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Mass Flow Hypothesis

Bulk flow is ...

Question

Bulk flow is achieved due to positive hydrostatic pressure gradient and negative hydrostatic pressure gradient in respectively.

A

root hair and phloem

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B

phloem and xylem

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C

root hair and xylem

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D

leaves and phloem

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Solution

The correct option is B phloem and xylem
Bulk flow or mass flow occurs due to positive hydrostatic pressure gradient in phloem and organic solutes are pushed. In xylem, water along with inorganic solutes are pulled by the negative hydrostatic pressure gradient created by the transpirational loss of water from the leaves.

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Q. Bulk flow is achieved due to positive hydrostatic pressure gradient and negative hydrostatic pressure gradient in respectively.

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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.

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i) Bulk flow can be achieved through a positive hydrostatic pressure.
ii) Bulk flow can achieved through a negative hydrostatic pressure.
iii) Plasmolysis usually occurs in nature
iv) Imbibition also involves diffusion of water.

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