Nitrate (NO₃^-) Must Be Reduced to the Level of Ammonia

question 99

Multiple Choice

Nitrate (NO₃^-) must be reduced to the level of ammonia (NH₃) in leaves to be assimilated into amino acids. Which statement best describes the transport of nitrate and amino acids in plants?

• A) Nitrate enters the phloem in the roots and is transported to the leaves. Amino acids are transported to the rest of the plant by the phloem.
• B) Nitrate enters the xylem in roots by an entirely apoplastic route and is transported to the leaves. Amino acids are transported in the phloem.
• C) Nitrate enters the xylem in roots by a pathway that includes its transport across at least one plasma membrane and is transported to the leaves. Amino acids are transported in the phloem.
• D) Nitrate enters the xylem in roots by a pathway that includes its transport across at least one plasma membrane and is transported to the leaves. Amino acids are transported in the xylem.
• E) The nitrate concentration in phloem sap would be higher than that in xylem sap.

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