Question

Read the statements with respect to phloem
transport and find the odd one out.
(1) Active transport
(2) Bidirectional
(3) Sucrose loading in phloem causes hypertonicity
in phloem
(4) Loss of sucrose from phloem helps in absorption
of water from xylem by phloem​

Answer 1

Answer:

OPTION 3

Explanation:

Answer 2

Sucrose is actively loaded into phloem. As the hypertonicity of phloem increases water from xylem moves into phloem by endosmosis.This creates turgor pressure in phloem causing movement of the phloem sap into region of low tonicity, that is, towards Sink and here in sink this phloem sap gets actively unloaded and since the the osmotic pressure in phloem has decreased the water moves back to xylem by exosmosis.

But option (4) states that loss of sucrose from phloem helps in absorption of water from xylem by phloem. it is incorrect. Actually water is absorbed from phloem by xylem.

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