The growth regulator that stimulates cell elongation is: | Agrigyan

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Q.1

RPSC Agriculture Officer 2011 (Q.20)

MCQ (Single Correct) +3 −1

The growth regulator that stimulates cell elongation is:

कौन-सा वृद्धि नियामक कोशिका लम्बाई बढ़ाने को उत्प्रेरित करता है?

Ethylene ईथलीन Abscissic acid एब्सिसिक अम्ल Cytokinin साइटोकाइनिन Auxin ऑग्ज़ीन

Q.2

RPSC Agriculture Officer 2011 (Q.32)

MCQ (Single Correct) +3 −1

Spraying of kaoline reduces transpiration from leaf surface by:

केओलीन के छिड़काव से पत्ती की सतह से वाष्पोत्सर्जन में कमी इस लिये होती है:

Stomatal closure रन्ध्र बन्द होने से Forming a film परत बनने से Increased reflectance प्रतिबिम्बन वृद्धि से Increased hydration जलयोजन में वृद्धि से

Analysis of antitranspirant action:

Stomatal closure: Stomatal closing chemicals include phenylmercuric acetate (PMA) and abscisic acid (ABA).
Forming a film: Selected as the correct answer in the official RPSC answer key, referring to the protective physical barrier/coating formed over the leaf surface.
Increased reflectance: Kaolin (5% suspension) is scientifically categorized as a reflecting material that reflects solar radiation to lower leaf temperature, though option (B) is the official key response.
Increased hydration: Not an antitranspirant mechanism.

वाष्पोत्सर्जन रोधी (Antitranspirant) क्रिया का विश्लेषण:

रन्ध्र बन्द होने से: पीएमए (PMA) तथा एब्सिसिक अम्ल (ABA) रंध्र बंद करने वाले रसायन हैं।
परत बनने से: आरपीएससी की आधिकारिक उत्तर कुंजी के अनुसार पत्ती की सतह पर सुरक्षात्मक परत (Film) बन जाने से वाष्पोत्सर्जन घटता है।
प्रतिबिम्बन वृद्धि से: वैज्ञानिक रूप से केओलीन परावर्तक प्रकार का रसायन है जो प्रकाश परावर्तित करता है, परंतु आधिकारिक कुंजी में विकल्प (B) मान्य किया गया है।
जलयोजन में वृद्धि से: यह वाष्पोत्सर्जन रोधी तंत्र नहीं है।

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

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