NEET Daily Practice Papers - Biology - Plant Water Relation
340 Questions/Answers
Imbibition process involves
Answer:
Explanation:
In the process of osmosis in the cell
Osmotic pressure is highest in
In which part of the plant water is stored
The basis of stomatal opening is
Nishida (1963) explained stomatal opening and closing mechanism in
The rate of transpiration will greatly depends upon
The rate of transpiration will be higher when
Enzyme phosphorylase is first of all discovered in guard cells by
Which is the most important precaution to be observed in finding out the rate of transpiration through Ganong's potometer?
In the resting state of the neutral membrane, diffusion due to concentration gradients, if allowed, would drive
Guttation only occurs in
The potential of water in the vessels of xylem is low. It is due to
The osmotic pressure from 15 to 34 has been reported in
Which of the following trees would die quicker
Diffusion hypothesis most satisfactorily explains
In leaves, water moves
The factor which affects root pressure in the root is
In water–logged soil, plants do not grow properly because
Turgidity in guard cells is controlled by
In trees, death of protoplasts is essential for a vital function such as
Water infiltration will be slowest in
Cell walls of root hairs for absorbing water must be
Which portion of root absorbs both water and minerals
In conifers the water uptake is not much efficient because
The water conducting part of plant is also called
Which is not involved in entry of water through suberized roots
Holding capacity is highest in
Which constitutes an apparent free space
Which tissues are removed when a plant is girdled
The cohesive force of water is due to
Attractive forces of cell walls for water molecules is termed as
Lenticels and hydathodes are small pores with following common attributes
Starch is insoluble in water, yet it is accumulated in large quantities in potato tuber because
Good soil is
Soil formed after leaching and rich in Al and Fe is
Best soil for healthy and vigorous growth of a plant is
The sugarcane plant has
Water of hydration is
Which of the following is importance of water to the plant life
Which of the following water comes under echards?
Why the roots of the plant die in the flooded condition of the soil?
Which light is transmitted by water?
The unique property of water molecules is
Active absorption is affected by
Which of the following is not a function of water in cell
The cells of the plants showing frost hardness have
In terms of permeability, the cell wall and plasmalemma are
That the cell membrane is selectively permeable can be best deduced by
The cell wall is permeable and not a semipermeable structure can be best deduced from the passage of water and mineral salts from
What happens when formalin preserved Spirogyra filament is placed in a hypertonic sugar solution
Selective permeability identifies the process of transmission through semipermeable membrane is called
The process of osmosis involves
Dry seeds when placed in water swells due to
Which of the following shows the presence of semipermeable membrane
If a cleaned goat bladder is filled with a syrup tightly tied and emersed in a vessel of water
A cell placed in strong solution will shrink because
A cell increases in volume if the external medium is
In osmosis solvent flows from
If a cell is reduced in size on placing in a solution of sugar, the solution is
The initial stage of water absorption by root cells is by
Process of osmosis shall cease when
How the molecules of water would behave if pure water is separated from a colloidal suspension with the help of a selectively permeable membrane. It would cause a net movement of water to
Why osmosis cannot be demonstrated by a potato osmoscope using a solution of NaCl instead of sugar; because the potato tissue is
Deplasmolysis occurs in a cell when it is placed in
Grapes immersed in water would shrink if
Why the rapid plasmolysis caused by hypertonic KCl is reversed; because
When pieces of potato tissue were placed in a solution, after some time a loss in weight was recorded. The possible reason could be
In which of the following conditions a slice of fresh beet root should release more betanin pigment
Imbibition is a
A professor kept some moist seeds in an airtight jar and started lecturing. At the end of the experiment an explosion occurred in the jar. What did the professor want to explain
Which of the following demonstrates imbibition
Which of the following seeds will show more imbibitional pressure
Movement of molecules of gases, liquids and solids from a region of higher concentration to a region of lower concentration is termed as
In the process of plasmolysis
In the process of osmosis, volume of solvent
To initiate cell plasmolysis, the salt solution should be
Osmosis is defined as the process in which
Plant cells submerged in distilled water will become
The plants face wilting due to use of excessive fertilizers because of
Dry wooden stakes, if driven into a small crack in a rock and then soaked, can develop enough pressure to split the rock. Such pressure is build up through the phenomenon of
Due to plasmolysis, the plant cell
In rainy season, the doors get wet due to
When a potato piece is kept in a highly concentrated salt solution, then
What would happen if a thin slice of sugar beet is kept in NaCl
A plasmolysed cell can be deplasmolysed by placing it in
If a cell shrinks when placed in a solution, this solution is
What shall be the sequence of events during wilting of a plant
The membrane which allows passage of certain substances more readily than others is termed as
A plant cell attains turgidity due to
When plant cells are kept in a concentrated salt solution, they are
Wilting occurs when
Force developed in cortex of root which pushes water into xylem of root from soil
The osmotic parameter determining flow of water from one cell to another is
If cell A with OP = 5 and TP = 4 is surrounded by cells with OP = 3 and TP = 1, what will be the direction of water movement
DPD is equal to
The actual pressure with which water enters into cell is called
Water potential can be calculated by
When a cell is fully turgid which of the following will be zero
Turgidity of the cells is maintained by
The membrane which allows passage of certain substances more readily than others is termed as
A plant cell attains turgidity due to
When plant cells are kept in a concentrated salt solution, they are
Wilting occurs when
Force developed in cortex of root which pushes water into xylem of root from soil
The osmotic parameter determining flow of water from one cell to another is
If cell A with OP = 5 and TP = 4 is surrounded by cells with OP = 3 and TP = 1, what will be the direction of water movement
DPD is equal to
The actual pressure with which water enters into cell is called
Water potential can be calculated by
When a cell is fully turgid which of the following will be zero
Turgidity of the cells is maintained by
Which of the following is not against concentration gradient
In hypertonic solution a cell water potential
In a fully turgid cell, the values of DPD, OP, and TP will show the tendency
With an increase in the turgidity of a cell, the wall pressure will
In xerophytes, the osmotic concentration of cell sap is
DPD of a cell mainly depends upon
Osmotic concentration of a solution may be governed by
If water enters in a cell, the pressure exerted by its swollen protoplast is
Which of the following is not the type of transpiration?
Generally stomata found on the lower surface of leaf. Thus approximate percentage of transpiration through abaxial surface is
A representative species has stoma of 4 μm wideness and 26 μm length in
In walnut, stomata are found on
In pea plant, type of stomata is known as
Stomata is absent in
Lenticular transpiration takes place in
Difference between apple and mulberry type of stomatal distribution is
Which of the following leaves would dry up last
If the rates of transpiration and water absorption of a flowering plant are measured over a period of twenty four hours, it is found that the rate of transpiration reaches its peak at about mid-day and then declines, whereas the peak for water absorption is reached approximately two hours later. Which one the following statements provides the best explanation of these results?
In Vallisneria, stomata are
By which process atmospheric temperature is maintained?
Which of the following plants do not transpire?
Transpiration efficiency is the ratio of
Path of greater resistance in transpiration is
It rc and rs respectively represents cuticular and stomatal resistances, the total resistance (R) could be expressed as
When strips of chloride papers are placed on either side of a dorsi-ventral leaf, why the strips on the lower side become speedily pink? Because
Unequal loss of water from two surfaces of a dorsi-ventral leaf can be determined by
Which of the following plants economises transpirational loss of water
The trunk of a tree shrinks in day due to
Which of the following would increase the rate of transpiration from the leaves of a potted plant?
Transpiration can be influenced by interfering with
Which of the following factors is the most important in the regulation of transpiration?
When the relative humidity of atmosphere is 100% in day time, the stomata shall
In which of the following situation the stomatal transpiration exhibits a steep decline?
Which of the following exhibits a direct proportionality to transpiration?
In summer months, the rate of transpiration is lowest at
In the terrestrial habitat which of the following factors affect temperature and rainfall conditions?
A well watered herbaceous plant exhibits a decrease in rate of transpiration in intense light; this is due to
In which of the following situations the transpiration would be little affected by change in humidity or temperature?
Under what conditions the rate of transpiration increases by
Transpiration increase with increase in
Stomata in angiosperms open and close due to
Stomata open because of
The transpiration is regulated by the movements of
Which of the following is theory of stomatal opening and closing given by Lewitt?
A metal ion involved in stomatal regulation is
Which of the following theories is not related to the opening of stomata?
Guard cell movement furnishes an example of
Stomata closed and open due to activity of water then movement is known as
Guttation occurs in
Process of water exudation through hydathodes is called
Which one is not related to transpiration
Water is lost as liquid from plant body in
Which of the following is more during the night
Which of the following is responsible for passive guttation
Hydathodes are also called
Loss of liquid water by guttation occurs through
Hydathodes perform the function of
Ultrafiltration theory for permeability of cell membrane was put forth by
Pressure bomb technique was used by
Who proposed the retension pressure theory for the permeability of the membrane
Who proposed the theory of photosynthesis in guard cells
Who explained the scotoactive opening of stomata
Theory of starch–glucose interconversion was proposed by
For photoactive opening of stomata, the proton transport concept was given by
How the change in pH occurs in guard cells was explained and proposed the theory of starch ⇌ sugar interconversion by
The scientist, who proposed that production of glycolic acid in guard cells is an important factor in stomatal opening, is
‘Guttation’ word is given by
Principle of working of all potometers is
Purple cabbage leaves do not lose their colour in cold water but do so in boiling water because
If a potted plant is surrounded by overdose of urea around it, what will happen
When a plant cell is placed in a solution which is hypotonic to the cell sap, which of the following conditions will not apply
0.5 M sucrose solution develops a pressure of 15 bars in an osmometer. Which of the following statement is wrong for such a solution
Sugar is converted into starch when
In which of the following plants would metabolism be hindered if the leaves are coated with wax on their upper surface
Amount of transpire water in beech tree in summer is
More water is lost from
Concentration of CO2 from nature which is able to induce closure of stomata is
Root pressure is maximum when
Guttation is found in
Stomata opens in the night at alkaline or neutral pH (in the atmosphere of ammonia vapours). This statement was given by
What happens if a planted potometer is kept under fan or bright light. The bubble of potometer would
On keeping a freshly cut leafy twig in fuschin solution reveals
In sieve tubes, maximum hydrostatic pressure is found to be
The removal of a ring of bark from trunk of a tree eventually kills it, since
Where does transpiration cohesion pull theory work
The speed of water absorption will be greater if
The overutilization of fertilizers causes death in plants as the fertilizer
Root pressure exceeds over transpiration pull during
In which of the following situations would the transpiration be little affected by change in humidity or temperature?
Under what conditions does the rate of transpiration increase?
Transpiration increases with increase in
Stomata in angiosperms open and close due to
Stomata open because of
The transpiration is regulated by the movements of
Which of the following is theory of stomatal opening and closing given by Lewitt?
A metal ion involved in stomatal regulation is
The metal ion involved in stomatal regulation is or Stomata will open, if there is accumulation of the following element in the guard cells
Conversion of starch to organic acid is essential for
Clarification of mechanism of opening and closing of guard cells is based on which of the following theory
Stomata open during day time because the guard cells
In succulent plants the stomata open in night and close in day. Which among the following would be best hypothesis to explain the mechanism of stomatal action in night only
Which of the following is most likely cause for wider opening of stomata
When an oak leaf stoma is open more widely, the most likely process involved is
Which of the following theories is not related to the opening of stomata
Guard cell movement furnishes an example of
Stomata closed and open due to activity of water then movement is known as
According to proton transport theory, which plays an important role
Which one of the following describes a possible reason for the opening and closing of the guard cells
Which plant part shows upward flow in more quantity?
Food is transported to various parts of the plant through
Organic substances such as sugars are translocated in phloem can be demonstrated by
Translocation of sugar in flowering plants occurs in the form of
Much of the starch is deposited in banana fruit as it matures. Which of the following explains how the starch gets there?
Starch is insoluble in water yet it is accumulated in large quantities in potato because
The carbohydrates synthesized in the leaves are transported through sieve tubes most commonly in the form of
When a plant is girdled
During transport of sugar or amino acid through cell membrane
Which is correct about transport or conduction of substances
Leaf photosynthates are transported to other parts of higher plants through
Munch’s mass flow hypothesis explains
In phloem flow is always from
During translocation the carbohydrates are relatively richer in
The absorption of food in phloem is
What is the substrate for flooting of food in the plants
The prevalent view for the translocation of organic solute in plants is
“Cytoplasmic streaming hypothesis” is concerned with
In which form the food is translocated from endosperm to plumule of a fatty seed like castor
The direction of the conduction of food through phloem is
The flow of organic solutes in plants is in ____ direction.
According to Munch theory, the cause of flow of soluble substances is ____.
By cutting the ring of phloem which of the following process is affected?
Bidirectional translocation of minerals takes place in ____.
The part through which sugars flow from one cell to another are called ____.
Who supported the cytoplasmic flow?
The cytoplasmic flow is called ____.
The cytoplasm of surrounding cells remain connected through each other by plasmodesmata. This continuity is called ____.
The theory put forth by Thaine (1964) is of ____.
The modification of transcellular theory is ____.
The hypothesis put forth by Fenson and Williams is ____.
The improvements so proposed in pressure flow are ____.
In which of the sieve tubes, the callus plugs are formed?
Callus compound is a ____.
Which of the following is the main point in disfavour of Munch theory?
Which ions are concerned with sugar transport?
Intensity of light required for translocation of sugar as compared to photosynthesis is ____.
Translocation may be affected by ____.
Which of the following exudes sap when cut?
Aphid stylate sap analysis can be used to know ____.
Which of the following demonstrates imbibition?
Which of the following seeds will show more imbibitional pressure?
Movement of molecules of gases, liquids and solids from a region of higher concentration to a region of lower concentration is termed as?
In the process of plasmolysis:
In the process of osmosis, volume of solvent:
To initiate cell plasmolysis, the salt solution should be:
Osmosis is defined as the process in which:
Plant cells submerged in distilled water will become:
The plants face wilting due to use of excessive fertilizers because of:
Dry wooden stakes, if driven into a small crack in a rock and then soaked, can develop enough pressure to split the rock. Such pressure is build up through the phenomenon of:
Due to plasmolysis, the plant cell:
In rainy season, the doors get wet due to:
When a potato piece is kept in a highly concentrated salt solution, then:
What would happen if a thin slice of sugar beet is kept in NaCl
A plasmolysed cell can be deplasmolysed by placing it in
If a cell shrinks when placed in a solution, this solution is:
What shall be the sequence of events during wilting of a plant
The membrane which allows passage of certain substances more readily than others is termed as:
A plant cell attains turgidity due to:
When plant cells are kept in a concentrated salt solution, they are:
Which is correct about transport or conduction of substances?
Leaf photosynthates are transported to other parts of higher plants through?
Munch’s mass flow hypothesis explains?
In phloem flow is always from?
During translocation the carbohydrates are relatively richer in?
The absorption of food in phloem is?
What is the substrate for floating of food in the plants?
The prevalent view for the translocation of organic solute in plants is?
“Cytoplasmic streaming hypothesis” is concerned with?
In which form the food is translocated from endosperm to plumule of a fatty seed like castor?
The direction of the conduction of food through phloem is?
The chief function of phloem is the conduction of?
The food stored in the ripening fruit is derived from?
In cell transport the difference between permeable transport and bulk transport relates to?
Sinks are related to?
Supply ends in transport of solute are?
The movement of materials through the vascular tissue of plants is called?
By many evidences, it can be known that the downward movement of food takes place through?
Active transport of solute in plants refers to flow of solutes against a concentration gradient and therefore requires input of energy. This energy is derived?
The principal pathways by which water is translocated in angiosperms is?
The cells of the plants showing frost hardness have
In terms of permeability, the cell wall and plasmalemma are
That the cell membrane is selectively permeable can be best deduced by
The cell wall is permeable and not a semipermeable structure can be best deduced from the passage of water and mineral salts from
What happens when formalin preserved Spirogyra filament is placed in a hypertonic sugar solution
Selective permeability identifies the process of transmission through semipermeable membrane is called
The process of osmosis involves
Dry seeds when placed in water swell due to
Which of the following shows the presence of semipermeable membrane
If a cleaned goat bladder is filled with a syrup tightly tied and immersed in a vessel of water
A cell placed in strong solution will shrink because
A cell increases in volume if the external medium is
In osmosis solvent flows from
If a cell is reduced in size on placing in a solution of sugar, the solution is
All the following involve osmosis except
Freshly cut potato slice is put into strong solution of sugar, later its cells found to be
An example of selectively permeable membrane can be best deduced from the passage of water and mineral salts from
An example of selectively permeable membrane is
Plasma membrane controls
A cell is plasmolysed after being kept in a hypertonic solution. What will be present between cell wall and plasmalemma
What is the chief function of phloem?
The food stored in the ripening fruit is derived from which part?
In cell transport, the difference between permeable transport and bulk transport relates to?
Sinks are related to:
Supply ends in transport of solute are:
The movement of materials through the vascular tissue of plants is called?
By many evidences, it can be known that the downward movement of food takes place through?
Active transport of solute in plants refers to flow of solutes against a concentration gradient and requires energy derived from?
The principal pathways by which water is translocated in angiosperms is?
Purple cabbage leaves do not lose their colour in cold water but do so in boiling water because:
If a potted plant is surrounded by overdose of urea around it, what will happen?
When a plant cell is placed in a solution which is hypotonic to the cell sap, which of the following conditions will not apply?
0.5 M sucrose solution develops a pressure of 15 bars in an osmometer. Which of the following statement is wrong for such a solution?
Sugar is converted into starch when?
In which of the following plants would metabolism be hindered if the leaves are coated with wax on their upper surface?
Amount of transpired water in beech tree in summer is?
More water is lost from?
Concentration of CO2 from nature which is able to induce closure of stomata is?
Root pressure is maximum when?
Guttation is found in?
Publish Year
August 2025
Last Update
August 17, 2025
Language
English
Level
expert
Total Questions
340
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