What is mass or bulk flow system?

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Solution

Mass flow or bulk flow is the movement of substances in bulk or in masses down a pressure gradient (in plants a pressure gradient is seen due to differences in solute concentration) or temperature gradient. E.g: blood circulation and the transport of water in vascular plants.

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Q. Assertion :Mass or bulk flow is the movement of substances in bulk from source to sink as a result of pressure differences. Reason: Water, minerals and food are generally moved by mass flow.

Assertion : Mass or bulk flow is the movement of substance en masse from one point to another, as a result of pressure difference between the two points.

Reason: It can be achieved only through positive hydrostatic pressure.

Q. Which of the following is true/false regarding transport of substances in plants?
(i) Mass flow is the movement of substance in bulk as a result of pressure difference.
(ii) Bulk flow is achieved only through a positive hydrostatic pressure gradient.
(iii) The apoplast system is the system of interconnected protoplasts.
(iv) Most of the water flow in the roots occurs via the apoplast since the cortical cells are loosely packed, and offer no resistance to water movement.

Q. Which of the following statements is/are not correct?
(i) Water and minerals, and food are generally moved by a mass or bulk flow system.
(ii) Bulk flow can be achieved either through a positive hydrostatic pressure gradient or a negative hydrostatic pressure gradient.
(iii) The bulk movement of substances through the conducting tissues of plants is called translocation.
(iv) Xylem translocates organic and inorganic solutes, mainly from roots to the aerial parts of the plants.
(v) Phloem translocates water, mineral salts, some organic nitrogen and hormones, from the leaves to other parts of the plants.

Q. A system or a group of systems, in which there is no net macroscopic flow of energy or matter either within the system or in between systems is known as?

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