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B
Nageli
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C
Hofmeister
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D
Schmidt
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Solution
The correct option is B Schmidt The tunica-corpus theory was proposed by a German scientist A. Schmidt in 1924. The theory includes that the shoot apex can be differentiated into two major regions corpus and tunica. Corpus is a central core, with large cells dividing irregularly to result in volume growth. It is surrounded by an outer enveloping layer the tunica. The tunica may be single or multilayered. It