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Phloem Transport

Gradient pres...

Question

Gradient pressure as a possible mechanism of translocation of food was given by

A

Curtis

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B

Munch

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C

Dixon and Jolly

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D

Mason and Maskel

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Solution

The correct option is C Munch
Gradient pressure theory was provided by Munch. According to this theory a gradient of osmotic pressure and hence turgor pressure is established within the sieve tube as a result of entry of photosynthates from the leaf mesophyll, and their removal for consumption in areas of growth and storage.
So, the correct answer is 'Munch'

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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.

Q. Statements.
(1) Dixon Jolly proposed a cohesion-tension theory for the ascent of sap in plants.
(2) Root pressure accounts in the ascent of sap in small plants.
(3) Food (solutes) translocation is a bidirectional movement mechanism.
(4) Imbibition plays an important role in seed germination.
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