Q18: Which of the following pairs related to nutrient deficiency symptoms... - Soil Science & Agricultural Chemistry - RPSC Assistant Agriculture Officer 2018

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Which of the following pairs related to nutrient deficiency symptoms is not correctly matched?

निम्नलिखित में से पोषक तत्त्वों के कमी के लक्षण से सम्बन्धित कौन सा युग्म सही नहीं है?

Ca - Deficiency symptoms appear on terminal bud and it dries with time. कैल्सियम - कमी के लक्षण अन्तिम कलिका पर प्रदर्शित होते हैं जो कि समय के साथ सूख जाती है। S - Chlorosis symptoms appear on younger leaves गंधक - युवा पत्तियों पर पीलापन प्रदर्शित होता है। Fe - Chlorosis symptoms appear on older leaves लौह - पुरानी पत्तियों पर पीलापन प्रदर्शित होता है। N - Chlorosis symptoms appear on older leaves नत्रजन - पुरानी पत्तियों पर पीलापन प्रदर्शित होता है।

Iron (Fe) is an immobile nutrient within plant tissues and cannot be translocated from older tissues to growing points.
Consequently, iron deficiency symptoms (interveinal chlorosis) appear first on younger (top) leaves, whereas older leaves remain green; stating that iron deficiency appears on older leaves is incorrect.
Calcium (Ca) and Boron (B) are completely immobile; deficiency symptoms appear at terminal buds/growing tips leading to dieback.
Nitrogen (N) is highly mobile in plants; deficiency causes chlorosis on older (lower) leaves first as N mobilizes to newer leaves.

लौह (Fe) पौधे में अत्यधिक अचल (Immobile) पोषक तत्त्व है, जो पुरानी पत्तियों से नई पत्तियों की ओर स्थानांतरित नहीं हो पाता।
इसलिए लौह की कमी के लक्षण (अंतःशिरीय हरिमहीनता / Interveinal chlorosis) सर्वप्रथम 'नई/शीर्ष पत्तियों' पर प्रकट होते हैं, पुरानी पत्तियों पर नहीं। अतः विकल्प (3) गलत युग्म है।
कैल्सियम (Ca) की कमी के लक्षण सबसे ऊपरी शीर्ष कलिका पर दिखाई देते हैं तथा कलिका सूख जाती है।
नत्रजन (N) पौधे में अत्यधिक गतिशील होता है, अतः इसकी कमी के लक्षण सर्वप्रथम पुरानी निचली पत्तियों पर प्रकट होते हैं।

Explanation not matching this question? क्या व्याख्या इस प्रश्न से मेल नहीं खा रही? Report Mismatch त्रुटि बताएं

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Q18: Which of the following pairs related to nutrient deficiency symptoms... - Soil Science & Agricultural Chemistry - RPSC Assistant Agriculture Officer 2018 | Agrigyan

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