2
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : The primary cause of graft incompatibility in interspecific Cucurbita sp is the occurrence of hormonal
imbalances between auxin and ethylene, in the root system followed by tissue disintegration
Reason (R) : The basipetal flow of excess auxin at graft union block the formation of ethylene, consequently leading to
cellular juvenility.
In light of the above statements, choose the correct answer from the options given below.
EXPLANATION
Maturity Standards, Respiration Kinetics & Wa
- Assertion (A): In vegetable grafting (such as watermelon, melon, or cucumber grafted onto interspecific Cucurbita rootstocks like C. moschata $\times$ C. maxima), delayed graft incompatibility often stems from hormonal dysregulation between auxin transport and ethylene synthesis, triggering cambial failure and vascular necrosis. (True).
- Reason (R): The accumulation of basipetally transported auxin above the incompatible graft union actively stimulates ACC synthase, inducing a massive surge of ethylene production that accelerates cellular senescence, lignification failure, and abscission; it does not block ethylene or cause juvenility. (False).
- Conclusion: Assertion (A) is true but Reason (R) is false.
- Correct Option: Option 3 ((A) is true but (R) is false).
Explanation not matching this question?
क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?
Report
Want to practice this paper in exam conditions?
क्या आप परीक्षा जैसे माहौल में अभ्यास करना चाहते हैं?
Test yourself in 5-question batch format with timer and hidden answers.
5-प्रश्नों के बैच फॉर्मैट, टाइमर और छिपे उत्तरों के साथ खुद को परखें।
Start Practice Mode →
प्रैक्टिस टेस्ट मोड शुरू करें →