问题详情

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

请帮忙给出正确答案和分析，谢谢！