Select the incorrect statement.

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Elements most easily mobilized in plants from one region to another are phosphorus, nitrogen and potassium

Unloading of sucrose at sink does not involve the utilization of ATP

Movement of minerals in xylem is unidirectional

Transport of molecules in phloem can be bidirectional

answer is D.

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Detailed Solution

Both loading and unloading of sucrose or sugars from sieve tube elements are active phenomena and involve utilisation of ATP.
(1) Phosphorus (P), nitrogen (N) and potassium (K) are mobile nutrients.
These are elements that can be easily translocated within the plant from older to younger tissues, when needed.
(2) The transport of molecules in the phloem, a vascular tissue in plants responsible for long-distance nutrient transport, can occur bidirectionally. There are two main types of transport: (a) source-to-sink transport (b) sinkto- source transport.
(3) The movement of minerals in the xylem, a vascular tissue in plants responsible for the transport of water and minerals from the roots to the rest of the plant, is unidirectional.

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