Why Can't Plants Use N2 Directly as a Nutrient

question 80

Multiple Choice

Why can't plants use N2 directly as a nutrient?

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

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