3.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>질소결핍식물의특징(인결핍식물에 stem이언급x)
D. Reddish pigmentation on the leaves or stem
我的答案 A
正确答案 B
Mineral deficiencies can often be detected by specific symptoms such as chlorosis (loss of chlorophyll resulting in yellow or white leaf tissue), necrosis (isolated dead patches), anthocyanin formation (development of deep red pigmentation of leaves or stem), stunted growth, and development of woody tissue in an herbaceous plant. Soils are most commonly deficient in nitrogen and phosphorus. Nitrogen-deficient plants exhibit many of the symptoms just described. Leaves develop chlorosis; stems are short and slender, and anthocyanin discoloration occurs on stems, petioles, and lower leaf surfaces. Phosphorus-deficient plants are often stunted, with leaves turning a characteristic dark green,(b의근거) often with the accumulation of anthocyanin. Typically, older leaves are affected first as the phosphorus is mobilized to young growing tissue. Iron deficiency is characterized by chlorosis between veins in young leaves.
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문제에서는 인결핍식물에서는 나타나는현상인데, 질소나 철부족식물은 나타나지않는현상을 묻는것같아요!
(즉, 인결핍식물에서만 나타나는 현상)
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