问题

According to paragraph 2, which of the following symptoms occurs in phosphorus-deficient p

According to paragraph 2, which of the following symptoms occurs in phosphorus-deficient plants but not in plants deficient in nitrogen or iron？

A．Chlorosis on leaves

B．Change in leaf pigmentation to a dark shade of green

C．Short, stunted appearance of stems

D．Reddish pigmentation on the leaves or stem

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参考答案

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