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 4
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
Which ones show physiological process called "necessary evil" ... ... [ EAMCET 2008] a) Potamogeton b) Sagittaria c) Limnophila d) Nymphaea
0%
a) b, c, d
0%
b) a, b, c
0%
c) a, b, d
0%
d) a, c, d
Explanation
Transpiration as a Necessary evil. It is a vital and unavoidable phenomenon of plants. The loss of water does not serve any good purpose in plant life. Besides, the transpiration also consumes energy and causes unnecessary absorption of excess water by roots Limnophila Species are known commonly as marsh weeds, shows cuticle and stomata Sagittaria is a genus of about 30 species of aquatic plants, upper epidermis shows stomata, cuticle Nymphaea is a genus of hardy and tender aquatic plants,it contains many stomata Transpiration remain absent in submerged hydrophytic plants because stomata are completely absent in leaves of submerged plants e.g., Anncharis and Potamogeton Answer : (a)
Q.2
The movement of water from one cell of cortex to the next in the root is due to ... .... [ CBSE 1995]
0%
a) Water potential gradient
0%
b) Chemical potential gradient
0%
c) Accumulation of inorganic salts in the cells
0%
d) Accumulation of organic salt in the cells
Explanation
Evaporation from mesophyll cells in the leaves produces a negative water potential gradient that causes water and minerals to move upwards from the roots through the xylem. Answer : (a)
Q.3
Attraction of water molecules to polar surface is known as ... ...[ kerala 2010]
0%
a) Adhesion
0%
b) Tensile strength
0%
c) Surface tension
0%
d) Cohesion
Explanation
Adhesion is the tendency of dissimilar particles or surfaces to cling to one another. Water is polar and hence cling to another dissimilar polar surface. while cohesion refers to the tendency of similar or identical particles/surfaces to cling to one another. Answer : (a)
Q.4
0.1M solution of solute ( nonelectrolyte) will have a water potential of .... ..[ MPPMT 1995]
0%
a) -2.3 bars
0%
b) zero
0%
c) 2.3 bars
0%
d) 22.4 bars
Explanation
The water potential can be calculated by the formula nRT, where n is number of moles, R the standard gas constant and T is standard temperature in Kelvin. Substituting the values of R (0.08314 lit bar per kelvin per more ), T (273 kelvin), n (0.1 moles) we get water potential 2.3 bars. As water potential of all solutions is always negative the correct answer will be -2.3 bars. Answer : (a)
Q.5
Upward movement of water in plants is ... ....[ BHU 2012]
0%
a) Translocation
0%
b) Suction
0%
c) Flight
0%
d) Ascent of sap
Explanation
The ascent of sap in the xylem tissue of plants is the upward movement of water and minerals from the root to the crown. Answer : (d)
Q.6
Element involved in stomatal regulation, its opening and closing is ... ... [ AMU 2005]
0%
a) Zinc
0%
b) Magnesium
0%
c) Potassium
0%
d) Iron
Explanation
This turgidity is caused by the accumulation of K+ (potassium ions) in the guard cells. Answer : (c)
Q.7
Wilting occurs due to .... ... [ Manipal 2005]
0%
a) Diffusion
0%
b) Imbibition
0%
c) Exosmosis
0%
d) Endosmosis
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 by Exosmosis, as a result of diminished water in the cells Exosmosis is passage of water through a cell membrane into the surrounding medium Answer : (c)
Q.8
DPD is equal to ... ... [ MPPMT 1992]
0%
a) OP × TP(WP)
0%
b) OP + TP(WP)
0%
c) OP - TP(WP)
0%
d) TP(WP) - OP
Explanation
DPD = OP - TP(WP) Here WP is wall pressure. Answer : (c)
Q.9
Pea seeds absorb more water and swell up more as compared to Paddy seeds due to ... ... [ Manipal 2003]
0%
a) Higher imbibition by proteins present in Pea seeds
0%
b) High osmotic potential of Pea seeds
0%
c) Paddy covering is impermeable to water
0%
d) All he above
Explanation
Imbibition is the process of adsorption of water by a substance. When pea seeds and wheat seeds are put in water, pea seeds will imbibe more water. Pea seed has high amount of protein present in it. Wheat seeds have high amount starch in it. The proteins imbibe more water as compared to the carbohydrates. Hence, proteinaceous pea seeds will imbibe more water than those of wheat seeds and swell up. Answer : (a)
Q.10
In plasmolysis, a plant cell ... ...[ KCET 1999 ]
0%
a) Swells up
0%
b) Bursts
0%
c) Becomes flaccid
0%
d) Becomes turgid
Explanation
A plant cell in a concentrated solution (lower water potential than the cell contents) Water leaves the cell by osmosis. The cytoplasm pulls away from the cell wall (plasmolysis) and the cell becomes flaccid and the plant wilts. Answer : (c)
Q.11
Most water flow in root occurs via apoplast as ... ...[ AMU 2009]
0%
a) Cortical cells are living cells
0%
b) Cortical cells are loosely arranged
0%
c) Cortical cells are thin walled
0%
d) All the above
Explanation
The apoplast path of water movement includes cell wall and intercellular spaces, which are fully permeable. The water can reach up to endodermis through apoplast The apoplast pathway involves the movement of water through the adjacent cell walls of the epidermis and cortex with out entering the cytoplasm. Answer : (b)
Q.12
Hydathodes occur on ... ... [ RPMT 1996]
0%
a) Stem
0%
b) Leaves
0%
c) Roots
0%
d) All the above
Explanation
Hydathodes occur in the leaves of submerged aquatic plants Hydathodes are commonly seen in water lettuce, water hyacinth, rose, balsam, and many other species. Hydathodes are the structures that discharge water from the interior of the leaf to its surface in a process called guttation. Answer : (b)
Q.13
Assertion Movement of materials inside phloem is bidirectional, both upwards and downwards Reason: Movement of molecules inside xylem is unidirectional always upwards
0%
a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
0%
b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
0%
c) Assertion is true but, Reason is false
0%
d) Assertion is false but, Reason is true
Explanation
Both Assertion and reson statement are true Companion cells actively transport sucrose into the phloem tubes. This active transport creates a high concentration of sucrose inside the phloem tube, there fore reason is not a explanation for Assertion. Answer : (b)
Q.14
In soil, the water available for root absorption is ... .. [ CBSE 1991]
0%
a) Gravitational water
0%
b) Capillary water
0%
c) Hygroscopic water
0%
d) Combined water
Explanation
Capillary water in soil is available for root absorption. Capillary water fills the spaces between non- colloidal soil particles and forms films around them. This water is held by the capillary forces around and between the particles and is of greatest importance to plant life. Answer : (b)
Q.15
Pulsation theory was proposed by ... ..... [ AMU 2005]
0%
a) Godlewski
0%
b) J.C. Bose
0%
c) Dixon and Joly
0%
d) Arthur
Explanation
Pulsation theory was proposed by J.C. Bose Answer : (b)
Q.16
Guttation is the process of elimination of water from plants through ... ... [ JIPMER 2005]
0%
a) Stomata
0%
b) Hydathodes
0%
c) Lenticels
0%
d) Wounds
Explanation
Guttation is the process of elimination of water from plants through Hydathodes Answer : (b)
Q.17
Which one is not connected with transport across the cell membrane ... ... [ BHU 2003]
0%
a) Osmosis
0%
b) Active transport
0%
c) Diffusion
0%
d) Surface tension
Explanation
Surface tension is the tendency of fluid surfaces to shrink into the minimum surface area possible. Answer : (d)
Q.18
Water tightly held to soil paricles is ... ...
0%
a) Bound water
0%
b) Capillary
0%
c) Hygroscopic water
0%
d) Runaway water
Explanation
Hygroscopic water: The water that held tightly on the surface of soil colloidal particle is known as hygroscopic water. It is essentially non-liquid and moves primarily in the vapour form. Answer : (c)
Q.19
When the concentration of solutes is greater outside the cells than inside the cells, the solution outside the cells is ... ...[ AFMC 2003]
0%
a) Isotonic
0%
b) Hypertonic
0%
c) Hypotonic
0%
d) None of the above
Explanation
Hypertonic refers to a solution with higher osmotic pressure than another solution. In other words, a hypertonic solution is one in which there is a greater concentration or number of solute particles outside a membrane than there are inside it. Answer : (b)
Q.20
Maximum transpiration occurs in ... ...[ AMU 1998]
0%
a) Algal cells
0%
b) Xerophytic plants
0%
c) Hydrophytic plants
0%
d) Mesophytic plants
Explanation
Maximum transpiration occurs in mesophyte because Leaves are generally large and rarely small, broad, thin and varied in shape, generally oriented horizontally witho0ut hair or waxy coatings Epidermis well developed, without any hairy or waxy coatings and cells without chloroplasts Answer : (d)
Q.21
What happens when concentration of solutes decreases in guard cells ... ...[ Guj CET 2009]
0%
a) Water potential decreases
0%
b) Water potential increases
0%
c) Osmotic pressure increases
0%
d) None of the above
Explanation
Solute potential (Ψs) increases with decrease solute concentration; a increase in Ψs causes a increase in the total water potential. The internal water potential of a plant cell is lesser negative than pure water Answer : (b)
Q.22
Which of the following factors is most important in regulation of transpiration .. ... [ JKCMEE 2011]
0%
a) Relative humidity
0%
b) Temperature
0%
c) Light
0%
d) Wind
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 Answer : (b)
Q.23
Correct pathway of water movement in plant roots is .... ... [ KCET 2012]
0%
a) Soil water → Root hair cell → Passage cells → Cortical cells → Xylem → Pericycle
0%
b) Soil water → Root hair cell → Pericycle → Cortical cells → Passage cells → Xylem
0%
c) Soil water → Root hair cell → Cortical cells → Passage cells → Pericycle → Xylem
0%
d) Soil water → Root hair cell → Cortical cell → Pericycle → Passage cells → Xylem
Explanation
Answer : (c)
Q.24
The movement of free atoms from higher concentration to lower concentration is called ... .... [ RPMT 1995]
0%
a) Osmosis
0%
b) Diffusion
0%
c) Endosmosis
0%
d) Exosmosis
Explanation
Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. Diffusion happens in liquids and gases because their particles move randomly from place to place. Answer : (b)
Q.25
Which one is correct? .... ... [ KCET 2006]
0%
a) ψw = ψm - (ψs + ψp)
0%
b) ψw = ψm - ψs - ψp
0%
c) ψw = ψm + ψs + ψp
0%
d) ψw = ψm + (ψs - ψp)
Explanation
Ψ = Ψm+Ψs+Ψp+Ψg Ψ = Water potential ( total or combined) Ψm = matric or capillary potential Ψs = solute or osmotic potential Ψp = pressure potential or turgor pressure Ψg = Gravitational potential Answer : (c)
Q.26
Which of the following is used to determine the rate of transpiration in plants? ... ... [ AFMC 1993]
0%
a) Porometer/hygrometer
0%
b) Potometers
0%
c) Auxanometer
0%
d) Tensiometer/Barometer
Explanation
potometer known as a transpirometer, is a device used for measuring the rate of water uptake of a leafy shoot which is almost equal to the water lost through transpiration. porometer is an instrument for measuring the area of the stomatal openings of a leaf by the amount of a gas passing through a given area of it. Auxanometer is an apparatus for measuring increase of growth in plants. Tensiometers are devices that measure soil moisture tension. Answer : (b)
Q.27
Match the columns ... ...[ KCET 2004]
a) Relay Pump Theory
p) Stocking
b) Transpiration-cohesion Theory
q) Bose
c) Mass Flow Theory
r) Godlewski
d) Pulsation Theory
s) Dixon and Joly;
- - - -
t) Munch
0%
a) a - r, b - q, c - t, d - p
0%
b) a - q, b - p, c - t, d - r
0%
c) a - r, b - s, c - t, d - q
0%
d) a - s, b - r, c - p, d - q
Explanation
Godlewski (1884) proposed his clambering or relay-pump theory to explain the vertical movement of water through the plant. a - r The cohesion-tension theory (C-T theory) by Boehm (1893) and Dixon and Joly (1894) postulates that the water ascent in trees is exclusively due to the transpirational pull from continuous water columns in the xylem conduit running from the roots to the leafs b - s The theory behind Mass flow hypothesis which is also called as pressure flow hypothesis describes the movement of sap via phloem, proposed by the German physiologist Ernst Munch in 1930 c - t Sir J.C. Bose proposed a theory of ascent of sap known as pulsation theory. d - q Answer : (c)
Q.28
DPD is abbreviated form of ... ... [ CPMT 1997]
0%
a) Daily photosynthetic deficit
0%
b) Daily phosphorus deficit
0%
c) Daily pressure deficit
0%
d) Diffusion pressure deficit
Explanation
Diffusion pressure deficit (DPD) Answer : (d)
Q.29
Main function of lenticel is ... ..[ CBSE 2002]
0%
a) Transpiration
0%
b) Guttation
0%
c) Bleeding
0%
d) Gaseous exchange
Explanation
Lenticel is providing a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark Answer : (d)
Q.30
Movement of water through semipermeable membrane produces .... ...[ CBSE 2001]
0%
a) Wall pressure
0%
b) Suction pressure
0%
c) Osmotic pressure
0%
d) Turgor pressure
Explanation
Turgor pressure is the force within the cell that pushes the plasma membrane against the cell wall. The pressure exerted by the osmotic flow of water is called turgidity. It is caused by the osmotic flow of water through a selectively permeable membrane 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