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Mass Flow Hypothesis

Bulk flow is ...

Question

Bulk flow is achieved due to a positive hydrostatic pressure gradient in _and negative hydrostatic pressure gradient in _ respectively.

A

Xylem and phloem

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B

Phloem and xylem

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C

Root xylem and leaf xylem

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D

Leaf phloem and root phloem

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Solution

The correct option is B
Phloem and xylem

Bulk 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. 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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