NEET Biology question
Not in NEET syllabus
A small aquatic plant was placed in each of three petri dishes — X, Y and Z — containing different culture solutions. After six weeks, the plant in dish X had the same number of leaves as before, and these were all small and yellowish; the plant in dish Y had more leaves of normal size and dark green colour; and the plant in dish Z had more leaves of normal size but very pale. Which elements are missing from the respective culture solutions in X, Y and Z?
Solution
In dish X, the leaves remain small, reduced in number, and yellowish — this combination of stunted growth with chlorosis best fits magnesium deficiency, since magnesium is directly required for chlorophyll synthesis and its lack both limits growth and causes yellowing. In dish Y, growth is normal with dark green
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