Q91. Potometer works on the principle of
(1) Osmotic pressure
(2) Amount of water absorbed equals the amount transpired
(3) Root pressure
(4) Potential difference between the tip of the tube and that of the plant
Ans.2
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Q92. Which of the following get accumulated in the vacuoles of guard cells during stomatal opening?
(1) Water, calcium and magnesium
(2) Starch, potassium and chloride ions
(3) Malate, sodium and potassium ions
(4) Malate, potassium and chloride lons
Ans.4
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Q93. The movement of water, from one cell of cortex to adjacent one in roots, is due to
(1) Accumulation of inorganic salts in the cells
(2) Accumulation of organic compounds in the cells
(3) Water potential gradient
(4) Matrix potential gradient
Ans.3
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Q94. Which of the following is the most accepted theory for movement of water through plants?
(1) Cohesion tension theory
(2) Capillarity
(3) Imbibition theory
(4) Root pressure
Ans.1
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Q95. The translocation of organic solutes in sieve tube members is supported by
(1) Cytoplasmic streaming
(2) Root pressure and transpiration pull
(3) P-proteins
(4) Mass flow involving a carrier and ATP
Ans.4
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Q96. Loading of phloem is related to
(1) Increase of sugar in phloem
(2) Elongation of phloem cell
(3) Separation of phloem parenchyma
(4) Strengthening of phloem fiber
Ans.1
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Q97. Bidirectional translocation of solutes takes place in
(1) Parenchyma
(2) Cambium
(3) Xylem
(4) Phloem
Ans.4
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Q98. Water potential is
A. Mainly determined by solute potential and pressure potential
B. Taken to be zero for pure water at standard temperature which is not under any pressure
(1) Only B is correct
(2) Both A and B are correct
(3) Both A and B are incorrect
(4) Only A is correct
Ans.2
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Q99. Wooden doors and windows swell up and stuck in rainy season, it is due to
(1) Endosmosis
(2) Plasmolysis
(3) Deplasmolysis
(4) Imbibition
Ans.4
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Q100. The movement of water through the system of interconnected protoplasts also involve
(1) Mass flow
(2) Intercellular spaces only
(3) Cytoplasmic streaming
(4) Walls of the cells
Ans.3
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Q101. Loss of water in liquid phase from leaf tips of herbaceous plants is --A-- It occurs due to --B--
(1) A Guttation B-Transpiration pull
(2) A-Transpiration B-Transpiration pull
(3) A-Guttation B-Root pressure
(4) A-Transpiration B-Root pressure
Ans.3
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Q102. Immediate cause of the opening or closing of the stomata is
(1) Change in the turgidity of the guard cells
(2) Low light intensity
(3) High humidity in atmosphere
(4) Longitudinal orientation of cellulose microfibrils in guard cells
Ans.1
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Q103. All are the chief sinks of mineral elements, except
(1) Apical meristem
(2) Storage organ
(3) Young leaves
(4) Senescent organs
Ans.4
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Q104. Which of the following is the correct sequence of events involved in phloem transport?
(1) Source [loading] - Sieve tubes - Companion cells - Sink [unloading]
(2) Source [unloading] - Companion cells - Sieve tubes - Sink [loading]
(3) Source [loading] - Companion cells - Sieve tubes - Sink [unloading]
(4) Sink [loading] - Companion cells - Sieve tubes - Source [unloading]
Ans.3
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Q105. Which of the following requires energy?
(1) Imbibition
(2) Facilitated diffusion
(3) Loading of food in phloem
(4) Simple Diffusion
Ans.3
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