Q.12
ICAR AIEEA PG Agronomy 09 July 2023 (Shift 1) Paper
MCQ (Single Correct) +4 −1
English हिन्दी
A lack of micronutrients affects not only plant growth but also vital functions, such as photosynthetic and mitochondrial electron flow.

Which of the following group of elements shall have the greatest impact on both photosynthetic and mitochondrial electron transport?

सूक्ष्म पोषक तत्वों की कमी न केवल पौधों की वृद्धि को बल्कि प्रकाश संश्लेषी और माइटोकॉन्ड्रियल इलेक्ट्रॉन प्रवाह जैसे महत्वपूर्ण कार्यों को भी प्रभावित करती है। निम्नलिखित में से किस तत्व समूह का प्रकाश संश्लेषी और माइटोकॉन्ड्रियल इलेक्ट्रॉन परिवहन दोनों पर सबसे अधिक प्रभाव पड़ेगा?
EXPLANATION Secondary and Micronutrients in Soils: Calcium, Magnesium, Sulfur, Zinc, Iron, Manganese, Copper, Boron
  • Iron (Fe): Essential component of cytochromes, iron-sulfur ($Fe-S$) clusters in both mitochondrial Complexes I, II, III and chloroplastic Ferredoxin / Photosystem I.
  • Copper (Cu): Core redox center of plastocyanin in photosynthetic light reactions and of cytochrome c oxidase (Complex IV) in mitochondrial respiration.
  • Manganese (Mn): Vital component of the oxygen-evolving complex ($Mn_4CaO_5$ cluster) in Photosystem II and of mitochondrial manganese superoxide dismutase (Mn-SOD).
  • Therefore, the triad of redox transition metals Cu, Mn, and Fe governs both mitochondrial and photosynthetic electron transport chains, confirming Option 4.
  • लोहा (Fe): माइटोकॉन्ड्रिया के कॉम्प्लेक्स I, II, III के साइटोक्रोम व Fe-S क्लस्टर तथा क्लोरोप्लास्ट के फेरेडॉक्सिन व पीएस-I का मुख्य घटक है।
  • तांबा (Cu): प्रकाश-संश्लेषण में प्लास्टोसायनिन तथा श्वसन में साइटोक्रोम सी ऑक्सीडेज (कॉम्प्लेक्स IV) का प्रमुख रेडॉक्स केंद्र है।
  • मैंगनीज (Mn): फोटोसिस्टम II में जल के प्रकाशीय अपघटन (OEC) तथा माइटोकॉन्ड्रियल Mn-SOD का अनिवार्य घटक है।
  • अतः Cu, Mn और Fe का समूह दोनों इलेक्ट्रॉन परिवहन तंत्रों को सर्वाधिक प्रभावित करता है (विकल्प 4 सही है)।
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Agronomy विषय एवं अध्याय

विषय एवं पाठ्यक्रम के अनुसार सभी अध्याय देखें

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6 टॉपिक्स
Plant Physiology, Photosynthesis, Transpiration and Abiotic Stresses in Crops Historical Milestones, Agricultural Education, ICAR Institutes and Research Infrastructure Genetics, Cytogenetics, Plant Breeding Methods and Varietal Improvement Crop Protection: Major Diseases, Insect Pests and Integrated Plant Health Management Agricultural Statistics, Probability Distributions and Experimental Field Designs (CRD, RBD, SPD) Agricultural Extension, Rural Development Programs and Technology Transfer (KVK, ATMA)

सस्य विज्ञान के सिद्धांत, फसल पारिस्थितिकी, कृषि भूगोल एवं कृषि मौसम विज्ञान

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प्रमुख क्षेत्रीय फसलों का सस्य विज्ञान

9 टॉपिक्स
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खरपतवार प्रबंधन एवं नियंत्रण

9 टॉपिक्स
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5 टॉपिक्स
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7 टॉपिक्स
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शुष्क भूमि सस्य विज्ञान एवं जलसंभर प्रबंधन

3 टॉपिक्स
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समस्याग्रस्त मृदाएं, सुधार एवं फसल उत्पादन

2 टॉपिक्स
Salt-Affected Soils: Saline, Sodic, Saline-Sodic Soils, Diagnostics (ECe, ESP, SAR, pH) and Chemical Reclamation Acid, Acid-Sulfate, Calcareous and Degraded Problem Soils: Liming, Amelioration and Crop Adaptation

टिकाऊ भूमि उपयोग प्रणालियां एवं संरक्षण कृषि

3 टॉपिक्स
Agroforestry Systems, Farming Systems Research (FSR), Integrated Farming Systems (IFS) and Wasteland Management Conservation Agriculture: Principles, Minimum Tillage, Zero Tillage, Bed Planting and Crop Residue Retention Organic Farming, Natural Farming (ZBNF), Certification Standards and Organic Inputs Preparation
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