- A Phosphorus and nitrogen deficiency are sometimes thought to produce visually identical symptoms across most plant species
- B P deficiency often causes purple/red coloration (anthocyanin accumulation) due to sugar buildup; N deficiency causes chlorosis
- C P deficiency sometimes causes scorched, browning leaf tips; N deficiency sometimes causes interveinal yellowing of leaves
- D P deficiency is sometimes thought to be limited mainly to the root system; N deficiency mainly affects mature leaves
Correct answer: B. P deficiency often causes purple/red coloration (anthocyanin accumulation) due to sugar buildup; N deficiency causes chlorosis
Explanation: Phosphorus deficiency causes accumulation of sugars (P is needed for sugar metabolism/export) which promotes anthocyanin pigment synthesis, giving purple or bronze coloration. N deficiency causes yellow-green chlorosis starting in oldest leaves.
Concept context
Essential mineral elements, their roles and deficiency symptoms. Nitrogen fixation and soil nutrition.