Potato slices were placed in sucrose solution. After half an hour, density of sucrose solution increased. Water potential of Potato tuber is ... ...[ JIPMER 1999 ]
50%
a) Equal to solute potential of sucrose solution
12%
b) Greater than solute potential of sucrose solution
38%
c) Less than solute potential of sucrose solution
0%
d) Half the concentration of sucrose solution
Q.2.
For keeping stomata open, besides K ions the guard cells require a constant supply of ... ....
14%
a) ABA
57%
b) ATP
29%
c) Organic acids
0%
d) Protons
Q.3.
Transpiration is dependent upon ... ... [ Odsiha 1995]
29%
a) Difference of vapour pressure
14%
b) Degree of stomatal opening
14%
c) Availability of green light
43%
d) Both a and b
Q.4.
Passage of water across a selectively permeable membrane is ... ...
17%
a) Active transport
17%
b) Pinocytosis
0%
c) Facilitated diffusion
67%
d) Osmosis
Q.5.
Root cap has no role in water absorption because ... ..... [ AIIMS 1990]
67%
a) It has no direct connection with the vascular system
17%
b) It has loosely arranged cells
0%
c) It has no cells containing chloroplasts
17%
d) It has no root hairs
Q.6.
Movement of materials against concentration gradient is due to ... .. [ Bih PMT 2004]
50%
a) Active transport
17%
b) Passive transport
33%
c) Diffusion
0%
d) Osmosis
Q.7.
Active K+ exchange mechanism for opening and closing of stomata was given by ... ... [ BHU 1997]
25%
a) Darwin sup
75%
b) Levitt
0%
c) Scarth sup
0%
d) Khorana
Q.8.
Solution A has ψs = -30 bars and ψp = 5 bars. Solution B has ψs = -10 bars and ψp = 0 atm. The two are separated by semipermeable membrane. Flow of water will be ... ...[ KCET 2002]
50%
a) B to A
25%
b) A to B
25%
c) Equal in both directions
0%
d) No flow of water
Q.9.
Cells absorb water through ... ... [ AMU 1999 ]
25%
a) Osmosis only
0%
b) Imbibition only
50%
c) Both osmosis and imbibition
25%
d) None of the above
Q.10.
A wooden peg inserted in a rock causes its breaking during the rainy season. It is due to development of ... ...
33%
a) Turgor pressure
0%
b) Osmotic pressure
33%
c) Matric potential
33%
d) Plasmolysis
Q.11.
Transpiration and root pressure cause water to rise in plants by : …[AIPMT 2015]
50%
a) pushing and pulling it, respectively
25%
b) pulling it upward
25%
c) pulling and pushing it, respectively
0%
d) pushing it upward
Q.12.
Which of the following criteria does not pertain to facilitated transport ? …[NEET 2013]
50%
a) Requirement of special membrane proteins
25%
b) High selectivity
25%
c) Transport saturation
0%
d) Uphill transport
Q.13.
A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap ? …[NEET 2016]
40%
a) Low refractive index
40%
b) Absence of sugar
20%
c) Acidic
0%
d) Alkaline
Q.14.
The water potential of pure water is….[NEET- 2017]
40%
a) Zero
40%
b) Less than zero
20%
c) More than zero but less than one
0%
d) More than one
Q.15.
Root pressure develops due to : [ ReAIPMT 2015]
25%
a) Increase in transpiration
50%
b) Active absorption
25%
c) Low osmotic potential in soil
0%
d) Passive absorption
Q.16.
Roots play insignificant role in absorption of water in : [ ReAIPMT 2015]
50%
a) Wheat
25%
b) Sunflower
25%
c) Pistia
0%
d) Pea
Q.17.
A column of water within xylem vessels of tall trees does not break under its weight because of : [ ReAIPMT 2015]
25%
a) Positive root pressure
0%
b) Dissolved sugars in water
25%
c) Tensile strength of water
50%
d) Lignification of xylem vessels
Q.18.
Which of the following elements is responsible for maintaining turgor in cells ? [NEET 2018]
0%
a) Magnesium
25%
b) Sodium
0%
c) Potassium
75%
d) Calcium
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