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

(1) Water and minerals

(2) Water and sucrose

(3) Hormones and amino acid

(4) Hormones and sucrose

(1) Cohesion Flow hypothesis

(2) Pressure Flow hypothesis

(3) Mass fusion hypothesis

(4) Tension flow hypothesis

(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

(1) Diffusion

(2) Pressure flow

(3) Active transport

(4) Imbibition

(1) Diffusion

(2) Facilitated Diffusion

(3) Active transport

(4) Imbibition

(1) High water potential in phloem

(2) Returning of water to sink

(3) Active transport of sucrose to sink

(4) All of these

(1) High turgor pressure

(2) Flaccid phloem

(3) Plasmolysed Phloem

(4) Low water potential

(1) Companion cells

(2) Sieve tube cells

(3) Xylem vessels

(4) Phloem fibre

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 the xylem and phloem.

4. Xylem transports inorganic nutrients while phloem transports organic materials, this observation was proved wrong by the analysis of xylem exudate.