First slide

Long Distance Transport of Water

Question

Choose the incorrect statement

Moderate

A

Much of the nitrogen of xylem sap is present in the form of nitrates.
B

Small amounts of P and S are carried through xylem in organic form.
C

Small amount of exchange of materials takes place between xylem and phloem.
D

Phloem sap has small amounts of inorganic nutrients.

Solution

In the xylem sap much of the nitrogen is carried in organic form particularly in the form of amino acids and amides. Only small amount is carried in inorganic form. Much of the P and S are carried in inorganic form and only a little is carried in organic form. There is small exchange of materials between xylem and phloem. Phloem has small amounts of inorganic nutrients thought bulk of it has organic nutrients mainly sucrose.

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