is also referred to as:
A.
Osmotic Pressure
B.
Turgor Pressure
C.
Suction Pressure
D.
Wall Pressure
Question No. 9
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The formula for DPD is:
A.
DPD = OP + TP
B.
DPD = OP - TP
C.
DPD = TP - OP
D.
DPD = WP - OP
Question No. 10
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Turgor pressure is defined as:
A.
The pressure exerted by the cell wall on the cell membrane
B.
The pressure exerted by the cell contents on the cell wall
C.
The pressure exerted by the surrounding solution on the cell
D.
The pressure exerted by the cell membrane on the cell contents
Question No. 11
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Wall pressure is:
A.
Equal and opposite to turgor pressure
B.
The pressure exerted by the cell membrane on the cell contents
C.
The pressure exerted by the surrounding solution on the cell
D.
The pressure exerted by the cell contents on the cell wall
Question No. 12
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A hypotonic solution has:
A.
A higher solute concentration than the cell
B.
A lower solute concentration than the cell
C.
The same solute concentration as the cell
D.
No solute concentration
Question No. 13
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An isotonic solution is characterized by:
A.
A higher solute concentration than the cell
B.
A lower solute concentration than the cell
C.
The same solute concentration as the cell
D.
No solute concentration
Question No. 14
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Imbibition is the process of:
A.
Absorption of water by hydrophilic colloids
B.
Loss of water by hydrophilic colloids
C.
Movement of water across a semi-permeable membrane
D.
Active transport of water into a cell
Question No. 15
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Which of these is an example of imbibition?
A.
Swelling of seeds when soaked in water
B.
Plasmolysis of a cell
C.
Osmosis of water into a cell
D.
Diffusion of gases
Question No. 16
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Which of the following describes diffusion most accurately?
A.
Active transport requiring energy
B.
Movement of molecules against a concentration gradient
C.
Movement of molecules from high to low concentration until equilibrium
D.
Movement of water across a semi-permeable membrane
Question No. 17
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What distinguishes osmosis from simple diffusion?
A.
Osmosis requires energy input
B.
Osmosis involves the movement of any type of molecule
C.
Osmosis specifically involves the movement of water across a semi-permeable membrane
D.
Osmosis occurs only in gases
Question No. 18
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A cell placed in a hypotonic solution will:
A.
Shrink
B.
Swell
C.
Remain unchanged
D.
Undergo plasmolysis
Question No. 19
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What happens to a turgid cell when it is placed in a hypertonic solution?
A.
It becomes flaccid
B.
It remains turgid
C.
It bursts
D.
It undergoes deplasmolysis
Question No. 20
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Which of the following is NOT a direct consequence of plasmolysis?
A.
Decrease in turgor pressure
B.
Shrinking of the cytoplasm
C.
Cell death in severe cases
D.
Increased water potential
Question No. 21
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What is the driving force behind water movement during osmosis?
A.
Solute concentration gradient
B.
Temperature gradient
C.
Pressure gradient
D.
pH gradient
Question No. 22
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Which solution has the highest water potential?
A.
A pure water solution
B.
A hypertonic solution
C.
A hypotonic solution
D.
An isotonic solution
Question No. 23
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Imbibition involves the absorption of water by:
A.
Hydrophobic substances
B.
Hydrophilic substances
C.
Semi-permeable membranes
D.
Living cells only
Question No. 24
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Which process is crucial for the opening and closing of stomata in plants?
A.
Diffusion
B.
Osmosis
C.
Imbibition
D.
Active transport
Question No. 25
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Excessive fertilizer application can lead to wilting of plants due to:
A.
Endosmosis
B.
Exosmosis
C.
Imbibition
D.
Active transport
Question No. 26
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Which of the following is NOT a type of solution based on solute concentration?
A.
Hypotonic
B.
Hypertonic
C.
Isotonic
D.
Hyperthermic
Question No. 27
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The swelling of a dry seed when placed in water is primarily due to:
A.
Osmosis
B.
Diffusion
C.
Imbibition
D.
Plasmolysis
Question No. 28
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Which part of the root is primarily responsible for water absorption?
A.
Root cap
B.
Root hairs
C.
Xylem vessels
D.
Root cortex
Question No. 29
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What is the main driving force behind passive water absorption in plants?
A.
Root pressure
B.
Transpiration pull
C.
Active transport
D.
Osmotic pressure
Question No. 30
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Which of the following theories is NOT associated with the ascent of sap?
A.
Cohesion-tension theory
B.
Capillarity theory
C.
Pulsation theory
D.
Root pressure theory
Question No. 31
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What is the primary function of transpiration in plants?
A.
Water uptake
B.
Nutrient transport
C.
Cooling
D.
Photosynthesis
Question No. 32
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Which type of transpiration accounts for the majority of water loss in plants?
A.
Lenticular
B.
Cuticular
C.
Stomatal
D.
Hydathode
Question No. 33
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What controls the opening and closing of stomata?
A.
Light intensity
B.
Turgor pressure
C.
Carbon dioxide concentration
D.
Temperature
Question No. 34
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Which instrument is used to measure the rate of transpiration?
A.
Manometer
B.
Potometer
C.
Hygrometer
D.
Barometer
Question No. 35
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Guttation is the process of water loss in the form of:
A.
Water vapor
B.
Liquid water
C.
Sap
D.
Minerals
Question No. 36
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Which of the following is NOT a characteristic of active water absorption?
A.
Requires metabolic energy
B.
Involves osmotic gradients
C.
Occurs primarily in root hairs
D.
Driven by transpiration pull
Question No. 37
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Where are hydathodes typically located in plants?
A.
Stem apex
B.
Leaf margins
C.
Root tips
D.
Flower petals
Question No. 38
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Which of the following best describes the cohesion-tension theory?
A.
Water is pulled up the xylem due to the cohesive forces between water molecules and the tension created by transpiration.
B.
Water is pushed up the xylem due to root pressure.
C.
Water rises in the xylem due to capillary action.
D.
Water is actively transported up the xylem by specialized cells.
Question No. 39
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What is the role of guard cells in stomatal regulation?
A.
They control the rate of photosynthesis.
B.
They protect the stomata from damage.
C.
They regulate the opening and closing of stomata.
D.
They transport water to the stomata.
Question No. 40
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Which environmental factor has the LEAST direct influence on transpiration rate?
A.
Humidity
B.
Light intensity
C.
Soil type
D.
Wind speed
Question No. 41
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If a plant cell has a lower water potential than its surrounding solution, what will happen?
A.
The cell will lose water to the solution.
B.
The cell will absorb water from the solution.
C.
There will be no net movement of water.
D.
The cell will burst.
Question No. 42
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Which process is primarily responsible for the upward movement of water in tall trees?
A.
Root pressure
B.
Capillary action
C.
Transpiration pull
D.
Guttation
Question No. 43
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Which of the following is NOT a consequence of excessive transpiration?
A.
Wilting
B.
Reduced photosynthesis
C.
Increased nutrient uptake
D.
Decreased growth
Question No. 44
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The Casparian strip in plant roots plays a crucial role in:
A.
Preventing water loss
B.
Selective absorption of minerals
C.
Transporting water to the xylem
D.
Anchoring the plant
Question No. 45
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Which of these processes is NOT directly related to water movement in plants?
A.
Photosynthesis
B.
Transpiration
C.
Root pressure
D.
Guttation
Question No. 46
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What is the primary driving force behind root pressure?
A.
Transpiration
B.
Active transport of ions into root cells
C.
Capillary action
D.
Osmosis
Question No. 47
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Which of the following best describes the role of cohesion in water transport?
A.
It helps water adhere to the xylem walls.
B.
It helps water molecules stick together.
C.
It creates the driving force for transpiration.
D.
It regulates the opening and closing of stomata.
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