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एक उपयुक्त विधि द्वारा पाइप के तने को आरपार काटकर कर रस की कुछ बूंदें एकत्रित की । रस का रासायनिक परीक्षण किया गया। निम्नलिखित में से कौनसा परिणाम यह दर्शायेगा कि यह एक फ्लोएम रस है- 

(a) शर्करा की अनुपस्थिति

(b) अम्लीय 

(c) क्षारीय

(d) निम्न अपवर्तनांक

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