MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
NEET
NEET Biology MCQ
Neet Botany Transport In Plants Mcq
Quiz 7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Q.1
Guard cells regulate ... .... [ AFMC 2012]
0%
a) Respiration
0%
b) Transpiration
0%
c) Photosynthesis
0%
d) Photorespiration
Explanation
Guard cells regulate Transpiration Answer : (b)
Q.2
Water ascends in plants through ... ... [ AFMC 1993]
0%
a) Xylem
0%
b) Phloem
0%
c) Stele
0%
d) Pith
Explanation
The cohesion-tension theory explains how water moves up through the xylem Answer : (a)
Q.3
The space between plasma membrane and cell wall of a plasmolysed cell surrounded by hypertonic solution is occupied by .... ...[ KCET 2011]
0%
a) Isotonic solution
0%
b) Hypotonic solution
0%
c) Hypertonic solution
0%
d) Water
Explanation
When a plant cell is placed in a hypertonic solution it will lose water by exosmosis. This process is called plasmolysis. The protoplasm will shrink and will move inwards and away from the cell wall. As a result, the hypertonic solution will occupy the space between the plasma membrane and the cell wall. Answer : (c)
Q.4
According to the vital force theory, ascent of sap is due to active pulsation of innermost layer of cortex. This theory was given by ... ...[ Bih PMT 2002]
0%
a) J.C. Bose
0%
b) Dixon
0%
c) Strasburger
0%
d) Sachs
Explanation
According to the vital force theory, ascent of sap is due to active pulsation of the innermost layer of cortex. This theory was given by J.C Bose. Answer : (a)
Q.5
Water is lost through hydathodes. Hydathodes .... .... [ KCET 2006]
0%
a) Remain closed at night
0%
b) Remain closed during day
0%
c) Remain always open
0%
d) Remain open during day
Explanation
Hydathodes are always associated with the vein ends of leaves. Stomata remain closed at night and opened in the day time. Hydathodes always remain open (both day and night). The opening and closing of stomata can be regulated by guard cells. Answer : (c)
Q.6
Water drops present on leaf margins of Tropaeolum, balsam and grasses in early morning are due to ... ...[ AIIMS 1998]
0%
a) Guttation
0%
b) Dew
0%
c) Osmosis
0%
d) Transpiration
Explanation
Guttation is the exudation of drops of xylem sap on the tips or edges of leaves of some vascular plants, such as grasses, and a number of fungi. Answer : (a)
Q.7
Wilting occurs when there is ... .[ AFMC 2004]
0%
a) Transpiration higher than absorption
0%
b) Absorption higher than transpiration
0%
c) Higher relative humidity of atmosphere
0%
d) Excess root pressure
Explanation
Wilting is the loss of rigidity of non-woody parts of plants. This occurs when the turgor pressure in non-lignified plant cells falls towards zero, as a result of diminished water in the cells. The rate of loss of water from the plant is greater than the absorption of water in the plant. Answer : (a)
Q.8
Cobalt chloride method for demonstration of transpiration was first used by .... ...
0%
a) Freeman
0%
b) Stahl
0%
c) Daerin
0%
d) Ganong
Explanation
Answer : (b)
Q.9
Swelling of wooden frames during rains is caused by ... ...[ CPMT 1997]
0%
a) Endosmosis
0%
b) Imbibition
0%
c) Capillarity
0%
d) Osmosis
Explanation
Imbibition is the physical adsorption of water or moisture. A common example is swelling of wooden furniture, doors, windows and frames of doors and windows, because of adsorption of moisture due to imbibition. Answer : (b)
Q.10
Choose the correct sequence of events during wilting ... .... [ kerala 2002]
0%
a) Exosmosis, deplasmolyis, temporary wilting, permanent wilting
0%
b) Exosmosis, plasmolysis, temporary wilting, permanent wilting
0%
c) Endosmosis, plasmolysis, temporary wilting, permanent wilting
0%
d) Exosmosis, deplasmolysis, plasmolysis, temporary wilting,permanent wilting
Explanation
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. plasmolysis contraction of the protoplast of a plant cell as a result of loss of water from the cell. Temporary wilting is a condition when the amount of water lost from the plant during transpiration is greater the amount of water absorbed from the soil. Wilting is the loss of rigidity of non-woody parts of plants. This occurs when the turgor pressure in non-lignified plant cells falls towards zero, as a result of diminished water in the cells. Answer : (b)
Q.11
Shrinking of protoplasm from cell wall under influence of hypertonic solution is ... ...[ kerala 2001]
0%
a) Plasmolysis
0%
b) Apoptosis
0%
c) Deplasmolysis
0%
d) Flaccidity
Explanation
Shrinkage of the protoplast of a cell from its cell wall under the influence of a hypertonic solution is called plasmolysis. Answer : (a)
Q.12
transpiration-cohesion tension theory operates in .... ....
0%
a) Active absorption
0%
b) Passive absorption
0%
c) Active and passive absorption
0%
d) Apoplastic movements
Explanation
the ascent of sap in plants is a passive physical process, which occurs under the influence of transpiration pull generated due to loss of water from aerial parts Answer : (b)
Q.13
The principle by which blotting paper absorbs water is ... ....[ BHU 1996]
0%
a) Capillary action
0%
b) Transpiration pull
0%
c) Root pressure
0%
d) Absorptive capacity
Explanation
The principle by which blotting paper absorbs water is Capillary action The capillary action is based on the property of surface tension of liquid. Answer : (a)
Q.14
Ability to rise in thin tubes and ability to resist pulling force are respectively ... .... [ kerala 2012]
0%
a) Tensile strength and capillarity
0%
b) Cohesion and adhesion
0%
c) Capillarity and tensile strength
0%
d) Adhesion and capillarity
Explanation
Capillarity is the tendency of a liquid in a capillary tube or absorbent material to rise or fall as a result of surface tension. Tensile strength is defined as the ability of a material to resist a force that tends to pull it apart. Answer : (c)
Q.15
Root pressure is maximum when ... .. [ MHTCET 2008]
0%
a) Transpiration is high and absorption low
0%
b) Transpiration is very low and absorption high
0%
c) Transpiration is very high and absorption high
0%
d) Transpiration and absorption both are slow
Explanation
Transpiration is the output of water from a plant, and absorption is the input of water into a plant. If output is low and input is high, pressure will be at its greatest. Root pressure is osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves. Transpiration pull is the force which aids in drawing the water upward from roots to leaves. Thus if transpiration is high water will be lost resulting in lowering of root pressure Answer : (b)
Q.16
Match the columns ... .... [ manipur 2006]
a) Diffusion
Hydrophilic substances
b) Osmosis
Shrinkage of protoplasm
c) Imbibition
Semipermeable membrane
d) Plasmolysis
Free movement of ions and gases
0%
a) a - 2, b - 1, c - 4, d - 3
0%
b) a - 3, b - 1, c - 4, d - 2
0%
c) a - 2, b - 3, c - 4, d - 1
0%
d) a - 4, b - 3, c - 1, d - 2
Explanation
Diffusion is Free movement of ions and gases from an area of high concentration to an area of low concentration. a - 4 Osmosis a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one. b - 3 The process of imbibition occurs mainly due to the presence of hydrophilic or lyophilic colloids. Water is imbibed through the sub microscopic capillaries present on the surface of the body. Substances such as cellulose and starch are hydrophilic and are imbibants c - 1 Plasmolysis is the process of water leaving plant cells, allowing the cytoplasm and plasma membrane to shrink away from the cell wall. d - 2 Answer : (d)
Q.17
At constant temperature, the rate of transpiration will be higher at ... .... [ CBSE 1992 ]
0%
a) Sea level
0%
b) 1 km below sea level
0%
c) 1 km above sea level
0%
d) 1.5 km above sea level
Explanation
At constant temperature, the rate of transpiration will be higher at 1.5 km above the sea level. At lower atmospheric pressure there is increase in the rate of evaporation Answer : (d)
Q.18
Identify the correct statements and find out the correct combination? ... ..[ EAMCET 2005]Accumulation of K+ ions in guard cells does not require energyA high pH favors stromal openingMovement of chloride ions into guard cells is in response to electrical differential created by K+ ionsWith entry of several K+ ions and chloride ions, water potential of guard cells increases
0%
a) 1 and 3
0%
b) 1 and 2
0%
c) 2 and 3
0%
d) 3 and 4
Explanation
Statement 1 is not correct as :When plants are exposed to light the guard cells accumulate large amounts of K⁺. Light stimulate the active movement of K⁺ ions from surrounding cells into the vacuoles of the guard cells. statement 2 is correct as Generally a high pH favors opening and a low pH favors closing of the stomata. Statement 3 is correct as the K⁺ ions migrate, they are accompanied by Cl⁻; the anion apparently moves in response to electric difference created by the K⁺ uptake into the guard cells. Statement 4 is not correct as in guard cells, osmotic and hence water potentials become very negative due to the presence of K⁺ Cl⁻ potassium malate or dipotassium malate or both. Answer : (c)
Q.19
Osmosis involves ... ... [ JIPMER 1998]
0%
a) Diffusion of suspended particles from higher to lower concentration
0%
b) Diffusion of suspended particles from lower to higher concentration
0%
c) Diffusion of water from more to less concentrated side
0%
d) Diffusion of water from less to more concentrated side
Explanation
Osmosis involves Diffusion of water from less to more concentrated side Answer : (d)
Q.20
A cell with DPD=5 is surrounded by A, B, C and D cells having O.P. and T.P. respectively 5 and 4, 7 and 5, 3 and 2, and zero and zero. From which cell it will withdraw water faster .... .....[ Har PMT 2003]
0%
a) D
0%
b) C
0%
c) B
0%
d) A
Explanation
We know that water flows from lower DPD to higher DPD DPD= OP - TP Cell A DPD= 5 -4 = 1 Cell B DPD = 7 - 5 = 2 Cell C DPD = 3-2 = 1 Cell D DPD = 0 -0 =0 Since Cell D have lowest DPD water will flow maximum from cell D Answer : (a)
Q.21
A cell placed in hypotonic solution will ... ....[ Odisha 2000 ]
0%
a) Shrink
0%
b) Show exosmosis
0%
c) Show endosmosis
0%
d) No change in shape or size
Explanation
hypotonic solution ( hypo = low concentration of solute) water will eneter in cell or show endosmosis Answer : (c)
Q.22
According to Steward's starch hydrolysis theory which one of the following is principal reason for opening of stomata during daytime .... ....[ KCET 2010]
0%
a) Influx of K+ ions into guard cells under influence of ABA hormone
0%
b) Conversion of sugar into starch in guard cells
0%
c) Efflux of K+ ions from guard cells under the influence of ABA hormone
0%
d) Photosynthetic utilization of CO2 in guard cells
Explanation
According to Steward's starch hydrolysis theory steps are as follows Photosynthesis (1) ↓Decreased CO2Concentration in leaf cells (2) ↓Increase in pH of guard cells(3) ↓ Hydrolysis of starch to sugar by enzymes (4) ↓ Increase of O.P. of guard cells(5) ↓ Endosmosis of water in guard cells (6) →Increase in T.R of guard cells (7) ↓Aperture opens Answer : (d)
Q.23
Water potential and osmotic potential of pure water are ... ...[ CBSE 1998]
0%
a) Zero and zero
0%
b) 100 and zero
0%
c) 100 and 100
0%
d) Zero and 100
Explanation
Pure water at atmospheric pressure has a solute potential of zero. As solute is added, the value for solute potential becomes more negative. solute potential: (osmotic potential) pressure which needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane. Hence zero for pure water Answer : (a)
Q.24
Tracheid are less efficient than vessels due to ... ... [ MHTCET 2011]
0%
a) Absence of closed end walls
0%
b) Uneven thickenings
0%
c) Casparian strips
0%
d) Presence of tapering end walls
Explanation
Tracheid are less efficient than vessels due to Presence of tapering end walls Answer : (d)
Q.25
Cohesion-tension theory is related to .... ...[ CPMT 2001]
0%
a) Respiration
0%
b) Ascent of sap
0%
c) Transpiration
0%
d) Photosynthesis
Explanation
Cohesion-tension theory is related to Ascent of sap Answer : (b)
Q.26
A higher plant cell covered with cutin and suberin is placed in water. After 15 minutes, the cell ... ...[ BHU 1993]
0%
a) Will be killed
0%
b) Size will increase
0%
c) Size will remain unchanged
0%
d) Size will decrease
Explanation
Suberin, cutin and lignins are complex, higher plant epidermis and periderm cell-wall macromolecules, forming a protective barrier. Its main function is as a barrier to movement of water and solutes Water can not enter the cells Answer : (c)
Q.27
Rate of transpiration will increase if ... .... [ HPPMT 2007]
0%
a) RH increases
0%
b) RH decreases
0%
c) RH remains unchanged
0%
d) Water potential gradient remains unchanged
Explanation
Relative humidity – Relative humidity (RH) is the amount of water vapor in the air compared to the amount of water vapor that air could hold at a given temperature. Thus decrease in RH will increase rate of transpiration Answer : (b)
Q.28
Wilting appears due to excessive ... ... [ AFMC 2001]
0%
a) Respiration
0%
b) Photosynthesis
0%
c) Absorption
0%
d) Transpiration
Explanation
Wilting appears due to excessive Transpiration Answer : (d)
Q.29
Guard cells regulate .... .... [ Bih PMT 2004]
0%
a) Photosynthesis
0%
b) Intensity of light entering leaves
0%
c) Change in green colour
0%
d) Closing and opening of stomata
Explanation
Guard cells regulate Closing and opening of stomata Answer : (d)
Q.30
A bottle filled with previously moistened Mustard seeds and water was screw capped tightly and kept in a corner, It blew up suddenly after about half an hour. The phenomenon involved is ... ...[ CBSE 1990]
0%
a) Diffusion
0%
b) Imbibition
0%
c) Osmosis
0%
d) D.P.D
Explanation
Imbibition is a special type of diffusion when water is absorbed by solids-colloids causing an enormous increase in volume. Due to incresed volme exerted high pressure on bottle causes blew up Answer : (b)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page