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！