Biology Multiple Choice Questions and Answers for Different Competitive Exams

MCQ on Translocation of Water

1. Which of the following element is responsible for maintaining turgor?
a)Na
b)Ca
c)P
d)K
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2. Why the tropical deciduous forest trees shed their leaves?
a)to prevent loss of water
b)to enhance the rate of absorption
c)to enhance rate of transpiration
d)to prevent loss of water

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3. Which one of the following is produced during water stress and cause closure of stomata
a)Abscisic acid
b)cytokinin
c)Ethylene
d)Gibberellic acid

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4. Which one of the following  plant would metabolism be hindered if the leaves are coated with wax on their upper surface?:
a) Hydrilla
b)Vallisnaria
c)Lotus
d)Pistia

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5. Which one of the following is used for measuring the rate of transpiration
potometer
a)potometer
b)porometer
c)osmometer
d)None of these

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6. Stomata open at night and close during day time in
a) xerophytes
b)mesophytes
c)hydrophytes
d)epiphytes

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7. Phenyl Mercuric acetate (PMA) results in
a) killing of plants
b)reduced respiration
c)reduced transpiration
d)reduced transpiration

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8. Active K+ exchange mechanism for opening and closing stomata was given by:
a) Darwin
b)Levitt
c)Scarth
d)Khorana

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9. Which one explains ascent of sap
a)Cohesion theory
b)Mass flow
c)Malate hypothesis
d)Interfacial flow hypothesis

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10.The principal pathways by which water is translocated in angiosperms is
 a)xylem vessel system
b) sieve cells of phloem
c) xylem and phloem together
d)sieve tube members of phloem
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