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Which of the following is incorrect statement?

A. An analysis of xylem exudate suggests that some of the nitrogen travels as inorganic ions and much of it is carried in the organic form as amino acids B. Small amount of P and S is also carried as inorganic compounds in xylem exudate C. There is exchange of material between xylem and phloem D. Xylem transports inorganic nutrients while phloem transports organic materials, this observation was proved wrong by the analysis of xylem exudate

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Explanation

Page number-190

11.5 Uptake and Transport of Mineral Nutrients

11.5.2 Translocation of Mineral Ions

Transport in Plants

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The source and sink may be reversed

A. Depending on the season B. Depending on the plant's needs C. Depending on the phloem type D. Both A and B

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Explanation

Page number-190

11.6 Phloem Transport: Flow From Source To Sink

Transport in Plants

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Phloem sap is mainly

A. Water and minerals B. Water and sucrose C. Hormones and amino acid D. Hormones and sucrose

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Explanation

Page number-190

11.6 Phloem Transport: Flow From Source To Sink

Transport in Plants

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Girdling experiment suggests that

A. Xylem is for water and mineral transport B. Phloem is for translocation of food C. Transport in phloem is multi directional as well D. The portion below the ring becomes swollen due to water

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Explanation

Page number-192

11.6.1 The Pressure Flow or Mass Flow Hypothesis

Transport in Plants

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The loading at source in the phloem is

A. Diffusion B. Pressure flow C. Active transport D. Imbibition

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Explanation

Page number-191

11.6.1 The Pressure Flow or Mass Flow Hypothesis

Transport in Plants

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The unloading at sink from phloem is

A. Diffusion B. Facilitated Diffusion C. Active transport D. Imbibition

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Explanation

Page number-191

11.6.1 The Pressure Flow or Mass Flow Hypothesis

Transport in Plants

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At the time of unloading of phloem, which of the following does not happen?

A. High water potential in phloem B. Returning of water to sink C. Active transport of sucrose to sink D. All of these

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Explanation

Page number-191

11.6.1 The Pressure Flow or Mass Flow Hypothesis

Transport in Plants

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At the time of loading of phloem which of the following happens?

A. High turgor pressure B. Flaccid phloem C. Plasmolysed Phloem D. Low water potential

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Explanation

Page number-191

11.6.1 The Pressure Flow or Mass Flow Hypothesis

Transport in Plants

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First sugar moves to

(At the time of loading of phloem)

A. Companion cells B. Sieve tube cells C. Xylem vessels D. Phloem fibre

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Explanation

Page number-191

11.6.1 The Pressure Flow or Mass Flow Hypothesis

Transport in Plants

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The water potential and osmotic potential of pure water is :

100 and zero

Zero and Zero

100 and 100

Zero and 100

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Explanation

Water potential is the chemical potential of water, which depends on the number of water molecules in the solution. More the number of water molecules in the solution more the water potential.
By convention, water potential of pure water is assumed to be zero, so that water potential of all solutions is negative. The osmotic potential is the potential due to dissolved solutes.
More the number of dissolved solute particles, more the osmotic potential. In pure water the number of dissolved solute particles is zero, hence the osmotic potential is zero.

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