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

  1. High water potential in phloem
  2. Returning of water to sink
  3. Active transport of sucrose to sink
  4. All of these
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At the time of loading of phloem which of the following happens?

  1. High turgor pressure
  2. Flaccid phloem
  3. Plasmolysed Phloem
  4. Low water potential
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First sugar moves to

(At the time of loading of phloem)

  1. Companion cells
  2. Sieve tube cells
  3. Xylem vessels
  4. Phloem fibre
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The unloading at sink from phloem is

  1. Diffusion
  2. Facilitated Diffusion
  3. Active transport
  4. Imbibition
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The loading at source in the phloem is

  1. Diffusion
  2. Pressure flow
  3. Active transport
  4. Imbibition
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Girdling experiment suggests that

  1. Xylem is for water and mineral transport
  2. Phloem is for translocation of food
  3. Transport in phloem is multi directional as well
  4. The portion below the ring becomes swollen due to water
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Which of the following is an accepted mechanism for translocation of sugars from source to sink?

  1. Cohesion Flow hypothesis
  2. Pressure Flow hypothesis
  3. Mass fusion hypothesis
  4. Tension flow hypothesis
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Phloem sap is mainly

  1. Water and minerals
  2. Water and sucrose
  3. Hormones and amino acid
  4. Hormones and sucrose
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The source and sink may be reversed

  1. Depending on the season
  2. Depending on the plant's needs
  3. Depending on the phloem type
  4. Both A and B
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Which of the following is incorrect statement?

  1. 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
  2. Small amount of P and S is also carried as inorganic compounds in xylem exudate
  3. There is exchange of material between xylem and phloem
  4. Xylem transports inorganic nutrients while phloem transports organic materials, this observation was proved wrong by the analysis of xylem exudate
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