Which Answer Best Explains How Nitrogen Deficiency in Plants Causes

Which answer best explains how nitrogen deficiency in plants causes chlorosis at the tips of older leaves?

A) Nitrogen is a component of chlorophyll, but it is mobile and is re-located from older leaves to growing parts.
B) Nitrogen is necessary to synthesize chlorophyll in mature areas of older leaves.
C) Nitrogen is a component of all enzymes, so new growth will stop if nitrogen is deficient.
D) Nitrogen regulates proton pumps that supply energy to growing tissue at the tips of older leaves.

Correct Answer:

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