NEET 2000 Biology question

Not in NEET syllabus

When the plants are grown in magnesium deficient but urea rich soil; the symptoms expressed are :

(1)Yellowish leavesCorrect
(2)Colourless petiole
(3)Dark green leaves
(4)Shoot apex die

Answer: (1)

Solution

Magnesium is a constituent of the chlorophyll molecule (it occupies the centre of the porphyrin ring) and is also an activator of many enzymes (RuBisCO, PEPcase). Its deficiency causes interveinal chlorosis, i.e. yellowing of leaves, beginning in the older leaves because Mg is mobile. Urea supplies abundant nitrogen

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Question ID VK-088636