Why Canʹt Plants Use N2 Directly as a Nutrient

question 37

Multiple Choice

Why canʹt plants use N2 directly as a nutrient?

• A) N2 diffuses out of leaves as quickly as it diffuses in, so it has to be ʺfixedʺ to remain in leaves.
• B) Plants lack the enzymes necessary to convert N2 into NO3−or NH4+.
• C) Most soils are depleted of N2 as a nutrient.
• D) Plants must use NO3− to carry out nitrogen fixation.
• E) The N2 molecule is too large to enter the stomata.

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