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Quiz 8
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Q.1
Risk of spoilage is less in salted pickles as it causes ... ...[ EAMCET 2002]
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a) Guttation
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b) Imbibition
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c) Diffusion
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d) Plasmolysis
Explanation
Plasmolysis occurs in fungi and bacteria when they are kept in hypertonic solutions such as salt solution, sugar solution etc. Answer : (d)
Q.2
Which one is most efficient imbibant? ... ...[ KCET 2008]
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a) Pectin
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b) Agar
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c) Cellulose
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d) Lignin
Explanation
Imbibants are the solid substance or adsorbent which take part in imbibition and the liquid that is imbibed is known as imbibate. Agar, a mixture of cell-wall polysaccharides including agarose and had a large number of hydroxyl groups causes adsorption of water compaired to any of the given option Answer : (b)
Q.3
In cell wall of guard cells, cellulose microfibrils are arranged ... .... [ AMU 2009]
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a) Transversely
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b) Tangentially
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c) Radially
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d) Obliquely
Explanation
Guard cells are another specialized cell type that have an unusual but very characteristic cell wall morphology. The cellulose microfibrils are arranged radially around the cell, and this arrangement, known as radial micellation, is important for proper stomatal function. Answer : (c)
Q.4
Prolonged water-logging kills plants due to .... ....[ CBSE 1997]
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a) Stoppage of root respiration
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b) Dilution of soil nutrients
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c) Dilution of plant cells sap
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d) Leaching of nutrients
Explanation
Waterlogging is the saturation of soil with water which excludes air from the groundwater. If waterlogging will be prolonged then air cannot reach up to groundwater and root and it will result in the stoppage of root respiration. So, the correct answer is 'Stoppage of root respiration'. Answer : (a)
Q.5
Assertion: Water entering a plant cell makes it turgid Reason: Entry of water into cell develops wall pressure inside the cell .... ..[ AIIMS 2011]
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
Cells turgidity is due to turgor pressure. Turgor pressure is the pressure which develops in the confined part of an osmotic system due to osmotic entry of water into it. It is also called hydrostatic pressure or pressure potential. The force exerted by the cell wall over the protoplast is called wall pressure. Reason statement is not correct Normally wall pressure is equal and opposite to turgor pressure except when the cell becomes flaccid. Answer : (c)
Q.6
Diffusion of water through selectively permeable membrane is ... .... [ CPMT 1993]
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a) Diffusion
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b) Imbibition
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c) Osmosis
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d) Translocation
Explanation
Diffusion of water through selectively permeable membrane is Osmosis Answer : (c)
Q.7
Passive water absorption by root system is due to .... .... [ KCET 2006]
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a) Forces created in the cells of the root
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b) Osmotic force in the shoot system
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c) Increased respiratory activity in cells of the root
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d) Tension in the sap due to transpiration
Explanation
When transpiration is high, xylem sap is usually under tension, rather than under pressure, due to transpirational pull. Water then diffuses from the soil into the root xylem due to osmosis. Root pressure is caused by this accumulation of water in the xylem pushing on the rigid cells. Answer : (d)
Q.8
In fully turgid cell ... ...
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a) ψs is negative and ψp is positive
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b) ψp is negative and ψs is positive
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c) Both ψp and ψs are positive
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d) Both ψs and ψp are negative
Explanation
Water potential of full turgid cells is zero. Fully turgid cell has the highest water potential . As water enters the cell the water apllies pressure against the walls of the cell. In the case of a fully turgid cell, no more water can enter the cell, thus it has the highest water potential. The pressure potential becomes equal to the solute potential in magnitude. The solute potential is negative and the pressure potential is postive. Answer : (a)
Q.9
In tall trees water is absorbed due to ... ..... [ Guj CET 2011]
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a) Transpiration/suction pull
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b) Root pressure
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c) Capillary action
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d) Photosynthesis
Explanation
In tall trees water is absorbed due to Transpiration/suction pull Answer : (a)
Q.10
When beet root cylinders are washed and then palced in cold water, anthocyanin does not come out. This indicates that most likely the plasma membrane is .... .... [ AFMC 1990]
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a) Permeable to anthocyanin
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b) Impermeable to anthocyanin
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c) Differentially permeable to anthocyanin
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d) Dead structure
Explanation
Anthocyanin pigment cannot come out side due to impermeability of plasma membrane.Read more on Sarthaks.com - https://www.sarthaks.com/322755/when-beet-root-cylinders-are-washed-and-then-placed-cold-water-anthocyanin-does-not-come-out Answer : (b)
Q.11
Rate of transpiration higher than rate of water absorption shall cause ... ... [ JIPMER 2003 ]
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a) Growth
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b) Guttation
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c) LEaf fall
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d) Wilting
Explanation
Wilting occurs when the rate of loss of water from the plant is greater than the absorption of water in the plant. Answer : (d)
Q.12
Arrange root hair cell, inner cortical cell and mesophyll cell in ascending order of DPD ... ...[ JIPMER 2000 ]
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a) Mesophyll cell, Root hair cell and Cortical cell
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b) Cortical cell, Mesophyll cell and Root hair cell
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c) Root hair cell, Cortical cell and Mesophyll cell
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d) Root hair cell, Mesophyll cell and Cortical cell
Explanation
Water flows from a region of lower DPD diffusion pressure deficit to higher DPD. When roots absorb water it moves from root hair cells to the root cortex cells. Answer : (c)
Q.13
Colligative property is Osmotic pressureVapour pressure loweringCohesive force Surface tension .... ..[ BHU 2008]
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a) 1, 2, 3
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b) 1, 2
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c) 2, 4
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d) 1, 3
Explanation
The four colligative properties are vapor pressure lowering, freezing point depression, boiling point elevation, and osmotic pressure Answer : (b)
Q.14
Root hair absorbs water from soil though ... ..[ BHU 2006]
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a) Turgor pressure
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b) exchange
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c) Osmosis
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d) DPD
Explanation
Plants absorb water and minerals salt from the soil with the help of root hairs. They absorb water by the process of osmosis Answer : (c)
Q.15
Movement of water from higher water potential to lower water potential through a semipermeable membrane is called ... ..... [ JKCMEE 2010]
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a) Osmosis
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b) Diffusion
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c) Plasmolysis
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d) Imbibition
Explanation
Movement of water from higher water potential to lower water potential through a semipermeable membrane is called Osmosis Answer : (a)
Q.16
Plasmolysis is due to ... ... [ CPMT 1995]
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a) Exosmosis
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b) Endosmosis
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c) Osmosis
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d) Adsorption
Explanation
Plasmolysis is contraction of the protoplast of a plant cell as a result of loss of water from the cell. Exosmosis is the passage of a fluid through a semipermeable membrane toward a solution of lower concentration, especially the passage of water through a cell membrane into the surrounding medium Answer : (a)
Q.17
Oozing out of water drops from injured edges or tips is ... ...[ Odisha 2006]
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a) Bleeding
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b) Guttation
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c) Transpiration
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d) Oozation
Explanation
Oozing out of water drops from injured edges or tips in plants is called bleeding Answer : (a)
Q.18
In hot summer day, plant cooling occurs due to ... .... [ BHU 1991 ]
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a) Transport of water from root to all parts of the plant
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b) Loss of liquid water
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c) Water loss from entire plant
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d) Loss of water vapours from foliar surface
Explanation
Answer : (d)
Q.19
The following percentage of water absorbed by herbaceous plants is lost in transpiration ... .... [ JIPMER 2002]
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a) 80
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b) 60
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c) 99
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d) 40
Explanation
Studies show that 9999% of the absorbed water is evaporated and the minute amount of water is used by the plants. Answer : (c)
Q.20
Match the columns and find the correct combination ,,, ,,,[ kerala 2005]
a) Hypotonic
i) Water
b) Hypertonic
ii) Sucrose
c) Solute
iii) Lower tonicity
d) Solvent
iv) Higher tonicity
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a) a - i, b - ii, c - iii, d - iv
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b) a - iii, b - ii, c - i, d - iii
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c) a - iii, b - ii, c - iii, d - i
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d) a - iii, b - iv, c - ii, d - i
Explanation
tonicity is the relative concentration of solutes dissolved in solution which determine the direction and extent of diffusion. If the extracellular fluid has lower concentration of solutes than the fluid inside the cell, it's said to be hypotonic—hypo means less. a - iii Hypertonic have Higher tonicity b - iv Sucrose is solute when dissoled in waterSolute c - ii, d - i Answer : (d)
Q.21
When concentration of solutes is low in the soil, absorption of water is ... .....[ KCET 2007]
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a) Stopped
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b) Increased
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c) Retarded
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d) Normal
Explanation
When concentration of solutes is low in the soil, absorption of water is will increases by the process of osmosis, Water flow from Hypotonic (lower concentration of solute) to Hypertonic solution ( More concentration of solute) Answer : (b)
Q.22
Cell a and cell b are adjacent plant cells. In cell a ψs = -20 bars and ψp = 8 bars. In cell b ψs = -12 bars and ψp = 2 bars. Then ... ...[ KCET 2010]
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a) Water moves from cell a to cell b
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b) There is no movement of water between cell a and cell b
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c) Water moves from cell b to cell a
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d) Equal amount of water is simultaneously exchanged between cell a and cell b
Explanation
Water always moves from the system with a higher water potential to the system with a lower water potential. Solute potential (ψs) decreases with increasing solute concentration; a decrease in Ψs causes a decrease in the total water potential. For cell A = -20 +8 = -12 For cell B = -12 +2 = -10 Water pressure of cell B is more than Cell A , therefore water flows from B to A Answer : (c)
Q.23
Root pressure helps in ascent of sap by ... ..... [ Bihar PMT 2000 ]
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a) Pumping food in phloem
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b) Pumping sap into xylem in roots
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c) Pumping sap in stem for sending in to roots
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d) All the above
Explanation
Root pressure, in plants, force that helps to drive fluids upward into the water-conducting vessels (xylem). Answer : (b)
Q.24
An RBC and a plant cell having same O.P. are placed in distilled water ... ..[ KCET 2009]
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a) None undergoes any change
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b) Plant cell swells up and bursts but there is no change in RBC
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c) RBC swells up and bursts plant cell remains about the same size
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d) Both decrease in size and collapse
Explanation
When RBC and a plant cell are placed in distilled water, endosmosis takes place in RBC as a result of which RBC would increase in size and burst, while the plant cell would remain about the same size because endosmosis is stopped due to the presence of rigid cell wall. Answer : (c)
Q.25
Cohesion theory of ascent of sap was proposed by .... .... [ AFMC 1993]
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a) Munch
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b) Stephen Hales
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c) Dixon and Joly
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d) Bose
Explanation
Cohesion Tension Theory (Cohesion-Tension and Transpiration Pull Theory): The theory was put forward by Dixon and Joly in 1894. It was further improved by Dixon in 1914. Therefore, the theory is also named after him as Dixon's theory of ascent of sap Answer : (c)
Q.26
Guttation differs from transpiration in ... ... [ HPPMT 2012]
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a) Control by stomata
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b) Occurrence during daytime
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c) Occurrence in vapour form
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d) Occurrence in liquid form
Explanation
Difference between Transpiration and Guttation. Transpiration occurs primarily through stomata and also through lenticels. Guttation occurs only through Hydathodes. In transpiration, water is lost in the form of water vapours Answer : (d)
Q.27
During absorption of water by roots, the water potential of cell sap is lower than that of ... ...[ BHU 1994]
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a) Pure water and soil solution
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b) Neither pure water nor soil solution
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c) Pure water but higher than that of soil solution
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d) Soil solution but higher than that of pure water
Explanation
During absorption of water by roots, the water potential of cell sap is lower than that of Pure water and soil solution Answer : (a)
Q.28
Plasmolysis occurs when cells are kept in ... ...[ HPPPMT 2010]
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a) Hypotonic solution
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b) Hypertonic solution
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c) Isotonic solution
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d) None of the above
Explanation
Plasmolysis occurs when cells are kept in, this occurs when the cell is kept in a solution that is hypertonic (has more solutes) to the protoplasm. Answer : (b)
Q.29
Wilting in plants occurs when .... .... [ AFMC 2005 ]
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a) Phloem is blocked
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b) Xylem is removed/blocked
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c) Pith is removed
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d) A few leaves are removed
Explanation
Wilting in plants occurs when Xylem is removed/blocked Answer : (b)
Q.30
Potometer works on the principle of ... ... [ CBSE 2005]
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a) Osmotic pressure
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b) Amount of water absorbed equals the amount transpired
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c) Root pressure
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d) Potential difference between tip of tube and that of plant
Explanation
Potometer works on the principle of amount of water absorbed equals the amount of water transpired Answer : (b)
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