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 6
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
An internal factor in transpiration is .... .... [ CPMT 2000 ]
0%
a) CO2
0%
b) O2
0%
c) N2
0%
d) Stomata
Explanation
Answer : (d)
Q.2
Efflux of K+ and Cl will cause ..... ...
0%
a) Closure of stomata
0%
b) Opening of stomata
0%
c) Increased turgidity
0%
d) Imbibition
Explanation
The influx and efflux of potassium and chlorine regulate the opening and closing of stomata. Efflux of K+ and Cl will cause closure of stomata Answer : (a)
Q.3
Exudation of xylem sap on cutting of a shoot is due to ... .. [ RPMT 1996]
0%
a) Guttation
0%
b) Root pressure
0%
c) Transpiration
0%
d) None of the above
Explanation
The exudation of water on cutting stem is known as bleeding. And is occur due to root pressure. Guttation is also occur due to rooty pressure and in guttation water droplets comes out from hydathodes present in leaf margins. . Transpiration is the evaporation of water from the upper surface of the leaves. Explanation is provided by Mr Sunil Gurjar Answer : (b)
Q.4
What causes opening of stomata ... ... [ Guj CET 2010]
0%
a) Thin wall of guard cell facing stomatal pore is stretched more, curves in and the pore opens
0%
b) Thick wall of guard cell facing stomatal pore is stretched more, moves in and pore opens
0%
c) As thin wall of guard cell is stretched less, the guard cell wall facing the stomatal pore moves in and pore opens
0%
d) Thick wall of guard cell facing the stomatal pore is stretched less, moves in and the pore opens
Explanation
When the osmotic concentration of the guard cells increases, they absorb water from the surrounding epidermal cells and become turgid. Increased turgidity causes the outer elastic wall of the guard cells to stretch towards outside. The inner thick and inelastic wall also gets pulled along with it and assumes a concave shape. The stomatal pore between the two guard cells opens in this condition. When guard cells lose water and become flaccid, the stomata close. Answer : (d)
Q.5
Ringing/girdling experiment was first performed by ... .... [ RPMT 2005]
0%
a) Hartig
0%
b) Strasburger
0%
c) Godlewski
0%
d) Bose
Explanation
Ringing or girdling experiment is a strategy was first performed by Hartig (1837) in which the outer tissues (bark) of a stem are detached, and leaving only the xylem and pith unharmed Answer : (a)
Q.6
Guttation occurs when ... ..
0%
a) Wind velocity is high
0%
b) Humidity increases
0%
c) Root pressure is less and transpiration rate is more
0%
d) Root pressure is more and transpiration rate is less
Explanation
The process of guttation occurs when the roots of a plant absorb water from the soil and loss of water through transpiration is less. This creates a pressure inside the plant, and the water is forced out through the hydathodes. Answer : (d)
Q.7
Transpiration is least in ... .... [ KCET 2006]
0%
a) Good soil moisture
0%
b) Highly wind velocity
0%
c) Dry environment
0%
d) High atmospheric humidity
Explanation
As the relative humidity of the air surrounding the plant rises the transpiration rate falls. It is easier for water to evaporate into dryer air than into more saturated air. Wind and air movement: Increased movement of the air around a plant will result in a higher transpiration rate Answer : (d)
Q.8
Force developed in cortex of root which pushes water into xylem of root is ... ....[ Odisha 2005]
0%
a) Root pressure
0%
b) Turgor pressure
0%
c) Osmotic pressure
0%
d) Diffusion
Explanation
Root pressure, in plants, force that helps to drive fluids upward into the water-conducting vessels (xylem). It is primarily generated by osmotic pressure in the cells of the roots and can be demonstrated by exudation of fluid when the stem is cut off just aboveground. Answer : (a)
Q.9
If a cell gets reduced in size when placed in solution, the solution is ... ... [ AFMC 2009]
0%
a) Hypertonic
0%
b) Hypotonic
0%
c) Weak
0%
d) Saturated
Explanation
If a cell is placed in a hypertonic solution, water will leave the cell, and the cell will shrink. Answer : (a)
Q.10
Which is the most important factor regulation of transpiration ... ..[ JKCMEE 2002]
0%
a) Light
0%
b) Temperature
0%
c) Humidity
0%
d) Above all
Explanation
Increased temperature. and presence of wide open stomata increase the rate of transpiration. Light is the most important factor in the regulation of transpiration. As the relative humidity of the air surrounding the plant rises the transpiration rate falls. It is easier for water to evaporate into dryer air than into more saturated air. Answer : (d)
Q.11
Rate of transpiration is related to ... .... [ EAMCET 1999 ]
0%
a) Light and temperature
0%
b) Light, temperature, atmospheric humidity and wind
0%
c) Light, temperature and wind
0%
d) Soil and temperature
Explanation
Answer : (b)
Q.12
Thin and elastic walls of guard cells are ... ...[ MHTCET 2008]
0%
a) Inner and lateral
0%
b) Inner
0%
c) Outer
0%
d) Outer and lateral
Explanation
Answer : (d)
Q.13
Water potential in leaf tissue is 'positive' (near zero) during ... .. [ CBSE 1997]
0%
a) Low transpiration
0%
b) Excessive absorption
0%
c) Excessive transpiration
0%
d) Guttation
Explanation
when there are more water molecules in the system, water potential is expected to be higher, e.g., under conditions of low transpiration in leaf tissue the water potential is expected to be positive. When transpiration is low, considerably more water molecules will be stuffed up inside leaf in the intercellular spaces giving rise to a positive water potential Answer : (a)
Q.14
Which is not directly connected with ascent of sap .... ... [ MHT CET 2011]
0%
a) Cohesion theory
0%
b) Root pressure
0%
c) Apoplast-symplast
0%
d) Capillarity
Explanation
The apoplast pathway facilitates the transport of water and solutes across a tissue or organ. Symplast Pathway: The inner side of the plasma membrane is the symplast. Answer : (c)
Q.15
Physiological demonstration of osmosis is carried out by ... .... [ KCET 2007]
0%
a) Potometer
0%
b) Bell jar experiment
0%
c) Thistle funnel whose mouth is tied with egg membrane
0%
d) Thistle funnel whose mouth is tied with parchment paper
Explanation
Demonstration of Osmosis process by Thistle Funnel Method. Since the egg membrane is semi-permeable, water can move in but proteins cannot move out, egg membrane is used insted of parchment paper Answer : (c)
Q.16
Which one gives the most valid explanation for guard cell movements ... ...[ MPPMT 1991]
0%
a) Guard cell photosynthesis
0%
b) Starch hydrolysis theory
0%
c) Potassium influx and efflux
0%
d) Transpiration
Explanation
Answer : (c)
Q.17
Which one is responsible for opening and closing of stomata ... ... [ JKCMEE 2004]
0%
a) Rise in pH of guard cells causes hydrolysis of starch
0%
b) Cytokinins and cAMP are required
0%
c) Abscisic acid promotes closure
0%
d) All the above
Explanation
When there is the rise in pH it causes hydrolysis of starch into sugar which accumulates in guard cells which results in the opening of cells. For this mechanism, cytokinins and cAMP are required. Abscisic acid is the stress hormone which results in the closing of stomata. Answer : (d)
Q.18
Water passes into a cell or one cell to another due to ... ... [ RPMT 2002 ]
0%
a) O.P.
0%
b) D.P.D
0%
c) W.P.
0%
d) Diffusion
Explanation
Cells gain or lose water among themselves on the basis of their water potential or DPD and not their solute or osmotic potentials only. Movement of water (solvent) takes place from lower DPD to high DPD or form higher water potential to lower water potential. Answer : (b)
Q.19
Uniformly sweet taste of Tea or Coffee is due to ... ...[ JIMER 2002]
0%
a) Spreading
0%
b) Osmosis
0%
c) Permeability
0%
d) Diffusion
Explanation
Diffusion is the net movement of a substance from a region of high concentration to a region of low concentration. A gradient is a change in the value of a quantity (e.g., concentration, pressure, temperature) with the change in another variable (e.g., distance). The uniformly sweet taste of coffee or tea is also an example of diffusion. Here, when added tea or coffee powder to milk/water, movement of substance takes place from high concentration to lower concentration. Answer : (d)
Q.20
Match the columns .... ....[ KCET 2001]
a) Girdling experiment
p) Ascent of sap
b) Cobalt chloride paper method
q) Transpiration
c) Atmometer
r) Unequal transpiration on two surfaces
d) Bell jar experiment
s) Translocation in phloem
0%
a) a - s, b - p, c - q, d - r
0%
b) a- s, b - r, c - p, d - q
0%
c) a-q, b-p, c-s, d-r
0%
d) a-r, b-p, c-s, d-q
Explanation
Girdling experiment experiment proves that phloem is responsible for translocation of organic material. a- s Cobalt chloride paper method is performed to demonstrate unequal transpiration on two surfaces. As lower surface have more stomata than upper surface so transpiration is more on the lower surface b - r An atmometer or evaporimeter is a scientific instrument used for measuring the rate of water evaporation from a wet surface to the atmosphere. c - p Bell jar experiment demonstrate Transpiration d - q Answer : (b)
Q.21
Which pathway involves cell wall and intercellular spaces ... ...[ DPMT 2010]
0%
a) Vascular pathway
0%
b) Protoplast pathway
0%
c) Symplast pathway
0%
d) Apoplast pathway
Explanation
The apoplast pathway is where water takes a route going from cell wall to cell wall, not entering the cytoplasm at any point. Answer : (d)
Q.22
Root pressure is due to ... ... [ MPPMT 1993]
0%
a) Active absorption/transport
0%
b) Passive absorption/transport
0%
c) Increased transpiration
0%
d) Increased photosynthesis
Explanation
Root pressure is due to various ions from the soil are enter the root by active absorption and ions are actively transported into the vascular tissues of the roots, water follows (its potential gradient) and increases the pressure inside the xylem. Answer : (a)
Q.23
Which is not purpose of transpiration .... ... [ kerala 2012]
0%
a) Prevents loss of water
0%
b) Helps in absorption and transport
0%
c) Makes cells rigid
0%
d) Cools leaf surfaces
Explanation
Answer : (a)
Q.24
In seed germination the first to occur is ... ... [ Bih PMT 1995]
0%
a) Diffusion
0%
b) Osmosis
0%
c) Imbibition
0%
d) All the above
Explanation
When water is plentiful, the seed fills with water in a process called imbibition. Answer : (c)
Q.25
Cell wall shows .... ..... [Manipur 2007]
0%
a) Semi-permeability
0%
b) Differential permeability
0%
c) Complete permeability
0%
d) Impermeability
Explanation
The cell wall of most plant cells is completely permeable to small proteins (size- 30-60 kilodaltons), water and other molecules etc. Answer : (c)
Q.26
In which of the following plants would metabolism be hindered if the leaves are coated with wax on their surface ... ... [ DPMT 1992]
0%
a) Hydrilla
0%
b) Lotus
0%
c) Psistia
0%
d) Vallisneria
Explanation
Answer : (b)
Q.27
Passive absorption occurs due to ... .... [ RPMT 2005]
0%
a) Tension in root
0%
b) Tension in xylem sap
0%
c) ATP
0%
d) None of the above
Explanation
As ions accumulate in the root xylem, the osmotic potential of the xylem solution falls causing the passive uptake of water from the soil by osmosis into the xylem. As pressure builds up within the xylem due to osmotic water uptake, the xylem solution is forced upward to the leaves by mass flow. Answer : (b)
Q.28
The force which determines the flow of water from one cell to another is ... ... [ Pb PMT 1999 ]
0%
a) T.P
0%
b) D.P.D/ψw
0%
c) O.P.
0%
d) W.P.
Explanation
The force which determines the flow of water from one cell to another is diffusion pressure deficit. Diffusion pressure deficit (DPD) is the amount by which two solutions differ in their diffusion pressure Answer : (b)
Q.29
Which can preserve food stuff ... ..[ MPPMT 2002]
0%
a) Sugar and vinegar
0%
b) Salt and sugar
0%
c) Vinegar
0%
d) All the above
Explanation
Answer : (d)
Q.30
Who said that "transpiration is a necessary evil"? ... ...[ MPPMT 1999 ]
0%
a) Bose
0%
b) Steward
0%
c) Anderson
0%
d) Curtis
Explanation
Curtis (1926) called transpiration as necessary evil because it provides some beneficial aspects but on the other hand, many functioning and energy gets wasted from absorption of water upto the stage of transpiration. Answer : (d)
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