Deficiency of ___________ causes yellowing in plants?
Correct answer: A. Magnesium
- A. Magnesium
- B. Iron
- C. Chlorine
- D. Oxygen
Explanation
Magnesium is part of the chlorophyll molecule, so its deficiency reduces chlorophyll formation and produces yellowing, called chlorosis, especially in older leaves. Iron deficiency can also cause chlorosis, so option b may be chosen, but magnesium is the mineral directly present at the centre of chlorophyll.
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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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