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Q51
(NDA-II/2016)
Science & Technology › Basic Science (Physics, Chemistry, Biology) › Plant anatomy physiology
Answer Verified
A plant having yellow leaves with dead spots has the deficiency of
Result
Your answer:
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·
Correct:
A
Explanation
The correct answer is Option 1: Potassium.
Potassium (K) is a vital macronutrient responsible for osmoregulation and enzyme activation. Its deficiency typically manifests as chlorosis (yellowing of leaves), specifically starting at the margins and tips, followed by the appearance of necrotic (dead) spots. Since potassium is mobile, these symptoms appear first in older leaves as the plant translocates the nutrient to younger tissues.
- Magnesium (Option 2): Deficiency causes interveinal chlorosis, but characteristic "dead spots" are more synonymous with potassium or calcium issues.
- Nitrate (Option 3): Nitrogen deficiency leads to general yellowing (uniform chlorosis) of the entire leaf rather than localized dead spots.
- Phosphate (Option 4): Deficiency usually results in dark green or purple/anthocyanin coloration and stunted growth, not yellowing with necrotic spots.
Therefore, the combination of yellowing and distinct necrotic spotting is a classic diagnostic symptom of Potassium deficiency.
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