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Neet Botany Transport In Plants Mcq
Quiz 13
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Q.1
Potato slices were placed in sucrose solution. After half an hour, density of sucrose solution increased. Water potential of Potato tuber is ... ...[ JIPMER 1999 ]
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a) Equal to solute potential of sucrose solution
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b) Greater than solute potential of sucrose solution
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c) Less than solute potential of sucrose solution
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d) Half the concentration of sucrose solution
Explanation
Answer : (c)
Q.2
For keeping stomata open, besides K ions the guard cells require a constant supply of ... ....
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a) ABA
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b) ATP
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c) Organic acids
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d) Protons
Explanation
Answer : (b)
Q.3
Transpiration is dependent upon ... ... [ Odsiha 1995]
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a) Difference of vapour pressure
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b) Degree of stomatal opening
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c) Availability of green light
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d) Both a and b
Explanation
Answer : (d)
Q.4
Passage of water across a selectively permeable membrane is ... ...
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a) Active transport
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b) Pinocytosis
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c) Facilitated diffusion
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d) Osmosis
Explanation
Answer : (d)
Q.5
Root cap has no role in water absorption because ... ..... [ AIIMS 1990]
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a) It has no direct connection with the vascular system
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b) It has loosely arranged cells
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c) It has no cells containing chloroplasts
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d) It has no root hairs
Explanation
The root cap is a special layer of tissue which protects the tip of a growing root and helps to anchor the plant. Plants absorb water through their entire surface – roots, stems and leaves. However, the majority of water is absorbed by root hairs. Root hairs are thin-walled uni-cellular outgrowths of epidermis. They are in close contact with the thin film of water surrounding the soil particles. and thus root cap does not involve in the water absorption. Answer : (d)
Q.6
Movement of materials against concentration gradient is due to ... .. [ Bih PMT 2004]
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a) Active transport
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b) Passive transport
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c) Diffusion
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d) Osmosis
Explanation
Answer : (a)
Q.7
Active K+ exchange mechanism for opening and closing of stomata was given by ... ... [ BHU 1997]
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a) Darwin sup
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b) Levitt
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c) Scarth sup
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d) Khorana
Explanation
Answer : (b)
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]
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a) B to A
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b) A to B
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c) Equal in both directions
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d) No flow of water
Explanation
Answer : (a)
Q.9
Cells absorb water through ... ... [ AMU 1999 ]
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a) Osmosis only
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b) Imbibition only
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c) Both osmosis and imbibition
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d) None of the above
Explanation
Answer : (c)
Q.10
A wooden peg inserted in a rock causes its breaking during the rainy season. It is due to development of ... ...
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a) Turgor pressure
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b) Osmotic pressure
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c) Matric potential
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d) Plasmolysis
Explanation
Answer : (c)
Q.11
Transpiration and root pressure cause water to rise in plants by : …[AIPMT 2015]
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a) pushing and pulling it, respectively
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b) pulling it upward
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c) pulling and pushing it, respectively
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d) pushing it upward
Explanation
Answer:(c)
Q.12
Which of the following criteria does not pertain to facilitated transport ? …[NEET 2013]
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a) Requirement of special membrane proteins
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b) High selectivity
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c) Transport saturation
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d) Uphill transport
Explanation
Answer:(d)
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]
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a) Low refractive index
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b) Absence of sugar
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c) Acidic
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d) Alkaline
Explanation
Answer:(d)
Q.14
The water potential of pure water is….[NEET- 2017]
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a) Zero
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b) Less than zero
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c) More than zero but less than one
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d) More than one
Explanation
By convention, the water potential of pure water at standard temperature, which is not under any pressure, is taken to be zero. Answer:(a)
Q.15
Root pressure develops due to : [ ReAIPMT 2015]
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a) Increase in transpiration
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b) Active absorption
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c) Low osmotic potential in soil
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d) Passive absorption
Explanation
Answer:(b)
Q.16
Roots play insignificant role in absorption of water in : [ ReAIPMT 2015]
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a) Wheat
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b) Sunflower
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c) Pistia
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d) Pea
Explanation
Answer:(c)
Q.17
A column of water within xylem vessels of tall trees does not break under its weight because of : [ ReAIPMT 2015]
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a) Positive root pressure
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b) Dissolved sugars in water
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c) Tensile strength of water
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d) Lignification of xylem vessels
Explanation
Answer:(c)
Q.18
Which of the following elements is responsible for maintaining turgor in cells ? [NEET 2018]
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a) Magnesium
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b) Sodium
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c) Potassium
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d) Calcium
Explanation
Answer : (c)
0 h : 0 m : 1 s
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