Q136. Although a girdled (upto bast) tree may survive for sometime, but it will eventually die because
(1) Water will not move upward
(2) Water will not move downward
(3) Sugars and other organic solutes will not move downward
(4) Sugars and other organic solutes will not move upward
Ans.3
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Q137. Phloem loading and unloading process are respectively
(1) Active, Passive
(2) Passive, Active
(3) Active, Active
(4) Passive, Passive
Ans.3
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Q138. A. Much of nitrogen in xylem sap is carried in organic form.
B. In phloem, movement of nutrients is always unidirectional.
(1) Only A is correct
(2) Only B is correct
(3) Both A & B are correct
(4) Both A & B are incorrect
Ans.1
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Q139. Requirement of special membrane proteins and highly selective nature are features related to
(1) Simple diffusion
(2) Facilitated diffusion
(3) Active transport
(4) More than one option is correct
Ans.4
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Q140. Phenomenon of plasmolysis can be exploited for
(1) Causing plasmolysis of microbes in highly salted pickles
(2) Preventing growth of mirobes in jams and jellies
(3) Elimination of weeds
(4) All of these
Ans.4
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Q141. According to potassium pump theory, which activity will not occur for the opening of stomata?
(1) Dissociation of malic acid
(2) Passive process of ion exchange
(3) Transport of H+ ions from guard cells to subsidiary cells
(4) Increased OP of guard cells by potassium malate
Ans.2
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Q142. Find odd one w.r.t. chief sink for mineral elements
(1) Apical and lateral meristem
(2) Young leaves
(3) Fruits and seeds
(4) Mature leaves
Ans.4
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Q143. Which of the following contributes about 1% of the total transpiration in plants?
(1) Bark transpiration
(2) Cuticular transpiration
(3) Lenticular transpiration
(4) Stomatal transpiration
Ans.1
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Q144. Cobalt-Chloride test is for demonstration of
(1) Imbibition
(2) Transpiration
(3) Guttation
(4) More than one option is correct
Ans.2
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Q145. Select an incorrect statement
(1) Guard cells are dumb-bell shaped in Poaceae
(2) Inner wall of the guard cell is thin and elastic in dicots
(3) Cellulosic microfibrils are arranged radially in guard cells
(4) Guard cells are bordered by one or more subsidiary
Ans.2
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Q146. Which of the following substance acts as best imbibant?
(1) Phycocolloids
(2) Protein
(3) Starch
(4) Cellulose
Ans.1
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Q147. What is/are essential for imbibition to occur?
(1) Affinity between imbibant and imbibate
(2) Water potential gradient between imbibant and imbibate
(3) Low temperature condition
(4) More than one option is correct
Ans.4
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Q148. During process of active absorption of water
(1) The responsible force develops in roots
(2) Rate will be higher than passive absorption
(3) A negative pressure is developed in root xylem
(4) OP and energy play no role
Ans.1
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Q149. Select an incorrect statement
(1) Root pressure has never been observed in conifers
(2) Root pressure cannot be inhibited by using cyanide, lack of O2 and low temperature
(3) Root pressure can re-establish the continuous chain of water molecules in the xylem
(4) Develops during early morning and night
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Q150. According to Dixon and Jolly theory, all given factors contribute to ascent of sap, except
(1) Cohesive and adhesive force of water
(2) Vertical water column in xylem fibres and parenchyma
(3) Continuity of water column
(4) Transpiration pull
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