A) फेलोजन
B) वैस्कुलर कैम्बियम
C) शीर्षकल्प
D) अक्षीय कल्प
सही उत्तर: B
वैस्कुलर कैम्बियम एक प्रकार की पार्श्व कल्प है जो द्विबीजपत्री तनों में द्वितीयक जाइलम (लकड़ी) और द्वितीयक फ्लोएम का उत्पादन करती है। यह प्रक्रिया द्वितीयक वृद्धि के दौरान तने की मोटाई बढ़ाने में योगदान देती है।
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