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Quiz 11
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Q.1
Which does not cause stomatal opening? ... .. [ Manipal 2004]
0%
a) Influx of K+ ions
0%
b) Light
0%
c) High CO2 concentration
0%
d) Circadian rhythm
Explanation
Stomata tends to close when CO2 increases. Answer : (c)
Q.2
A nonliving continuum of cells walls and intercellular spaces is .... ... [ DPMT 2007]
0%
a) Ground complex
0%
b) Alburnum
0%
c) Apoplast
0%
d) Desmotubule
Explanation
The apoplast is the space outside the plasma membrane within which material can disperse freely. It is broken up by the Casparian strip in roots, by air spaces between plant cells and by the plant cuticle. The apoplast route facilitates the transportation of water and solutes across a tissue or organ Answer : (c)
Q.3
Water lost through transpiration is ... ...[ KCET 2002]
0%
a) Pure water
0%
b) Rich in organic solutes
0%
c) Rich in dissolved salts
0%
d) All the above
Explanation
Water lost through transpiration is in the form of water vapour Answer : (a)
Q.4
Plants exchange water with environment through structures by two cells .... ...[ AMU 2001]
0%
a) Lenticels
0%
b) Hydathodes
0%
c) Stomata
0%
d) All the above
Explanation
Plants exchange water with environment through structures by two cells Stomata guard cells are two bean-shaped cells that surround a stoma. Answer : (c)
Q.5
Water absorption by root hairs occurs until .... ...
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a) Concentration of water in the cell sap is higher
0%
b) Salt concentration in cell sap is higher
0%
c) They are separated from the soil by a selectively permeable membrane
0%
d) Water potential is lower
Explanation
Water absorption by root hairs occurs until Concentration of water in the cell sap is higher Water always moves from the system with a higher water potential to the system with a lower water potential. The internal water potential of a plant cell is more negative than pure water; this causes water to move from the soil into plant roots via osmosis. Answer : (d)
Q.6
Chlorophyllous cells fewer in number, unique in shape with inner walls thicker are .... ...[ EAMCET 2002]
0%
a) Guard cells
0%
b) Passage cells
0%
c) Subsidiary cells
0%
d) Bulliform cells
Explanation
Chlorophyllous cells fewer in number, unique in shape with inner walls thicker are Guard cells Answer : (a)
Q.7
Which of the following get accumulated in vacuoles of guard cells during stomatal opening ... ...[ DPMT 2011]
0%
a) Water, Ca and Mg
0%
b) Malate, Na and K
0%
c) Starch, K and Cl
0%
d) Malate, K and Cl
Explanation
Malate, K and Cl accumulated in vacuoles of guard cells during stomatal opening Answer : (d)
Q.8
In osmosis, the volume of solvent ( in solution) will ... ... [ AFMC 1996]
0%
a) Decreases
0%
b) Increases
0%
c) Remain constant
0%
d) Volume has no relation to osmosis
Explanation
In osmosis, the volume of solvent ( in solution) will Increases Answer : (b)
Q.9
Starch of guard cells is converted into PEP through ... ...[ GUj CET 2008]
0%
a) Hydrolysis
0%
b) Oxidation
0%
c) Dephosphorylation
0%
d) Decarboxylation
Explanation
Answer : (a)
Q.10
Water will be absorbed by root hairs when the external medium is ... .... [ AFMC 1993]
0%
a) Hypotonic
0%
b) Hypertonic
0%
c) Isotonic
0%
d) Viscous
Explanation
Water will be absorbed by root hairs when the external medium is Hypotonic Answer : (a)
Q.11
Which ones do not show transpiration? ... ..[ KCET 2005]
0%
a) Aquatic plants with floating leaves
0%
b) Aquatic submerged plants
0%
c) Plants growing in hilly areas
0%
d) Plants living in deserts
Explanation
Underwater leaves (finely divided) can absorb carbon dioxide directly from the water. Water is abundant so there is no need for transpiration to help cool and transport water and minerals into the leaves Answer : (b)
Q.12
At field capacity the soil contains ... .....
0%
a) Capillary and gravitational water
0%
b) Capillary and runaway water
0%
c) Capillary and hygroscopic water
0%
d) Capillary, hygroscopic and bound water
Explanation
Field Capacity is the amount of soil moisture or water content held in the soil after excess water has drained away and the rate of downward movement has decreased. FORMS OF SOIL MOISTURE: Forms of soil moistures are i) Chemically Bound Water ii) Hygroscopic Water iii) Capillary Water iv) Gravitational Water Answer : (d)
Q.13
Solute potential of a solution is always ... ..... [ DPMT 2010]
0%
a) = 0
0%
b) < 0
0%
c) > 0
0%
d) Between 0.1 - 1.0
Explanation
Increase in the number of solute results in the decrease in the water potential, and therefore solute potential is always negative. Answer : (b)
Q.14
In plants water moves from ... ...[ AIIMS 2001]
0%
a) Less negative to more negative gradient
0%
b) More negative to less negative gradient
0%
c) Similar gradient
0%
d) Zero gradient
Explanation
Thus the osmotic potential of distilled water is zero, and becomes more and more negative on addition of solute Thus water always flow from lesser negative Osmotc potential to more more osmotic potential Answer : (a)
Q.15
Transpiration facilitates ... ...[ KCET 2009]
0%
a) Electrolyte balance
0%
b) Absorption of water by roots
0%
c) Opening of stomata
0%
d) Excretion of minerals
Explanation
Answer : (b)
Q.16
Match the columns ... ..... [ Manipal 2002]
a) Ganong's Potometer
i) Rate of growth
b) Cobalt chloride paper
ii) Rate of transpiration
c) Pfeffer's auxanometer
iii) Differential transpiration
d) Porometer
iv) Opening and closing of stomata
0%
a) a -i, b - ii, c - iii, d - iv
0%
b) a- iv, b - i, c - iii, d - ii
0%
c) a - ii, b - iii, c - i, d - iv
0%
d) a - iii, b - i, c - iv, d - ii
Explanation
Ganong’s potometer is used to measure the transpirate rate a - ii Dry cobalt chloride paper that is blue in colour turns pink when it comes in contact with water. Using this property of cobalt chloride paper we can study the rate of transpiration from the two surfaces of a leaf by comparing the loss of water vapour from the two surfaces of the leaf b - iii An auxanometer is an apparatus for measuring increase or rate of growth in plants. c - i The Leaf Porometer is a device used to measure stomatal conductance in leaves d - iv Answer : (c)
Q.17
Active absorption of water by roots from the soil is mainly affected by .... ...
0%
a) Tension in cell sap due to transpiration
0%
b) Hydrophobic nature of root hair
0%
c) Typical tissue organization
0%
d) Osmotic concentration of cell sap
Explanation
Active absorption of water by roots from the soil is mainly affected by Osmotic concentration of cell sap Answer : (d)
Q.18
An adaptation for better gaseous exchange in plant leaves is ... ...[ CBSE 1993]
0%
a) Hair on lower surface
0%
b) Multiple epidermis
0%
c) Waxy cuticle
0%
d) Stomata on lower surface away from direct sun rays
Explanation
Stomata are tiny pores found in the epidermis of leaves and other soft aerial parts. Stomata occur both on the upper and lower epidermal surfaces in mesophytic plants. Stomata are meant for gaseous exchange and are also the main source of transpiration. So an adaptation for better gaseous exchange in plant leaves is stomata are present on the lower surface which are away from direct sunlight are very much effective for gases exchange. Answer : (d)
Q.19
Which is wrong .... ...[ kerala 2007]
0%
a) Water potential is chemical potential of water
0%
b) Solute potential is always negative
0%
c) Pressure potential is zero in a flaccid cell
0%
d) Water potential equals solute potential in a fully turgid cell
Explanation
For fully turgid cell the water potential becomes zero when solute potential becomes equal to the pressure potential A fully turgid cell has its Solute potential and pressure potential equal but with opposite sign Answer : (d)
Q.20
A slice of Sugar Beet placed in concentrated salt solution would .... ... [ CPMT 2002]
0%
a) Become swollen
0%
b) Lose water and become flaccid
0%
c) Absorb small quantity of water
0%
d) Show no change
Explanation
A slice of Sugar Beet placed in concentrated salt solution would Lose water and become flaccid Answer : (b)
Q.21
Which one is against the theory of ascent of sap by Dixon and Joly .... .... [ Manipal 2003]
0%
a) Pores in tracheary elements
0%
b) Cohesion force of water molecules
0%
c) Adhesion force of water molecules
0%
d) Requirement of ATP
Explanation
According to theory of ascent of sap by Dixon and Joly there is no use of energy or ATP for the ascent of the sap Answer : (d)
Q.22
Epidermal cells containing chloroplasts are ... .....[ Uttarakhand 20011]
0%
a) Hydathodes
0%
b) Accessory cells
0%
c) Stomata
0%
d) Guard cells
Explanation
The guard cells contain chloroplasts, so they can manufacture food by photosynthesis (The epidermal cells do not contain chloroplasts) Guard cells are the only epidermal cells that can make sugar. Answer : (d)
Q.23
Water column does not rupture during ascent in tracheary elements due to ... .... [ CBSE 2008]
0%
a) Weak gravitational pull
0%
b) transpiration pull
0%
c) Lignified thick walls
0%
d) Cohesion and adhesion
Explanation
water molecules tend to stick to one another, by strong mutual forces of attraction called cohesion and adhesion forces. That's why water column does not rupture during ascent in tracheary elements even though it translocate water and carries through the xylem vessels to all parts of the plant body. The xylem is composed of dead cells with thick, lignified secondary cell walls. These form a low resistance pathway for the movement of solution. Answer : (d)
Q.24
A leafy twig of mesophytic plant dipped in water demonstrate ... .. [ MPPMT 1997]
0%
a) Photosynthesis
0%
b) Transpiration
0%
c) Respiration
0%
d) Guttation
Explanation
In Bose’s Potometer A freshly cut twig is inserted in water bottele Answer : (b)
Q.25
A negative effect of transpiration is ... ...[ Guj CET 2010]
0%
a) Development of water stress
0%
b) Increase in mineral absorption
0%
c) Maintenance of leaf temperature
0%
d) Causing cooling
Explanation
Transpiration often results in water deficit (capillary water) or development of water stress, which causes injury to the plants by desiccation. Answer : (a)
Q.26
Transpiration is helpful to plants in ... ... [ AFMC 1994]
0%
a) Cooling
0%
b) Loss of excess nutrients
0%
c) Upward conduction/ascent of sap
0%
d) Loss of excess water
Explanation
ranspiration is helpful to plants in Upward conduction/ascent of sap Answer : (c)
Q.27
Stomatal opening and closing is due to .... .... [ AFMC 2011]
0%
a) Change is turgidity of guard cells
0%
b) Cellulose microfibril of guard cells are oriented radially
0%
c) The inner wall of each guard cell is thick and less elastic
0%
d) All the above
Explanation
Answer : (d)
Q.28
Maximum transpiration takes place from ... ... [ AMU 1991]
0%
a) Stem
0%
b) Leaves
0%
c) Roots
0%
d) Flowers and fruit
Explanation
Maximum transpiration takes place from Leaves Answer : (b)
Q.29
Guard cells line ... ..... [ har PMT 2005]
0%
a) Stomata
0%
b) Hydathode
0%
c) Pneumatophore
0%
d) Lenticel
Explanation
Guard cells line Stomata Answer : (a)
Q.30
A cell is plasmolysed after being kept in hypertonic solution. What will be present between cell wall and plasmalemma? ... ... [ BHU 1991]
0%
a) Isotonic solution
0%
b) Hypertonic solution
0%
c) Air
0%
d) Hypotonic solution
Explanation
Answer : (b)
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