Excessive supply of chemical fertilizers often causes wilting/death of crop plants due to ... ....
0%
a) Exosmosis
33%
b) Endosmosis
0%
c) Imbibition
67%
d) Turgidity
Q.2.
Energy source responsible for upward flow of water is .... ...
33%
a) ATP
67%
b) Sucrose
0%
c) Solar heat
0%
d) Light
Q.3.
Transpiration is mainly a process of .... ... [ Odisha 2005]
33%
a) Imbibition
33%
b) Respiration
33%
c) Osmotic pressure
0%
d) Diffusion
Q.4.
Water potential in closely placed cell (p, q, r) is given below. Find out correct direction of water movement a) p → q b) q → r c) r - p d) r - q
Cell
Osmotic Potential (MPa)
Pressure Potential (MPa)
p
-0.21
0.05
q
-0.22
0.02
r
-0.23
0.05
67%
a) a, b
33%
b) b, c
0%
c) a, d
0%
d) b, d
Q.5.
Which one is correct? ... ...[ Manipal 2000 ]
67%
a) ψm = ψp +ψs + ψw
0%
b) ψw = ψp + ψs + ψm
33%
c) ψp = ψw + ψm + ψs
0%
d) ψw = ψw + ψp + ψp + ψs
Q.6.
Whose water potential is less than water potential of root hair during water absorption (by root hair) ... .... [ Guj CET 2011]
67%
a) Gravitational water
0%
b) Pure water
33%
c) Vacuolar sap
0%
d) Soil solution
Q.7.
"Osmosis is flow of solution from higher concentration to solution of lower concentration to solution of lower concentration through semi-permeable membrane". Which is incorrect in the statement? ... ..... [ AFMC 1997]
50%
a) Exact concentration of solution is not given
0%
b) Character of semipermeable membrane is not given
0%
c) Flow of solution is not possible through semipermeable membrane
50%
d) All the above
Q.8.
Enzyme connected with stomatal opening is ... ....
67%
a) Pyruvic kinase
0%
b) Cytochrome oxidase
0%
c) PEP carboxylase
33%
d) RuBISCO
Q.9.
Apoplast is the system of adjacent cell walls that is continuous throughout the plant except at the ... ...[ HPPMT 2010]
100%
a) Plasmodesmata
0%
b) Vessel elements
0%
c) Casparian strips of endodermis
0%
d) Tracheid
Q.10.
What is true? ... ... [ Har PMT 2005]
50%
a) ABA opens stoma
50%
b) ABA opens stomata while cytokinin closes stomata
0%
c) ABA closes while cytokinin opens stomata
0%
d) ABA and cytokinin do not affect stomata
Q.11.
In biological system, the terms osmosis involves the diffusion of ... ..... [ Odisha 2008]
50%
a) Water
0%
b) Solutes
0%
c) Energy
50%
d) Both a and b
Q.12.
Turgor pressure develops in epiblema cells of root due to ... ..[ Tamilnadu 2002]
50%
a) High water potential of cortical cells
50%
b) Entry of water into root hairs and increase in volume of cell sap
0%
c) Filling of large vacuole in root hair with cell sap
0%
d) Osmotic diffusion of water into pericycle through passage cells
Q.13.
A cell kept in a solution increases in volume. The solution is ... ..[ Pb. PMT 2001]
0%
a) Hypotonic
50%
b) Isotonic
0%
c) Hypertonic
50%
d) Either a or b
Q.14.
Osmotic potential and pressure potential of three cells a, b, c located in different parts of an actively transpiring plant are .... [ EAMCET 2009] Which ones are root hair, root cortical and mesophyll cells respectively
Cell
O.P. (MPa)
P.P.(MPa)
a
-0.87
0.44
b
-0.92
0.34
c
-0.68
0.27
50%
a) a, b, c
50%
b) a, c, b
0%
c) c, a, b
0%
d) b, c, a
Q.15.
Osmotic potential is depicted as ... ... [ RPMT 1998]
50%
a) (-)
50%
b) (+)
0%
c) X
0%
d) (+)
Q.16.
Phloem sap is mainly made of ... ... [ AMU 2012]
100%
a) Water, minerals and sucrose
0%
b) Water and minerals
0%
c) Oligosaccharides and hormones
0%
d) None of the above
Q.17.
Stomata generally open during the day because the guard cells have ... ... [ MPPMT 1993]
50%
a) Outer thin wall
50%
b) Chlorophyll
0%
c) Kidney-shape
0%
d) Larger nuclei
Q.18.
Who is related to ascent of sap ... ... [ CET Chd. 2006]
100%
a) McClung
0%
b) J.C. Bose
0%
c) A. Fleming
0%
d) J. Lederberg
Q.19.
Transpiration is high in ... ...[ MPPMT 1993]
100%
a) Rainy season/high humidity
0%
b) winter
0%
c) High temperature
0%
d) Low wind velocity
Q.20.
A cell when dipped in 0.5M sucrose solution has no effect but when the same cell is dipped in 0.5 M NaCl solution, it will ... .... [ AFMC 2005]
50%
a) Increase in size
0%
b) Decrease in size
0%
c) Becomes turgid
50%
d) Gets plasmolysed
Q.21.
When a cell is fully turgid, which of the following will be zero ... .... [ BHU 1991]
50%
a) Turgor pressure/pressure potential
0%
b) Wall pressure
0%
c) Suction pressure/DPD/water potential
50%
d) Osmotic pressure ( solute pressure)
Q.22.
Amount by which water potential is reduced due to presence of solute is called .... ...[ AMU 2002]
100%
a) Pressure potential
0%
b) Solute potential
0%
c) Matric potential
0%
d) None of the above
Q.23.
In root hair, water enters due to .... .... [ RPMT 2000 ]
100%
a) Diffusion
0%
b) W.P.
0%
c) T.P.
0%
d) O.P.
Q.24.
Ionic flux of guard cells directly connected with expenditure of energy is ... ...[ EAMCET 2008]
50%
a) Outward movement of protons
0%
b) Outward movement of malate
50%
c) Inward movement of K+
0%
d) Inward movement of Cl
Q.25.
Root pressure is maximum at the time of ... ... [ JIPMER 2002]
50%
a) Water absorption as well as transpiration are low
50%
b) Both water absorption and transpiration are high
0%
c) Absorption is low and transpiration is high
0%
d) Absorption is high and transpiration is low
Q.26.
Water absorbed by root in order to meet the requirement of transpiration is due to ... ...[ JIPMER 2003]
100%
a) Transpiration pull
0%
b) Osmosis
0%
c) Imbibition
0%
d) Plasmolysis
Q.27.
The relation πν = nRT is not obeyed by ... .... [ W.B. 2012]
0%
a) Concentrated solution
50%
b) Dilute solution
0%
c) Extremely dilute solution
50%
d) All the above
Q.28.
The term water potential was coined by ... ..
50%
a) Sayre
0%
b) Von Mohl
0%
c) Lloyed
50%
d) Slatyer and Taylor
Q.29.
Assertion: In angiosperms, the conduction of water is more efficient because their xylem has vessels Reason: Conduction of water by vessel elements is an active process with energy supplied by xylem parenchyma rich in mitochondria .... ..[ AIIMS 2006]
50%
a) If both the assertion and reason are true and reason explains the assertion
50%
b) If both the assertion and reason are true but reason does not explain the assertion.
0%
c) If assertion is true but reason is false
0%
d) If both are wrong
Q.30.
Root hairs occur in the zone of ... ... [ kerala 2003]
50%
a) Cell division
50%
b) Cell elongation
0%
c) Cell maturation
0%
d) Mature cells
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